POSC Specifications
Version 3.0
Epicentre Standard Values
well_log_trace_class

well_log_trace_class

Standard Instance Values

identifier description naming _system parent _class source status version
    naming _system .identifier well _log _trace _class .identifier     ref _version .identifier
logging while drilling Logging measurements taken while drilling the well with tools which are an integral part of the drill string. POSC well log acquisition type   POSC provisional epicentre 2.2
wireline Logging measurements taken using well logging tools conveyed on wireline. POSC well log acquisition type   POSC provisional epicentre 2.2
drill pipe conveyed Logging measurements taken using well logging tools attached to the end of the drill pipe. Usually the tools are wireline tools with special equipment to attach them to the drill pipe while still allowing the tools to be attached to a wireline. Generally used in highly deviated wells. POSC well log acquisition type   POSC provisional epicentre 2.2
well log trace The trace being classified is a well log trace POSC well log trace classes   POSC provisional epicentre 3.0
area A particular extent of space or surface. POSC well log trace classes   POSC provisional epicentre 2.2
resistivity The property measuring the resistance to flow of an electrical current. POSC well log trace classes   POSC provisional epicentre 2.2
resistivity from attenuation Resistivity calculated from the attenuation of an electromagnetic wave. Generally recorded from a LWD resistivity tool. POSC well log trace classes   POSC provisional epicentre 2.2
conductivity from attenuation Conductivity calculated from the attenuation of an electromagnetic wave. Generally recorded from a LWD resistivity tool. POSC well log trace classes   POSC provisional epicentre 2.2
resistivity from phase shift Resistivity calculated from the phase shift of an electromagnetic wave. Generally recorded from a LWD resistivity tool. POSC well log trace classes   POSC provisional epicentre 2.2
conductivity from phase shift Conductivity calculated from the phase shift of an electromagnetic wave. Generally recorded from a LWD resistivity tool. POSC well log trace classes   POSC provisional epicentre 2.2
electric current The flow of electric charge. POSC well log trace classes   POSC provisional epicentre 2.2
spontaneous potential The difference in potential (DC Voltage) between a moveable electrode in the borehole and a distant reference electrode usually at the surface. POSC well log trace classes   POSC provisional epicentre 2.2
volume cubic capacity POSC well log trace classes   POSC provisional epicentre 2.2
velocity directional speed POSC well log trace classes   POSC provisional epicentre 2.2
tracer survey A well log used for the purpose of monitoring a traceable material; e.g. a radioactive isotope. POSC well log trace classes   POSC provisional epicentre 2.2
time A measured or measurable period. POSC well log trace classes   POSC provisional epicentre 2.2
sampling To take a sample of or from something. POSC well log trace classes   POSC provisional epicentre 2.2
salinity The concentration of ions in solution. POSC well log trace classes   POSC provisional epicentre 2.2
quality Degree of excellence. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
pressure The force or thrust exerted upon a surface divided by the area of the surface. POSC well log trace classes   POSC provisional epicentre 2.2
plane angle An angle formed by two intersecting lines. POSC well log trace classes   POSC provisional epicentre 2.2
phase shift A change or variation according to a harmonic law from a standard position or instant of starting. POSC well log trace classes   POSC provisional epicentre 2.2
resistivity phase shift The amount of change in the phase of an electrical wave. POSC well log trace classes phase shift POSC provisional epicentre 2.2
high frequency E-M phase shift The amount of change in the phase of a high frequency electromagnetic wave. POSC well log trace classes phase shift POSC provisional epicentre 2.2
perforating The procedure for introducing holes through casing into a formation so that formation fluids can enter into the casing. POSC well log trace classes   POSC provisional epicentre 2.2
length A measured distance or dimension. POSC well log trace classes   POSC provisional epicentre 2.2
interpretation variable A variable in a well log interpretation equation. POSC well log trace classes   POSC provisional epicentre 2.2
image The likeness of an object produced by an electrical device. POSC well log trace classes   POSC provisional epicentre 2.2
gradiomanometer The measurement of the average density of fluids in a wellbore. POSC well log trace classes   POSC provisional epicentre 2.2
force Energy excerted or brought to bear. POSC well log trace classes   POSC provisional epicentre 2.2
tension The tension on the wireline cable while logging. POSC well log trace classes force POSC provisional epicentre 2.2
fluid viscosity The amount of a fluid resistance to flow. POSC well log trace classes   POSC provisional epicentre 2.2
acoustic velocity The velocity of an acoustic wave. POSC well log trace classes   POSC provisional epicentre 2.2
fluid velocity The velocity of a flowing fluid. POSC well log trace classes   POSC provisional epicentre 2.2
fluid density The quantity per unit volume of fluid. POSC well log trace classes   POSC provisional epicentre 2.2
flowmeter A logging tool to measure the rate and/or direction of fluid flow in a wellbore. POSC well log trace classes   POSC provisional epicentre 2.2
electric potential The difference in electrical energy between two systems. POSC well log trace classes   POSC provisional epicentre 2.2
dipmeter Any of a number of measurements produced by a tool designed to measure formation dip and borehole characteristics through direct and indirect measurements. POSC well log trace classes   POSC provisional epicentre 2.2
dielectric Relative permittivity. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
cement evaluation Any of the measurements made to determine the presence and quality of the cement bond to casing or to formation. POSC well log trace classes   POSC provisional epicentre 2.2
casing inspection Any of the measurements made for the purpose of determing the properties of the well casing. POSC well log trace classes   POSC provisional epicentre 2.2
bulk compressibility The relative compressiblity of a material. POSC well log trace classes   POSC provisional epicentre 2.2
auxiliary A general classification for measurements which are very specialized and not normally accessed by petrophysicists. POSC well log trace classes   POSC provisional epicentre 2.2
acoustic impedance Seismic velocity multiplied by density. POSC well log trace classes   POSC provisional epicentre 2.2
acceleration Output from an accelerometer on a logging tool. POSC well log trace classes   POSC provisional epicentre 2.2
