| US 7,538,319 B2 | ||
| Use of thorium-uranium ratio as an indicator of hydrocarbon source rock | ||
| David J. Jacobi, The Woodlands, Tex. (US); and John M. Longo, Houston, Tex. (US) | ||
| Assigned to Baker Hughes Incorporated, Houston, Tex. (US) | ||
| Filed on Jun. 27, 2007, as Appl. No. 11/769,129. | ||
| Claims priority of provisional application 60/817497, filed on Jun. 29, 2006. | ||
| Prior Publication US 2008/0179510 A1, Jul. 31, 2008 | ||
| Int. Cl. G01V 5/10 (2006.01) | ||
| U.S. Cl. 250—269.6 | 24 Claims |
| 1. A method of estimating source rock content of an earth formation, the method comprising:
making measurements of natural, gamma radiation within a borehole;
analyzing the measured radiation to determine a thorium to uranium (Th/U) ratio; and
using the determined Th/U ratio and an estimate of a total amount of organic carbon in the formation to determine a presence
of source rock in the formation; and
recording the presence of source rock on a suitable medium.
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