POSC Specifications
Version 2.2 		Epicentre Standard Values
well_log_trace_class

well_log_trace_class

Changes Document
 Standard Instance Values

Alias values exist. Go to well_log_trace_class_alias.

name description classification _system source status version
    classification _system .name ref _source .name   ref _epicentre _version .name
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 2.2
wireline Logging measurements taken using well logging tools conveyed on wireline. POSC well log acquisition type POSC provisional 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 2.2
area A particular extent of space or surface. POSC well log trace classes POSC provisional 2.2
resistivity The property measuring the resistance to flow of an electrical current. POSC well log trace classes POSC provisional 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 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 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 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 2.2
electric current The flow of electric charge. POSC well log trace classes POSC provisional 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 2.2
volume cubic capacity POSC well log trace classes POSC provisional 2.2
velocity directional speed POSC well log trace classes POSC provisional 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 2.2
time A measured or measurable period. POSC well log trace classes POSC provisional 2.2
sampling To take a sample of or from something. POSC well log trace classes POSC provisional 2.2
salinity The concentration of ions in solution. POSC well log trace classes POSC provisional 2.2
quality Degree of excellence. POSC well log trace classes POSC provisional 2.2
pressure The force or thrust exerted upon a surface divided by the area of the surface. POSC well log trace classes POSC provisional 2.2

well_log_trace_class

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name description classification _system source status version
plane angle An angle formed by two intersecting lines. POSC well log trace classes POSC provisional 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 2.2
resistivity phase shift The amount of change in the phase of an electrical wave. POSC well log trace classes POSC provisional 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 POSC provisional 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 2.2
length A measured distance or dimension. POSC well log trace classes POSC provisional 2.2
interpretation variable A variable in a well log interpretation equation. POSC well log trace classes POSC provisional 2.2
image The likeness of an object produced by an electrical device. POSC well log trace classes POSC provisional 2.2
gradiomanometer The measurement of the average density of fluids in a wellbore. POSC well log trace classes POSC provisional 2.2
force Energy excerted or brought to bear. POSC well log trace classes POSC provisional 2.2
tension The tension on the wireline cable while logging. POSC well log trace classes POSC provisional 2.2
fluid viscosity The amount of a fluid resistance to flow. POSC well log trace classes POSC provisional 2.2
acoustic velocity The velocity of an acoustic wave. POSC well log trace classes POSC provisional 2.2
fluid velocity The velocity of a flowing fluid. POSC well log trace classes POSC provisional 2.2
fluid density The quantity per unit volume of fluid. POSC well log trace classes POSC provisional 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 2.2
electric potential The difference in electrical energy between two systems. POSC well log trace classes POSC provisional 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 2.2
dielectric Relative permittivity. POSC well log trace classes POSC provisional 2.2
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 2.2

well_log_trace_class

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name description classification _system source status version
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 2.2
bulk compressibility The relative compressiblity of a material. POSC well log trace classes POSC provisional 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 2.2
acoustic impedance Seismic velocity multiplied by density. POSC well log trace classes POSC provisional 2.2
acceleration Output from an accelerometer on a logging tool. POSC well log trace classes POSC provisional 2.2
ratio A relationship between two values usually expressed as a fraction. POSC well log trace classes POSC provisional 2.2
amplitude ratio The ratio of two amplitudes. POSC well log trace classes POSC provisional 2.2
count rate ratio The ratio of two count rates. POSC well log trace classes POSC provisional 2.2
elemental ratio The ratio of two different elemental measurements; e.g. K/U. POSC well log trace classes POSC provisional 2.2
C/O ratio The ratio of the Carbon measurement to the Oxygen measurement. POSC well log trace classes POSC provisional 2.2
Th/K ratio The ratio of the Thorium measurment to the Potassium measurment. POSC well log trace classes POSC provisional 2.2
resistivity ratio The ratio of two resistivity values. POSC well log trace classes POSC provisional 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 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 POSC provisional 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 POSC provisional 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 POSC provisional 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 POSC provisional 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 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 2.2
decay time The time it takes for a population to decay, generally expressed as a half life. POSC well log trace classes POSC provisional 2.2

