Petroleum Office
Download
Pricing
Functions
Unit Converter
Docs
Home
Formulas
Petrophysics
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
Categories
Reservoir Engineering
Drilling Engineering
Well Test Analysis
Production Engineering
Fluid Flow and Transport Phenomena
Petrophysics
Petroleum Economics
Phase Behavior and Thermodynamics
Petroleum Engineering Laboratory
Enhanced Oil Recovery and Geothermal
Geomechanics and Fracturing
Facilities and Process Engineering
An unhandled error has occurred.
Reload
🗙