ratio A relationship between two values usually expressed as a fraction. POSC well log trace classes   POSC provisional epicentre 2.2
amplitude ratio The ratio of two amplitudes. POSC well log trace classes   POSC provisional epicentre 2.2
count rate ratio The ratio of two count rates. POSC well log trace classes   POSC provisional epicentre 2.2
elemental ratio The ratio of two different elemental measurements; e.g. K/U. POSC well log trace classes   POSC provisional epicentre 2.2
C/O ratio The ratio of the Carbon measurement to the Oxygen measurement. POSC well log trace classes   POSC provisional epicentre 2.2
Th/K ratio The ratio of the Thorium measurment to the Potassium measurment. POSC well log trace classes   POSC provisional epicentre 2.2
resistivity ratio The ratio of two resistivity values. POSC well log trace classes   POSC provisional epicentre 2.2
sigma The macroscopic capture cross section, i.e. the effective cross-sectional area per unit volume for the capture of neutrons. POSC well log trace classes   POSC provisional epicentre 2.2
sigma water The macroscopic capture cross section, i.e. the effective cross-sectional area per unit volume, of water for the capture of neutrons. POSC well log trace classes sigma POSC provisional epicentre 2.2
sigma matrix The macroscopic capture cross section, i.e. the effective cross-sectional area per unit volume, of the rock matrix for the capture of neutrons. POSC well log trace classes sigma POSC provisional epicentre 2.2
sigma formation The macroscopic capture cross section, i.e. the effective cross-sectional area per unit volume, of the formation for the capture of neutrons. POSC well log trace classes sigma POSC provisional epicentre 2.2
sigma hydrocarbon The macroscopic capture cross section, i.e. the effective cross-sectional area per unit volume, of hydrocarbon for the capture of neutrons. POSC well log trace classes sigma POSC provisional epicentre 2.2
sigma oil The macroscopic capture cross section, i.e. the effective cross-sectional area per unit volume, of oil for the capture of neutrons. POSC well log trace classes   POSC provisional epicentre 2.2
sigma gas The macroscopic capture cross section, i.e. the effective cross-sectional area per unit volume, of gas for the capture of neutrons. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
decay time The time it takes for a population to decay, generally expressed as a half life. POSC well log trace classes   POSC provisional epicentre 2.2
neutron die away time The time it takes for a neutron population to die away to half value. POSC well log trace classes   POSC provisional epicentre 2.2
nuclear magnetic decay time The decay time of a nuclear magnetic signal. POSC well log trace classes   POSC provisional epicentre 2.2
casing collar locator The signal measured by a device at the location of casing collars and other features (e.g., perforations). POSC well log trace classes   POSC provisional epicentre 2.2
magnetic casing collar locator The signal measured by a magnetic device at the location of casing collars and other features (e.g., perforations). POSC well log trace classes casing collar locator POSC provisional epicentre 2.2
mechanical casing collar locator The signal measured by a mechanical device at the location of casing collars and other features (e.g., perforations). POSC well log trace classes casing collar locator POSC provisional epicentre 2.2
acoustic casing collar locator The signal measured by an acoustic device at the location of casing collars and other features (e.g., perforations). POSC well log trace classes casing collar locator POSC provisional epicentre 2.2
high frequency electromagnetic High frequency electromagnetic measurements, e.g. from a dielectric logging tool. POSC well log trace classes   POSC provisional epicentre 2.2
temperature A temperature measurement. POSC well log trace classes   POSC provisional epicentre 2.2
bit size The diameter of the drill bit used to drill the hole. POSC well log trace classes   POSC provisional epicentre 2.2
count rate The rate of occurences; e.g. the far counts from a density tool.. POSC well log trace classes   POSC provisional epicentre 2.2
photoelectric absorption The effect measured by the density log and produced by the process of a photon colliding with an atom, and then being completely absorbed and its total energy used to eject one of the orbital electrons from those surrounding the nucleus. POSC well log trace classes   POSC provisional epicentre 2.2
photoelectric absorption correction The correction that is to be made to the photoelectric absorption curve. POSC well log trace classes   POSC provisional epicentre 2.2
element The elemental composition, generally in weight percent, of a formation as calculated from information obtained from a geochemical logging pass; e.g., weight percent of Al, Si, Ca, Fe, etc. POSC well log trace classes   POSC provisional epicentre 2.2
permeability The permeability of the surrounding formation. POSC well log trace classes   POSC provisional epicentre 2.2
nuclear magnetism log permeability The permeability derived from a nuclear magnetism log. POSC well log trace classes permeability POSC provisional epicentre 2.2
core permeability The permeability derived from a core. POSC well log trace classes permeability POSC provisional epicentre 2.2
log derived permeability The permeability derived from a well log. POSC well log trace classes permeability POSC provisional epicentre 2.2
depth The distance to a point in a wellbore. POSC well log trace classes   POSC provisional epicentre 2.2
true vertical depth The distance along a straight, vertical path. Usually computed from a measured depth and deviation information. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
measured depth The distance measured along the path of a wellbore. POSC well log trace classes   POSC provisional epicentre 2.2
depth derived from velocity The depth calculated from velocity information. POSC well log trace classes   POSC provisional epicentre 2.2
bulk volume A quantity per unit volume. POSC well log trace classes   POSC provisional epicentre 2.2
bulk volume water The quantity of formation water present in a unit volume of rock. The product of water saturation and total porosity. POSC well log trace classes   POSC provisional epicentre 2.2
bulk volume hydrocarbon The quantity of hydrocarbon present in a unit volume of rock. The product of hydrocarbon saturation and total porosity. POSC well log trace classes   POSC provisional epicentre 2.2
bulk volume oil The quantity of oil present in a unit volume of rock. The product of oil saturation and total porosity. POSC well log trace classes   POSC provisional epicentre 2.2
bulk volume gas The quantity of gas present in a unit volume of rock. The product of gas saturation and total porosity. POSC well log trace classes   POSC provisional epicentre 2.2
caliper A well log used to record hole diameter (open or cased). POSC well log trace classes   POSC provisional epicentre 2.2
