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
By: James W. Schmoker and Timothy C. Hester
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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.
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 |
| Google Analytic Metrics | Metrics page |