Wireline Source-Rock Evaluation in the Paris Basin
http://archives.datapages.com/data/specpubs/geochem1/data/a032/a032/0001/0050/0057.htmPub. Id: A032 (1990)
First Page: 57
Last Page: 71
Book Title: SG 30: Deposition of Organic Facies
Article/Chapter: Wireline Source-Rock Evaluation in the Paris Basin: Chapter 5
Subject Group: Geochemistry, Generation, Migration
Spec. Pub. Type: Studies in Geology
Pub. Year: 1990
Author(s): Susan L. Herron, Louis Le Tendre
Abstract:Souce-rock identification and quantification usingwireline logs and interpretation techniques are examined for a well inthe Paris Basin which penetrates the organic-rich lower Toarcian shale.An 18-m interval of the source rock was cored and logged with the GammaRay Spectrometry Tool (GST (FOOTNOTE *)) and Litho-Density (FOOTNOTE *)tool in order to determine the total organic carbon content (TOC). TheGST carbon/oxygen ratio and calcium log are incorporated into a newinterpretation which treats the formation as a mixture of solid, fluid,and kerogen. This analysis yields a carbon log with concentrationsranging from 4 to 11% and a total organic carbon log ranging from 2 to6.5 %, both of which are in excellent agreement with core data. Of fourdiscriminant functionsreviously proposed for source-rock identification from conventionallogs, only one correctly identifies the interval as a source rock; twoothers only identify intervals with total organic carbon (TOC) greaterthan 6%.