mechanical caliper A well log which uses a mechanical device to measure hole diameter. POSC well log trace classes   POSC provisional epicentre 2.2
acoustic caliper A well log which uses an acoustic device to measure hole diameter. POSC well log trace classes   POSC provisional epicentre 2.2
nuclear caliper A well log which uses a nuclear device to measure hole diameter. POSC well log trace classes   POSC provisional epicentre 2.2
azimuth In the horizontal plane, it is the clockwise angle of departure from magnetic north (while looking down hole). POSC well log trace classes   POSC provisional epicentre 2.2
relative bearing While looking down hole, it is the clockwise angle from the upper side of the sonde to the reference pad or electrode. POSC well log trace classes   POSC provisional epicentre 2.2
deviation Departure of a borehole from vertical. Also, the angle measured between the tool axis and vertical. POSC well log trace classes   POSC provisional epicentre 2.2
dip The angle that a sturctural surface, e.g. a bedding or fault plane, makes with the horizontal, measured perpendicular to the strike of the structure. POSC well log trace classes   POSC provisional epicentre 2.2
amplitude Any measurement of the maximum departure of a wave from an average value. POSC well log trace classes   POSC provisional epicentre 2.2
amplitude of acoustic wave The extent of departure of an acoustic wave measured from the mean position. POSC well log trace classes   POSC provisional epicentre 2.2
amplitude of E-M wave The extent of departure of an electromagnetic wave measured from the mean position. POSC well log trace classes   POSC provisional epicentre 2.2
attenuation The amount of reduction in the amplitude of a wave. POSC well log trace classes   POSC provisional epicentre 2.2
attenuation of acoustic wave The amount of reduction in the amplitude of an acoustic wave. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
attenuation of E-M wave The amount of reduction in the amplitude of an electromagnetic wave. POSC well log trace classes   POSC provisional epicentre 2.2
saturation The fraction or percentage of the pore volume of a rock. POSC well log trace classes   POSC provisional epicentre 2.2
water saturation The fraction or percentage of pore volume of rock occupied by water. POSC well log trace classes   POSC provisional epicentre 2.2
hydrocarbon saturation The fraction or percentage of pore volume of rock occupied by hydrocarbon. POSC well log trace classes   POSC provisional epicentre 2.2
gas saturation The fraction or percentage of pore volume of rock occupied by gas. POSC well log trace classes   POSC provisional epicentre 2.2
oil saturation The fraction or percentage of pore volume of rock occupied by oil. POSC well log trace classes   POSC provisional epicentre 2.2
flushed zone saturation The fraction or percentage of pore volume of rock occupied by drilling mud or mud filtrate in the flushed zone. POSC well log trace classes   POSC provisional epicentre 2.2
free fluid index The percent of the bulk volume occupied by fluids which are free to flow as measured by the nuclear magnetism log. POSC well log trace classes   POSC provisional epicentre 2.2
gamma ray The measurement of naturally occurring Gamma Ray radiation being released by radioisotopes in clay or other minerals in the formation. POSC well log trace classes   POSC provisional epicentre 2.2
total gamma ray The measurement of all the naturally occurring gamma radiation. POSC well log trace classes   POSC provisional epicentre 2.2
spectral gamma ray The measurement of all the naturally occurring gamma radiation separated by energy windows. POSC well log trace classes   POSC provisional epicentre 2.2
potassium The measurement of gamma radiation emitted by potassium. POSC well log trace classes   POSC provisional epicentre 2.2
thorium The measurement of gamma radiation emitted by thorium. POSC well log trace classes   POSC provisional epicentre 2.2
uranium The measurement of gamma radiation emitted by urnaium. POSC well log trace classes   POSC provisional epicentre 2.2
gamma ray minus uranium The measurement of the naturally occurring gamma radiation less the radiation attributed to uranium. POSC well log trace classes   POSC provisional epicentre 2.2
mineral The mineral composition, generally in weight percent, of a formation as calculated from elemental information obtained from a geochemical logging pass; e.g., weight percent of dolomite, calcite, illite, quartzite, etc. POSC well log trace classes   POSC provisional epicentre 2.2
travel time The time it takes for an acoustic or electromagnetic wave to traverse a specific distance. POSC well log trace classes   POSC provisional epicentre 2.2
acoustic wave travel time The time it takes for an acoustic wave to traverse a fixed distance. POSC well log trace classes   POSC provisional epicentre 2.2
compressional wave travel time The time it takes for a compressional acoustic wave to traverse a fixed distance. POSC well log trace classes   POSC provisional epicentre 2.2
shear wave travel time The time it takes for a shear acoustic wave to traverse a fixed distance. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
tube wave travel time The time it takes for a tube acoustic wave to traverse a fixed distance. POSC well log trace classes   POSC provisional epicentre 2.2
electromagnetic wave travel time The time it takes for an electromagnetic wave to traverse a fixed distance. POSC well log trace classes   POSC provisional epicentre 2.2
matrix travel time The time it takes for an electromagnetic or acoustic wave to traverse a fixed distance of a given material or matrix. In this case the material or matrix is a specific, zero porosity rock, e.g. sandstone, limestone or dolomite. POSC well log trace classes   POSC provisional epicentre 2.2
electromagnetic wave matrix travel time The time it takes for an electromagnetic wave to traverse a fixed distance of a given material or matrix. In this case the material or matrix is a specific, zero porosity rock, e.g. sandstone, limestone or dolomite. POSC well log trace classes   POSC provisional epicentre 2.2
acoustic wave matrix travel time The time it takes for an acoustic wave to traverse a fixed distance of a given material or matrix. In this case the material or matrix is a specific, zero porosity rock, e.g. sandstone, limestone or dolomite. POSC well log trace classes   POSC provisional epicentre 2.2
compressional wave matrix travel time The time it takes for a compressional acoustic wave to traverse a fixed distance of a given material or matrix. In this case the material or matrix is a specific, zero porosity rock, e.g. sandstone, limestone or dolomite. POSC well log trace classes   POSC provisional epicentre 2.2
shear wave matrix travel time The time it takes for a shear acoustic wave to traverse a fixed distance of a given material or matrix. In this case the material or matrix is a specific, zero porosity rock, e.g. sandstone, limestone or dolomite. POSC well log trace classes   POSC provisional epicentre 2.2
