Volume of organic-rich Devonian shale in the Appalachian Basin: relating "black" to organic-matter content: Geologic notes
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Abstract
Some estimates of natural-gas resources in the Devonian shale of the Appalachian basin depend on the volume of organic-rich shale in the basin. A map by L. G. Wallace and W. de Witt showing the thickness and extent of Devonian "black" shale facies in the Appalachian basin is widely used as an indicator of organic-rich shale, but the map is derived from subjective evaluations of shale color. Wallace and de Witt's definition of "black" is shown here to correspond to an organic-matter content of approximately 4% or more by volume and a Munsell color value for dry pressed-powder samples of about N5 (medium gray) or darker. The volume of Devonian shale with an organic-matter content greater than 2.0% by volume (a definition of "organic-rich" that is preferred by the writers) a erages 1.44 times that of the "black" shale of Wallace and de Witt, and totals about 2,574 × 1012 cu ft (72.9 × 1012 cu m) in the Appalachian basin.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Volume of organic-rich Devonian shale in the Appalachian Basin: relating "black" to organic-matter content: Geologic notes |
| Series title | American Association of Petroleum Geologists Bulletin |
| DOI | 10.1306/03B59B1B-16D1-11D7-8645000102C1865D |
| Volume | 66 |
| Issue | 3 |
| Year Published | 1982 |
| Language | English |
| Publisher | American Association of Petroleum Geologists |
| Description | 4 p. |
| First page | 375 |
| Last page | 378 |
| Country | United States |
| Other Geospatial | Appalachian Basin |
| Google Analytic Metrics | Metrics page |