well_log_trace_class

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name description classification _system source status version
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 2.2
nuclear magnetic decay time The decay time of a nuclear magnetic signal. POSC well log trace classes POSC provisional 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 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 POSC provisional 2.2
mechanical casing collar locator The signal measured by a mechanical device at the location of casin g collars and other features (e.g., perforations). POSC well log trace classes POSC provisional 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 POSC provisional 2.2
high frequency electromagnetic High frequency electromagnetic measurements, e.g. from a dielectric logging tool. POSC well log trace classes POSC provisional 2.2
temperature A temperature measurement. POSC well log trace classes POSC provisional 2.2
bit size The diameter of the drill bit used to drill the hole. POSC well log trace classes POSC provisional 2.2
count rate The rate of occurences; e.g. the far counts from a density tool.. POSC well log trace classes POSC provisional 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 2.2
photoelectric absorption correction The correction that is to be made to the photoelectric absorption curve. POSC well log trace classes POSC provisional 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 2.2
permeability The permeability of the surrounding formation. POSC well log trace classes POSC provisional 2.2
nuclear magnetism log permeability The permeability derived from a nuclear magnetism log. POSC well log trace classes POSC provisional 2.2
core permeability The permeability derived from a core. POSC well log trace classes POSC provisional 2.2
log derived permeability The permeability derived from a well log. POSC well log trace classes POSC provisional 2.2
depth The distance to a point in a wellbore. POSC well log trace classes POSC provisional 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 2.2
measured depth The distance measured along the path of a wellbore. POSC well log trace classes POSC provisional 2.2

well_log_trace_class

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name description classification _system source status version
depth derived from velocity The depth calculated from velocity information. POSC well log trace classes POSC provisional 2.2
bulk volume A quantity per unit volume. POSC well log trace classes POSC provisional 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 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 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 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 2.2
caliper A well log used to record hole diameter (open or cased). POSC well log trace classes POSC provisional 2.2
mechanical caliper A well log which uses a mechanical device to measure hole diameter. POSC well log trace classes POSC provisional 2.2
acoustic caliper A well log which uses an acoustic device to measure hole diameter. POSC well log trace classes POSC provisional 2.2
nuclear caliper A well log which uses a nuclear device to measure hole diameter. POSC well log trace classes POSC provisional 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 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 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 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 2.2
amplitude Any measurement of the maximum departure of a wave from an average value. POSC well log trace classes POSC provisional 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 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 2.2
attenuation The amount of reduction in the amplitude of a wave. POSC well log trace classes POSC provisional 2.2
attenuation of acoustic wave The amount of reduction in the amplitude of an acoustic wave. POSC well log trace classes POSC provisional 2.2
attenuation of E-M wave The amount of reduction in the amplitude of an electromagnetic wave. POSC well log trace classes POSC provisional 2.2

well_log_trace_class

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name description classification _system source status version
saturation The fraction or percentage of the pore volume of a rock. POSC well log trace classes POSC provisional 2.2
water saturation The fraction or percentage of pore volume of rock occupied by water. POSC well log trace classes POSC provisional 2.2
hydrocarbon saturation The fraction or percentage of pore volume of rock occupied by hydrocarbon. POSC well log trace classes POSC provisional 2.2
gas saturation The fraction or percentage of pore volume of rock occupied by gas. POSC well log trace classes POSC provisional 2.2
oil saturation The fraction or percentage of pore volume of rock occupied by oil. POSC well log trace classes POSC provisional 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 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 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 2.2
total gamma ray The measurement of all the naturally occurring gamma radiation. POSC well log trace classes POSC provisional 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 2.2
potassium The measurement of gamma radiation emitted by potassium. POSC well log trace classes POSC provisional 2.2
thorium The measurement of gamma radiation emitted by thorium. POSC well log trace classes POSC provisional 2.2
uranium The measurement of gamma radiation emitted by urnaium. POSC well log trace classes POSC provisional 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 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 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 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 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 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 2.2
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 2.2

