Petrophysics Equations
Most common petrophysics equations in the oil and gas industry.
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Shale Volume
IGR
Larionov (1969)
Larionov (1969)- Old Rocks
Steiber (1970)
Clavier (1971)
Shale Volume SP
Porosity
Sonic Log
Wyllie et al. (1958)
Raymer et al. (1980)
Unconsolidated Formations
Hydrocarbons Effects
Density Log
Density
Neutron-Density
Resistivity Log
Resistivity Porosity
Porosity-Saturation = 1
Flushed Zone Porosity
Residual Hydrocarbon Porosity
Shale Corrected
Sonic- Dresser Atlas (1979)
Sonic- Dewan (1983)
Neutron - Schlumberger (1975)
Density- Schlumberger (1975)
Neutron-Dewan (1983)
Density-Dewan (1983)
Neutron-Density-Dewan (1983)
Permeability
Wyllie & Rose (1950)- M. Gravity Oil
Wyllie & Rose (1950)- Dry Gas
Timur (1968)
Coates & Dumanoir (1968)
NMR- Coates
NMR
Resistivity
Water Resistivity Rw - Archie
Water Resistivity - Western Atlas
Water Resistivity- SP
A. Water Resistivity Rwa - Archie
Total Resistivity Rt
Water Saturation
Archie (1942)
Compensated Sw- Dewan (1983)
Dewan (1983)- Dispersed Shale
Ferlt (1975)
Schlumberger (1975)
Simandoux (1963)
Total Water Saturation
Flushed Zone Rxo
Reserves
Oil Reserves
Gas Reserves
Conversions
Bibliography
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Petrophysics Equations List
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List of Equations
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Henry Herrera
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