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Formation resistivity as an indicator of the onset of oil generation in the Woodford Shale, Anadarko Basin, Oklahoma

Proceedings of a symposium held April 5-6, 1988, at Norman, Oklahoma; cosponsored by the Oklahoma Geological Survey and the U.S. Geological Survey
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Abstract

The Upper Devonian and Lower Mississippian Woodford Shale is a black, organic-rich shale that is a major hydrocarbon source rock in the Anadarko basin. With the onset of oil generation, nonconductive hydrocarbons begin to replace conductive pore water in the Woodford, and formation resistivity increases. Crossplots of formation resistivity versus either vitrinite reflectance (RO) or Lopatin's time-temperature index of thermal maturity (TTI) define two data populations that represent immature shales and shales that have generated oil. The midpoint of the resistivity zone marking the transition between immature and mature shales is -35 ohm-m. The onset of appreciable oil generation in the Woodford Shale of the study area occurs at maturity levels of RO near 0.57% and of TTI between 33 and 48.

Suggested Citation

Schmoker, J.W., Hester, T.C., 1989, Formation resistivity as an indicator of the onset of oil generation in the Woodford Shale, Anadarko Basin, Oklahoma, chap. of Anadarko Basin symposium, 1988 (Circular 90), p. 262-266.

Study Area

Publication type Book chapter
Publication Subtype Book Chapter
Title Formation resistivity as an indicator of the onset of oil generation in the Woodford Shale, Anadarko Basin, Oklahoma
Series number 90
Year Published 1989
Language English
Publisher Oklahoma Geological Survey
Publisher location Norman, OK
Description 5 p.
Larger Work Type Report
Larger Work Subtype Other Government Series
Larger Work Title Anadarko Basin symposium, 1988 (Circular 90)
First page 262
Last page 266
Country United States
State Oklahoma
Other Geospatial Anadarko Basin
Additional publication details