tube wave matrix travel time The time it takes for a acoustic tube wave to traverse a fixed distance of a given material or matrix. In this case the material or matrix is a specific, zero porosity rock, e.g. sandstone, limestone or dolomite. POSC well log trace classes   POSC provisional epicentre 2.2
density Mass per unit Volume - well logging units are usually gm/cc. POSC well log trace classes   POSC provisional epicentre 2.2
bulk density The measured density of a rock with the pore volume filled with fluid. The pore fluid is generally assumed to be water. POSC well log trace classes   POSC provisional epicentre 2.2
matrix density The density of a rock matrix. In this case, the matrix is assumed to have zero porosity. POSC well log trace classes   POSC provisional epicentre 2.2
log matrix density The density of a rock matrix used with, or derived from, the bulk density from a well log. The matrix is assumed to have zero porosity. POSC well log trace classes   POSC provisional epicentre 2.2
core matrix density The density of a rock matrix measured on a core sample. POSC well log trace classes   POSC provisional epicentre 2.2
porosity The total pore volume occupied by fluid in a rock. Includes isolated nonconnecting pores and volume occupied by absorbed, immobile fluid. POSC well log trace classes   POSC provisional epicentre 2.2
high frequency electromagnetic porosity Porosity calculated using a high frequency electromagnetic measurement as input. POSC well log trace classes   POSC provisional epicentre 2.2
core porosity Porosity from a core measurement. POSC well log trace classes   POSC provisional epicentre 2.2
conventional core porosity Porosity from a measurement made on a conventional core. POSC well log trace classes   POSC provisional epicentre 2.2
sidewall core porosity Porosity from a measurement made on a sidewall core. POSC well log trace classes   POSC provisional epicentre 2.2
nuclear magnetism porosity Porosity calculated using the measurements from a nuclear magnetismlogging pass. POSC well log trace classes   POSC provisional epicentre 2.2
total porosity The total pore volume occupied by fluid in a rock. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
effective porosity The interconnected pore volume occupied by free fluids. POSC well log trace classes   POSC provisional epicentre 2.2
cross plot porosity The pore volume of a rock calculated from cross plotting two or more well log porosity measurements. POSC well log trace classes   POSC provisional epicentre 2.2
average porosity The pore volume of a rock averaged using various well log or core porosity measurements. POSC well log trace classes   POSC provisional epicentre 2.2
density porosity Porosity calculated using the bulk density measurement from a density log. POSC well log trace classes   POSC provisional epicentre 2.2
limestone density porosity Porosity calculated from the bulk density measurement of a density log using a limestone matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
OH limestone density porosity Porosity calculated from the bulk density measurement of an open hole density log using a limestone matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
CH limestone density porosity Porosity calculated from the bulk density measurement of a cased hole density log using a limestone matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
sandstone density porosity Porosity calculated from the bulk density measurement of a density log using a sandstone matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
OH sandstone density porosity Porosity calculated from the bulk density measurement of an open hole density log using a sandstone matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
CH sandstone density porosity Porosity calculated from the bulk density measurement of a cased hole density log using a sandstone matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
dolomite density porosity Porosity calculated from the bulk density measurement of a density log using a dolomite matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
OH dolomite density porosity Porosity calculated from the bulk density measurement of an open hole density log using a dolomite matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
CH dolomite density porosity Porosity calculated from the bulk density measurement of a cased holedensity log using a dolomite matrix density. POSC well log trace classes   POSC provisional epicentre 2.2
neutron porosity Porosity from a neutron log. POSC well log trace classes   POSC provisional epicentre 2.2
limestone neutron porosity Porosity calculated from a neutron log using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH limestone neutron porosity Porosity calculated from an open hole neutron log using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH limestone neutron porosity Porosity calculated from a cased hole neutron log using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
sandstone neutron porosity Porosity calculated from a neutron log using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH sandstone neutron porosity Porosity calculated from an open hole neutron log using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH sandstone neutron porosity Porosity calculated from an open hole neutron log using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
CH dolomite neutron porosity Porosity calculated from a cased hole neutron log using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH dolomite neutron porosity Porosity calculated from an open hole neutron log using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
dolomite neutron porosity Porosity calculated from a neutron log using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
pulsed neutron porosity Porosity calculated from a pulsed neutron log. POSC well log trace classes   POSC provisional epicentre 2.2
acoustic porosity Porosity calculated from an acoustic log. POSC well log trace classes   POSC provisional epicentre 2.2
limestone acoustic porosity Porosity calculated from an acoustic log using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
compressional wave limestone porosity Porosity calculated from a compressional wave acoustic log using a limestone matrix POSC well log trace classes   POSC provisional epicentre 2.2
OH compressional wave limestone porosity Porosity calculated from a compressional wave acquired in an open hole using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH compressional wave limestone porosity Porosity calculated from a compressional wave acquired in a cased hole using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
shear wave limestone porosity Porosity calculated from a shear wave acoustic log using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH shear wave limestone porosity Porosity calculated from a shear wave acquired in an open hole using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH shear wave limestone porosity Porosity calculated from a shear wave acquired in a cased hole using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
