Determining water saturation

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Exploring for Oil and Gas Traps
Series Treatise in Petroleum Geology
Part Predicting the occurrence of oil and gas traps
Chapter Predicting reservoir system quality and performance
Author Dan J. Hartmann, Edward A. Beaumont
Link Web page
Store AAPG Store

Water saturation (Sw) can be measured directly from a sealed core, which is an expensive method, or it can be calculated from the Archie equation,[1] which is less expensive. Sw can also be estimated using a graphical representation of the Archie equation known as the Pickett plot.[2]

See also


  1. Archie, G. E., 1942, The electrical resistivity log as an aid in determining some reservoir characteristics: Petroleum Transactions of AIME 146: 54–62.
  2. Pickett, G. R., 1973, Pattern recognition as a means of formation evaluation: The Log Analyst, vol. 14, no. 4, p. 3–11.

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