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


N. Ruhovets,
Halliburton Logging Services


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.