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Geological Society, London, Special Publications; 1990; v. 48; p. 241-252;
DOI: 10.1144/GSL.SP.1990.048.01.20
© 1990 Geological Society of London

Mineralogy and Geochemistry

Identification of source rocks from wireline logs

A. E. Stocks & S. R. Lawrence

Exploration Consultants Limited, Henley-on-Thames, Oxfordshire, UK

This paper reviews the properties of organic-rich rocks which constitute petroleum source rocks and investigates petrophysical methods which can be used for their assessment. A review is made of the common log data and their response to an appreciable organic content in shale formations. Associations and effects which might lead to an erroneous assessment are also discussed. Previous researchers have highlighted relationships between organic content and various log parameters or values. These rely on geochemical control and tend to be stratigraphically and regionally specific. In this paper we show how standard petrophysical processing can be applied for qualitative and semi-quantitative evaluation of organic content and therefore source rock potential. Recommendations are made for a reform in geochemical sampling which will enable better quantitation methods for more widespread application.





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