well_log_trace_class

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name description classification _system source status version
electromagnetic wave travel time The time it takes for an electromagnetic wave to traverse a fixed distance. POSC well log trace classes POSC provisional 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 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 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 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 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 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 2.2
density Mass per unit Volume - well logging units are usually gm/cc. POSC well log trace classes POSC provisional 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 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 2.2
OH density porosity Porosity calculated from an open hole density log using a dolomite matrix. POSC well log trace classes POSC provisional 2.2
CH density porosity Porosity calculated from an cased hole density log using a dolomite matrix. POSC well log trace classes POSC provisional 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 2.2
core matrix density The density of a rock matrix measured on a core sample. POSC well log trace classes POSC provisional 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 2.2
high frequency electromagnetic porosity Porosity calculated using a high frequency electromagnetic measurement as input. POSC well log trace classes POSC provisional 2.2
core porosity Porosity from a core measurement. POSC well log trace classes POSC provisional 2.2
conventional core porosity Porosity from a measurement made on a conventional core. POSC well log trace classes POSC provisional 2.2
sidewall core porosity Porosity from a measurement made on a sidewall core. POSC well log trace classes POSC provisional 2.2
nuclear magnetism porosity Porosity calculated using the measurements from a nuclear magnetismlogging pass. POSC well log trace classes POSC provisional 2.2

well_log_trace_class

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name description classification _system source status version
total porosity The total pore volume occupied by fluid in a rock. POSC well log trace classes POSC provisional 2.2
effective porosity The interconnected pore volume occupied by free fluids. POSC well log trace classes POSC provisional 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 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 2.2
density porosity Porosity calculated using the bulk density measurement from a density log. POSC well log trace classes POSC provisional 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 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 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 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 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 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 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 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 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 2.2
neutron porosity Porosity from a neutron log. POSC well log trace classes POSC provisional 2.2
limestone neutron porosity Porosity calculated from a neutron log using a limestone matrix. POSC well log trace classes POSC provisional 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 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 2.2
sandstone neutron porosity Porosity calculated from a neutron log using a sandstone matrix. POSC well log trace classes POSC provisional 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 2.2

well_log_trace_class

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name description classification _system source status version
CH sandstone neutron porosity Porosity calculated from an open hole neutron log using a sandstone matrix. POSC well log trace classes POSC provisional 2.2
CH dolomite neutron porosity Porosity calculated from a cased hole neutron log using a dolomite matrix. POSC well log trace classes POSC provisional 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 2.2
dolomite neutron porosity Porosity calculated from a neutron log using a dolomite matrix. POSC well log trace classes POSC provisional 2.2
OH neutron porosity Porosity calculated from an open hole neutron log using a dolomite matrix. POSC well log trace classes POSC provisional 2.2
CH neutron porosity Porosity calculated from a cased hole neutron log using a dolomite matrix. POSC well log trace classes POSC provisional 2.2
pulsed neutron porosity Porosity calculated from a pulsed neutron log. POSC well log trace classes POSC provisional 2.2
acoustic porosity Porosity calculated from an acoustic log. POSC well log trace classes POSC provisional 2.2
limestone acoustic porosity Porosity calculated from an acoustic log using a limestone matrix. POSC well log trace classes POSC provisional 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 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 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 2.2
sandstone acoustic porosity Porosity calculated from an acoustic log using a sandstone matrix. POSC well log trace classes POSC provisional 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 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 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 2.2
dolomite acoustic porosity Porosity calculated from an acoustic log using a dolomite matrix. POSC well log trace classes POSC provisional 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 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 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 2.2

