Category

Petrophysics

86 items

Acoustic transit time

Amplitude transmission coefficient in seismic reflection and refraction

Apparent intensity reflected by recorder (gamma ray)

Apparent resistivity

Apparent sorption compressibility

Atlas wireline neutron lifetime log

Barenblatt-Chorin universal velocity distribution

Coefficient of reflection

Compaction correction factor for sonic logs in shale lithology

Composite capture cross section of the formation (Schlumberger thermal decay time tool)

Correlation of mud cake resistivity to mud resistivity

Correlation of mud filtrate resistivity to mud resistivity

Diffuse-layer thickness

Effect of clay on conductivity

Effective photoelectric absorption cross section index

Electric resistance to a radial current from a wellbore

Electrochemical potential (SP log)

Electrokinetic potential (developed across a mud cake)

Electron density index (GR absorbtion logging)

Epithermal neutron diffusion coefficient

Epithermal neutron distribution (epithermal neutron flux)

Fertl and Hammack equation

Formation conductivity in dual water model

Formation factor - Archie's equation

Formation factor (Archie's equation with resistivity logs)

Formation resistivity and permeability (Carothers) relation for limestones

Formation resistivity and permeability (Carothers) relation for sandstones

Formation resistivity and porosity relations for carbonate rocks

Formation resistivity and porosity relations from well log data based on Porter and Carothers data

Fraction of total porosity occupied by clays

Fresh water-filled porosity (fresh-water-bearing limestones)

Fxo / Fs approach

Gamma ray log shale index

General form of the Archie equation-Water saturation from resistivity logs

Generalized relationship between formation resistivity factor and porosity (Chevron formula)

Geometric coefficient for the electrode

Geometric coefficient for the lateral device

Geometric coefficient for the normal sonde

Half thickness value

Hingle nonlinear-resistivity/linear-porosity crossplot

Humble equation (formation resistivity factor vs porosity)

Integrated radial geometric factor

Lennard Jones potential

Linear absorption (attenuation) coefficient

Maximum potential for self-potential (SP) log

Mean free path (photon absorption)

Membrane potential

Neutron lethargy (logarithmic energy decrement)

Neutron porosity of shale zone

Oil saturation determination (IE and CDN logs)

Pair production (gamma ray interactions)

Phillips equation (sandstones)

Photoelectric absorption cross sectional area

Pickett crossplot

Poisson's ratio (seismic arrival time method)

Porosity by using density log data

Porosity corrected for gas effect

Porosity-neutron flux relationship

Rate of radioactive decay

Relation between concentration of K, Th, or U and recorded total gamma ray signal

Relationship between rock resistivity and water saturation

Relationship between SSP and Rw (NaCl predominant)

Relationship between SSP and Rw (non-ideal shale membrane)

Relationship between SSP and Rw for water containing salts (non-NaCl predominant)

Resistivity of a partially saturated shaly sand with hydrocarbons (Vsh models)

Resistivity of a water-saturated shaly sand (Vsh models)

Rock conductivity (relatively clean water bearing rocks)

Shale index from gamma ray spectrometry

Simandoux (total shale) equation

Sonic porosity (Raymer Hunt Gardner method)

Spacing between transmitter and receiver

Static self potential

Time between the initiation of the pulse and the first arrival acoustic energy at the receiver

Time-average relation in compacted formations (porosity/transit time relationships)

Time-average relation in uncompacted formations (porosity/transit time relationships)

Tortuosity (resistivity logs)

Total rock conductivity

True porosity from sonic log (corrected for compaction)

True resistivity - Archie

Volumetric photoelectric absorption cross section

Water salinity index ratio

Water saturation determination (IE and CDN logs)

Water saturation from neutron tools

Water saturation - Resistivity logs

Wavelength equation

Wellbore electric voltage generation

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