tube wave limestone porosity Porosity calculated from a tube wave acoustic log using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH tube wave limestone porosity Porosity calculated from a tube wave acquired in an open hole using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH tube wave limestone porosity Porosity calculated from a tube wave acquired in a cased hole using a limestone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
sandstone acoustic porosity Porosity calculated from an acoustic log using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
compressional wave sandstone porosity Porosity calculated from a compressional wave acoustic log using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH compressional wave sandstone porosity Porosity calculated from a compressional wave acquired in an open hole using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH compressional wave sandstone porosity Porosity calculated from a compressional wave acquired in a cased hole using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
shear wave sandstone porosity Porosity calculated from a shear wave acoustic log using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
OH shear wave sandstone porosity Porosity calculated from a shear wave acquired in an open hole using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH shear wave sandstone porosity Porosity calculated from a shear wave acquired in a cased hole using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
tube wave sandstone porosity Porosity calculated from a tube wave acoustic log using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH tube wave sandstone porosity Porosity calculated from a tube wave acquired in an open hole using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH tube wave sandstone porosity Porosity calculated from a tube wave acquired in a cased hole using a sandstone matrix. POSC well log trace classes   POSC provisional epicentre 2.2
dolomite acoustic porosity Porosity calculated from an acoustic log using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
compressional wave dolomite porosity Porosity calculated from a compressional wave acoustic log using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH compressional wave dolomite porosity Porosity calculated from a compressional wave acquired in an open hole using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH compressional wave dolomite porosity Porosity calculated from a compressional wave acquired in a cased hole using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
shear wave dolomite porosity Porosity calculated from a shear wave acoustic log using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH shear wave dolomite porosity Porosity calculated from a shear wave acquired in an open hole using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH shear wave dolomite porosity Porosity calculated from a shear wave acquired in a cased hole using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
tube wave dolomite porosity Porosity calculated from a tube wave acoustic log using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
OH tube wave dolomite porosity Porosity calculated from a tube wave acquired in an open hole using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
CH tube wave dolomite porosity Porosity calculated from a tube wave acquired in a cased hole using a dolomite matrix. POSC well log trace classes   POSC provisional epicentre 2.2
true resistivity The resistivity of fluid-filled rock where fluid distributions and saturations are representative of those in the uninvaded, undisturbed part of the formation. POSC well log trace classes   POSC provisional epicentre 2.2
water saturated resistivity The resistivity of rock completely saturated with connate water. POSC well log trace classes   POSC provisional epicentre 2.2
connate water resistivity The resistivity of the water entrapped in the interstices of the rock. POSC well log trace classes   POSC provisional epicentre 2.2
mud resistivity The resistivity of the continuous phase liquid used for the drilling of the well. POSC well log trace classes   POSC provisional epicentre 2.2
mud filtrate resistivity The resistivity of the effluent of the continuous phase liquid of the drillling mud which permeates porous and permeable rock. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
mud cake resistivity The resistivity of the filter cake, the residue deposited on the borehole wall as mud loses filtrate into porous and permeable rock. POSC well log trace classes   POSC provisional epicentre 2.2
flushed zone resistivity The resistivity of the zone immediately behind the mud cake and which is considered to be flushed by mud filtrate, i.e., it is considered to have all mobile formation fluids displaced from it. POSC well log trace classes   POSC provisional epicentre 2.2
high frequency resistivity A measurement of the resistivity of the formation, by a high frequ ency electromagnetic tool, within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
deep resistivity The resistivity which represents a measurement made several feet into the formation; generally considered a measurement of the undisturbed formation. POSC well log trace classes   POSC provisional epicentre 2.2
deep induction resistivity The resistivity, measured by an induction log, which represents a measurement made several feet into the formation; generally considered a measurement of the undisturbed formation. POSC well log trace classes   POSC provisional epicentre 2.2
deep laterolog resistivity The resistivity, measured by a laterolog, which represents a measurement made several feet into the formation; generally considered a measurement of the undisturbed formation. POSC well log trace classes   POSC provisional epicentre 2.2
medium resistivity The resistivity which represents a measurement made approximately two to three feet into the formation; generally considered to measure the formation where it contain fluids which are a mixture of mud filtrate, connate water and possibly hydrocarbons. POSC well log trace classes   POSC provisional epicentre 2.2
medium induction resistivity The resistivity, made by an induction log, which represents a measurement made approximately two to three feet into the formation. POSC well log trace classes   POSC provisional epicentre 2.2
medium laterolog resistivity The resistivity, measured by a laterolog, which represents a measurement made approximately two to three feet into the formation. POSC well log trace classes   POSC provisional epicentre 2.2
shallow resistivity The resistivity which represents a measurement made approximately one to two feet into the formation; generally considered to measure the formation where it contains fluids which are comprised primarily of mud filtrate. POSC well log trace classes   POSC provisional epicentre 2.2