well_log_trace_class

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name description classification _system source status version
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 2.2
water saturated resistivity The resistivity of rock completely saturated with connate water. POSC well log trace classes POSC provisional 2.2
connate water resistivity The resistivity of the water entrapped in the interstices of the rock. POSC well log trace classes POSC provisional 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 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 2.2
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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 2.2

well_log_trace_class

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name description classification _system source status version
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 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 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 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 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 2.2
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 2.2
water saturated conductivity The conductivity of rock completely saturated with connate water. POSC well log trace classes POSC provisional 2.2
connate water conductivity The conductivity of the water entrapped in the interstices of the rock. POSC well log trace classes POSC provisional 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 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 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 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 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 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 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 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 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 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 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 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 2.2

well_log_trace_class

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name description classification _system source status version
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 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 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 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 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 2.2
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 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 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 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 2.2
raw 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 well log trace classes POSC provisional 2.2
processed A well log trace which has been processed in some way; e.g., depth adjusted or environmentally corrected. POSC well log trace classes POSC provisional 2.2
depth adjusted The process of depth correcting a trace by depth matching it to a reference trace. POSC well log trace classes POSC provisional 2.2
joined A well log trace which has had two or more runs spliced together to make a single trace. POSC well log trace classes POSC provisional 2.2
edited A well log trace which has been corrected or adjusted through an editing process. POSC well log trace classes POSC provisional 2.2
blocked A well log trace which has been edited to reflect sharp bed boundaries. The trace has a square wave appearance. POSC well log trace classes POSC provisional 2.2
shifted A well log trace which has had its original values shifted by some factor; e.g., added or multiplied by a constant. POSC well log trace classes POSC provisional 2.2
filtered A well log trace which has had a filter applied to it. POSC well log trace classes POSC provisional 2.2
smoothed A well log trace which has been filtered to smooth, or average the trace. POSC well log trace classes POSC provisional 2.2
enhanced A well log trace which has been filtered to improve its value; e.g. inverse filtering for better resolution. POSC well log trace classes POSC provisional 2.2
corrected A trace which has had corrections applied; e.g. environmental corrections. POSC well log trace classes POSC provisional 2.2

well_log_trace_class

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name description classification _system source status version
bed thickness correction A trace which has been corrected for bed thickness effects. POSC well log trace classes POSC provisional 2.2
formation properties correction A trace which has been corrected for formation properties; e.g., salinity. POSC well log trace classes POSC provisional 2.2
lithology correction A trace which has been corrected for lithology effects. POSC well log trace classes POSC provisional 2.2
porosity correction A trace which has been corrected for porosity effects. POSC well log trace classes POSC provisional 2.2
resistivity factor correction A trace which has been corrected for resistivity factor effects. POSC well log trace classes POSC provisional 2.2
formation density correction A trace which has been corrected for formation density effects. POSC well log trace classes POSC provisional 2.2
formation saturation correction A trace which has been corrected for formation saturation effects. POSC well log trace classes POSC provisional 2.2
formation water saturation correction A trace which has been corrected for water saturation effects. POSC well log trace classes POSC provisional 2.2
formation salinity correction A trace which has been corrected for the salinity effects from the water in the formation. POSC well log trace classes POSC provisional 2.2
formation water density correction A trace which has been corrected for the effects of the density of the formation water. POSC well log trace classes POSC provisional 2.2
hydrocarbon correction A trace which has been corrected for the effects of hydrocarbons. POSC well log trace classes POSC provisional 2.2
hydrocarbon density correction A trace which has been corrected for the effects of hydrocarbon density. POSC well log trace classes POSC provisional 2.2
hydrocarbon viscosity correction A trace which has been corrected for the effects of hydrocarbon viscosity. POSC well log trace classes POSC provisional 2.2
hydrocarbon gravity correction A trace which has been corrected for the effects of hydrocarbon gravity. POSC well log trace classes POSC provisional 2.2
formation volume factor correction A trace which has been corrected for the effects of the hydrocarbon formation volume factor. POSC well log trace classes POSC provisional 2.2