A Log Analysis Technique for Evaluating Laminated Reservoirs In The Gulf Coast Area

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N. Ruhovets,
Halliburton Logging Services

Abstract

Evaluation of thinly laminated shaly sand reservoirs has long been one of the most difficult problems of log analysis. A primary reason is that only shallow shale indicators such as a Dipmeter or other micro resistivity devices, or an ultra high frequency dielectric tool, or an unfiltered Pe-index have vertical resolutions compatible with the most common thicknesses of the thinly bedded shale or sand laminae. To overcome this problem a technique has been developed to reconstruct deep Induction conductivity and to compute effective porosity and water saturation consistent with the high vertical resolution of a shale indicator such as the Dipmeter.