dipmeter resistivity The resistivity, measured by a dipmeter, which represents a measurement made approximately one to two feet into the formation; generally considered to measure the formation where it contains fluids which are comprised primarily of mud filtrate. POSC well log trace classes   POSC provisional epicentre 2.2
shallow induction resistivity The resistivity, measured by an induction log, which represents a measurement made approximately one to two feet into the formation; generally considered to measure the formation where it contains fluids which are comprised primarily of mud filtrate. POSC well log trace classes   POSC provisional epicentre 2.2
shallow laterolog resistivity The resistivity, measured by a laterolog, which represents a measurement made approximately one to two feet into the formation; generally considered to measure the formation where it contains fluids which are comprised primarily of mud filtrate. POSC well log trace classes   POSC provisional epicentre 2.2
spherically focused resistivity The resistivity, measured by a spherically focused log, which represents the resistivity approximately one to two feet into the formation. POSC well log trace classes   POSC provisional epicentre 2.2
micro resistivity A measurement of the resistivity of the formation within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
micro laterolog resistivity A measurement of the resistivity of the formation, by a laterolog, within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
micro normal resistivity A resistivity measurement made by a micro log tool which measures within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
micro inverse resistivity A resistivity measurement made by a micro log tool which measures within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
micro spherically focused resistivity A measurement of the resistivity of the formation, by a spherically focused tool, within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
conductivity The property of a medium (solid or fluid) which allows the medium to conduct a form of energy; e.g., electrical conductivity or thermal conductivity. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
true conductivity The conductivity of fluid-filled rock where fluid distributions and saturations are representative of those in the uninvaded, undisturbed part of the formation. POSC well log trace classes   POSC provisional epicentre 2.2
water saturated conductivity The conductivity of rock completely saturated with connate water. POSC well log trace classes   POSC provisional epicentre 2.2
connate water conductivity The conductivity of the water entrapped in the interstices of the rock. POSC well log trace classes   POSC provisional epicentre 2.2
mud conductivity The conductivity of the continuous phase liquid used for the drilling of the well. POSC well log trace classes   POSC provisional epicentre 2.2
mud filtrate conductivity The conductivity of the effluent of the continuous phase liquid of the drillling mud which permeates porous and permeable rock. POSC well log trace classes   POSC provisional epicentre 2.2
mud cake conductivity The conductivity of the filter cake, the residue deposited on the borehole wall as mud loses filtrate into porous and permeable rock. POSC well log trace classes   POSC provisional epicentre 2.2
flushed zone conductivity The conductivity of the zone immediately behind the mud cake and which is considered to be flushed by mud filtrate, i.e., it is considered to have all mobile formation fluids displaced from it. POSC well log trace classes   POSC provisional epicentre 2.2
high frequency conductivity A measurement of the conductivity of the formation, by a high frequency electromagnetic tool, within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
deep conductivity The conductivity which represents a measurement made several feet into the formation; generally considered a measurement of the undisturbed formation. POSC well log trace classes   POSC provisional epicentre 2.2
deep induction conductivity The conductivity, measured by an induction log, which represents a measurement made several feet into the formation; generally considered a measurement of the undisturbed formation. POSC well log trace classes   POSC provisional epicentre 2.2
deep laterolog conductivity The conductivity, measured by a laterolog, which represents a measurement made several feet into the formation; generally considered a measurement of the undisturbed formation. POSC well log trace classes   POSC provisional epicentre 2.2
medium conductivity The conductivity which represents a measurement made approximately two to three feet into the formation; generally considered to measure the formation where it contain fluids which are a mixture of mud filtrate, connate water and possibly hydrocarbons. POSC well log trace classes   POSC provisional epicentre 2.2
medium induction conductivity The conductivity, made by an induction log, which represents a measurement made approximately two to three feet into the formation. POSC well log trace classes   POSC provisional epicentre 2.2
medium laterolog conductivity The conductivity, measured by a laterolog, which represents a measurement made approximately two to three feet into the formation. POSC well log trace classes   POSC provisional epicentre 2.2
shallow conductivity The conductivity which represents a measurement made approximately one to two feet into the formation; generally considered to measure the formation where it contains fluids which are comprised primarily of mud filtrate. POSC well log trace classes   POSC provisional epicentre 2.2
dipmeter conductivity The conductivity, measured by a dipmeter, which represents a measurement made approximately one to two feet into the formation; generally considered to measure the formation where it contains fluids which are comprised primarily of mud filtrate. POSC well log trace classes   POSC provisional epicentre 2.2
shallow induction conductivity The conductivity, measured by an induction log, which represents a measurement made approximately one to two feet into the formation; generally considered to measure the formation where it contains fluids which are comprised primarily of mud filtrate. POSC well log trace classes   POSC provisional epicentre 2.2
shallow laterolog conductivity The conductivity, measured by a laterolog, which represents a measurement made approximately one to two feet into the formation; generally considered to measure the formation where it contains fluids which are comprised primarily of mud filtrate. POSC well log trace classes   POSC provisional epicentre 2.2
spherically focused conductivity The conductivity, measured by a spherically focused log, which represents the resistivity approximately one to two feet into the formation. POSC well log trace classes   POSC provisional epicentre 2.2
