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Geological Society, London, Special Publications; 1990; v. 48; p. 45-55;
DOI: 10.1144/GSL.SP.1990.048.01.06
© 1990 Geological Society of London

Sedimentology

Incorporating geological data in well log interpretation

D. E. King

Schlumberger Well Services, Austin Systems Center, PO Box 200015, Austin, TX 78720, USA
Graduate School of Business, Stanford University, Rains Houses Box #568, Stanford, CA 94305, USA

A multi-step technique is presented that permits a variety of quantitative and qualitative geological data to be incorporated in the log interpretation process to derive a detailed lithological analysis. The geological data are used to develop and refine explicit tool response and interpretation models. The models include synthetic wireline log data generated from input mineralogical and fluid data. These models are used in an interpretation system together with wireline data to provide a geologically reasonable lithological solution appropriate to the stratigraphic framework of a basin. An application of this technique is presented for a lithologically complex reservoir. A full suite of conventional logs was used together with core-derived data to provide an accurate level-by-level lithological analysis. The results contribute to the refined geological interpretation of the well.