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The AAPG/Datapages Combined Publications Database
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Souce-rock identification and quantification using wireline logs and interpretation techniques are examined for a well in the Paris Basin which penetrates the organic-rich lower Toarcian shale. An 18-m interval of the source rock was cored and logged with the Gamma Ray Spectrometry Tool (GST (FOOTNOTE *)) and Litho-Density (FOOTNOTE *) tool in order to determine the total organic carbon content (TOC). The GST carbon/oxygen ratio and calcium log are incorporated into a new interpretation which treats the formation as a mixture of solid, fluid, and kerogen. This analysis yields a carbon log with concentrations ranging from 4 to 11% and a total organic carbon log ranging from 2 to 6.5 %, both of which are in excellent agreement with core data. Of four discriminant functions reviously proposed for source-rock identification from conventional logs, only one correctly identifies the interval as a source rock; two others only identify intervals with total organic carbon (TOC) greater than 6%.
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