micro conductivity A measurement of the conductivity of the formation within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2

well_log_trace_class

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identifier description naming _system parent _class source status version
micro laterolog conductivity A measurement of the conductivity of the formation, by a laterolog, within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
micro normal conductivity A conductivity measurement made by a micro log tool which measures within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
micro inverse conductivity A conductivity measurement made by a micro log tool which measures within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
micro spherically focused conductivity A measurement of the conductivity of the formation, by a spherically focused tool, within the first few cubic inches of the borehole wall. POSC well log trace classes   POSC provisional epicentre 2.2
shale volume An estimate of the amount of shale present in the formation. Frequently calculated from a gamma ray or SP curve. POSC well log trace classes   POSC provisional epicentre 2.2
synthetic well log trace A well log trace which has been artificially created, as opposed to an actual measurement, from associated measurements or information. POSC well log trace classes   POSC provisional epicentre 2.2
horizontal core permeability Permeability measured on a conventional core in a direction which would be horizontal; i.e., perpendicular to the borehole. POSC well log trace classes core permeability POSC provisional epicentre 2.2
vertical core permeability Permeability measured on a conventional core in a direction which would be vertical; i.e., parallel to the borehole. POSC well log trace classes core permeability POSC provisional epicentre 2.2
sidewall core permeability Permeability measured on a core sample acquired using a wireline sidewall coring tool. POSC well log trace classes core permeability POSC provisional epicentre 2.2

well_log_trace_class

identifier naming _system description parent _class source version status
  naming _system .identifier   well _log _trace _class .identifier   ref _version .identifier  
raw POSC well log process state A well log trace which has not had any processing. In other words, a trace which has not been depth adjusted or environmentally corrected.   POSC epicentre 2.2 current
processed POSC well log process state A well log trace has been processed in some way; e.g., depth adjusted or environmentally corrected.   POSC epicentre 3.0 current
depth adjusted POSC well log process state The process of depth correcting a trace by depth matching it to a reference trace. processed POSC epicentre 3.0 current
joined POSC well log process state A well log trace has had two or more runs spliced together to make a single trace.   POSC epicentre 3.0 current
edited POSC well log process state A well log trace has been corrected or adjusted through an editing process.   POSC epicentre 3.0 current
blocked POSC well log process state A well log trace has been edited to reflect sharp bed boundaries. The trace has a square wave appearance.   POSC epicentre 3.0 current
shifted POSC well log process state A well log trace has had its original values shifted by some factor; e.g., added or multiplied by a constant.   POSC epicentre 3.0 current
filtered POSC well log process state A well log trace has had a filter applied to it. activity POSC epicentre 3.0 current
smoothed POSC well log process state A well log trace has been filtered to smooth, or average the trace. activity POSC epicentre 3.0 current
enhanced POSC well log process state A well log trace has been filtered to improve its value; e.g. inverse filtering for better resolution. activity POSC epicentre 3.0 current
corrected POSC well log process state A trace has had corrections applied; e.g. environmental corrections. activity POSC epicentre 3.0 current
bed thickness correction POSC well log process state A trace has been corrected for bed thickness effects. activity POSC epicentre 3.0 current
formation properties correction POSC well log process state A trace has been corrected for formation properties; e.g., salinity. activity POSC epicentre 3.0 current
lithology correction POSC well log process state A trace has been corrected for lithology effects. activity POSC epicentre 3.0 current
porosity correction POSC well log process state A trace has been corrected for porosity effects. activity POSC epicentre 3.0 current
resistivity factor correction POSC well log process state A trace has been corrected for resistivity factor effects. activity POSC epicentre 3.0 current
formation density correction POSC well log process state A trace has been corrected for formation density effects. activity POSC epicentre 3.0 current
formation saturation correction POSC well log process state A trace has been corrected for formation saturation effects. activity POSC epicentre 3.0 current
formation water saturation correction POSC well log process state A trace has been corrected for water saturation effects. activity POSC epicentre 3.0 current

well_log_trace_class

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identifier naming _system description parent _class source version status
formation salinity correction POSC well log process state A trace has been corrected for the salinity effects from the water in the formation. activity POSC epicentre 3.0 current
formation water density correction POSC well log process state A trace has been corrected for the effects of the density of the formation water. activity POSC epicentre 3.0 current
hydrocarbon correction POSC well log process state A trace has been corrected for the effects of hydrocarbons. activity POSC epicentre 3.0 current
hydrocarbon density correction POSC well log process state A trace has been corrected for the effects of hydrocarbon density. activity POSC epicentre 3.0 current
hydrocarbon viscosity correction POSC well log process state A trace has been corrected for the effects of hydrocarbon viscosity. activity POSC epicentre 3.0 current
hydrocarbon gravity correction POSC well log process state A trace has been corrected for the effects of hydrocarbon gravity. activity POSC epicentre 3.0 current
formation volume factor correction POSC well log process state A trace has been corrected for the effects of the hydrocarbon formation volume factor. activity POSC epicentre 3.0 current
physical measurement correction POSC well log process state A trace has been corrected for various physical measurement effects; e.g. spreading loss. activity POSC epicentre 3.0 current
spreading loss correction POSC well log process state A trace has been corrected for the effects of spreading loss. activity POSC epicentre 3.0 current
diffusion correction POSC well log process state A trace has been corrected for the effects of diffusion. activity POSC epicentre 3.0 current
water holdup correction POSC well log process state A trace has been corrected for water holdup. activity POSC epicentre 3.0 current
