Petrophysics

Acoustic transit time

6.1

Amplitude transmission coefficient in seismic reflection and refraction

6.2

Apparent intensity reflected by recorder (gamma ray)

6.3

Apparent resistivity

6.4

Apparent sorption compressibility

6.5

Atlas wireline neutron lifetime log

6.6

Barenblatt-Chorin universal velocity distribution

6.7

Coefficient of reflection

6.8

Compaction correction factor for sonic logs in shale lithology

6.9

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

6.10

Correlation of mud cake resistivity to mud resistivity

6.11

Correlation of mud filtrate resistivity to mud resistivity

6.12

Diffuse-layer thickness

6.13

Effect of clay on conductivity

6.14

Effective photoelectric absorption cross section index

6.15

Electric resistance to a radial current from a wellbore

6.16

Electrochemical potential (SP log)

6.17

Electrokinetic potential (developed across a mud cake)

6.18

Electron density index (GR absorbtion logging)

6.19

Epithermal neutron diffusion coefficient

6.20

Epithermal neutron distribution (epithermal neutron flux)

6.21

Fertl and Hammack equation

6.22

Formation conductivity in dual water model

6.23

Formation factor – Archie’s equation

6.24

Formation factor (Archie’s equation with resistivity logs)

6.25

Formation resistivity and permeability (Carothers) relation for limestones

6.26

Formation resistivity and permeability (Carothers) relation for sandstones

6.27

Formation resistivity and porosity relations for carbonate rocks

6.28

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

6.29

Fraction of total porosity occupied by clays

6.30

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

6.31

Fxo / Fs approach

6.32

Gamma ray log shale index

6.33

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

6.34

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

6.35

Geometric coefficient for the electrode

6.36

Geometric coefficient for the lateral device

6.37

Geometric coefficient for the normal sonde

6.38

Half thickness value

6.39

Hingle nonlinear-resistivity/linear-porosity crossplot

6.40

Humble equation (formation resistivity factor vs porosity)

6.41

Integrated radial geometric factor

6.42

Lennard Jones potential

6.43

Linear absorption (attenuation) coefficient

6.44

Maximum potential for self-potential (SP) log

6.45

Mean free path (photon absorption)

6.46

Membrane potential

6.47

Neutron lethargy (logarithmic energy decrement)

6.48

Neutron porosity of shale zone

6.49

Oil saturation determination (IE and CDN logs)

6.50