slippage velocity correction POSC well log process state A trace has been corrected for slippage velocity. activity POSC epicentre 3.0 current
friction effect correction POSC well log process state A trace has been corrected for the effects of friction. activity POSC epicentre 3.0 current
tool diameter correction POSC well log process state A trace has been corrected for the tool diameter. activity POSC epicentre 3.0 current
borehole environment correction POSC well log process state A trace has been corrected for the effects of the borehole environment; e.g., borehole size. activity POSC epicentre 3.0 current
borehole size correction POSC well log process state A trace has been corrected for the effects of borehole size. activity POSC epicentre 3.0 current
borehole fluid correction POSC well log process state A trace has been corrected for the effects of borehole fluid; e.g., a mud cake correction. activity POSC epicentre 3.0 current
mud cake correction POSC well log process state A trace has been corrected for the effects of mud cake; e.g., mud cake thickness and/or density. activity POSC epicentre 3.0 current
mud cake thickness correction POSC well log process state A trace has been corrected for the effects of mud cake thickness. activity POSC epicentre 3.0 current
mud cake resistivity correction POSC well log process state A trace has been corrected for the effects of mud cake resistivity. activity POSC epicentre 3.0 current

well_log_trace_class

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identifier naming _system description parent _class source version status
mud cake density correction POSC well log process state A trace has been corrected for the effects of mud cake density. activity POSC epicentre 3.0 current
mud filtrate correction POSC well log process state A trace has been corrected for the effects of mud filtrate. This includes things such as filtrate salinity. activity POSC epicentre 3.0 current
mud filtrate resistivity correction POSC well log process state A trace has been corrected for the effects of mud filtrate resistivity. activity POSC epicentre 3.0 current
mud filtrate density correction POSC well log process state A trace has been corrected for the effects of mud filtrate density. activity POSC epicentre 3.0 current
mud filtrate salinity correction POSC well log process state A trace has been corrected for the effects of mud filtrate salinity. activity POSC epicentre 3.0 current
mud composition correction POSC well log process state A trace has been corrected for the effects of borehole fluid composition; e.g., a correction for KCl in the borehole fluid. activity POSC epicentre 3.0 current
water based fluid correction POSC well log process state A trace has been corrected for the effects of the components in a water based borehole fluid system; e.g., a correction for KCL in the mud. activity POSC epicentre 3.0 current
KCl mud correction POSC well log process state A trace has been corrected for the effects of KCl in the borehole fluid. activity POSC epicentre 3.0 current
barite mud correction POSC well log process state A trace has been corrected for the effects of barite in the borehole fluid. activity POSC epicentre 3.0 current
iron mud correction POSC well log process state A trace has been corrected for the effects of iron in the borehole fluid. activity POSC epicentre 3.0 current
bromide mud correction POSC well log process state A trace has been corrected for the effects of bromide in the borehole fluid. activity POSC epicentre 3.0 current
oil based mud correction POSC well log process state A trace has been corrected for the effects of oil based borehole fluid. activity POSC epicentre 3.0 current
mud weight correction POSC well log process state A trace has been corrected for the effects of weighting the borehole fluid. activity POSC epicentre 3.0 current
mud viscosity correction POSC well log process state A trace has been corrected for the effects of the viscosity of the borehole fluid. activity POSC epicentre 3.0 current
mud salinity correction POSC well log process state A trace has been corrected for the effects of salinity in the borehole fluid. activity POSC epicentre 3.0 current
temperature correction POSC well log process state A trace has been corrected for the effects of the temperature in the borehole. activity POSC epicentre 3.0 current
pressure correction POSC well log process state A trace has been corrected for the effects of pressure in the borehole. activity POSC epicentre 3.0 current
tool eccentricity correction POSC well log process state A trace has been corrected for the effects of the tool not being centered in the borehole. activity POSC epicentre 3.0 current
cased hole correction POSC well log process state A trace has been corrected for the effects of being recorded in a cased hole; e.g., corrected for casing weight and thickness. activity POSC epicentre 3.0 current
casing correction POSC well log process state A trace has been corrected for the effects of casing; this includes things such as casing weight, thickness and diameter. activity POSC epicentre 3.0 current

well_log_trace_class

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identifier naming _system description parent _class source version status
casing thickness correction POSC well log process state A trace has been corrected for the effects of casing thickness. activity POSC epicentre 3.0 current
casing weight correction POSC well log process state A trace has been corrected for the effects of casing weight. activity POSC epicentre 3.0 current
casing diameter correction POSC well log process state A trace has been corrected for the effects of casing diamter. activity POSC epicentre 3.0 current
cement correction POSC well log process state A trace has been corrected for the effects of the cement surrounding the casing; this includes cement thickness, density and type. activity POSC epicentre 3.0 current
cement thickness correction POSC well log process state A trace has been corrected for the effects of cement thickness. activity POSC epicentre 3.0 current
cement density correction POSC well log process state A trace has been corrected for the effects of cement density. activity POSC epicentre 3.0 current
cement type correction POSC well log process state A trace has been corrected for the effects of the type of cement used. activity POSC epicentre 3.0 current
synthetic well log trace generation POSC well log process state A well log trace has been artificially created, as opposed to an actual measurement, from associated measurements or information. activity POSC epicentre 3.0 current
up   The well log is acquired while the well logging instrument is being pulled up the wellbore. well log acquisition activity POSC epicentre 3.0 current
down   The well log is acquired while the well logging instrument is moving down the wellbore. well log acquisition activity POSC epicentre 3.0 current

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