AAPG Middle East Region Geoscience Technology Workshop

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Geologically Consistent Resolution Enhancement of Petrophysical Analysis Using Image Log Data


Very thin, laminated sand-shale sequences pose a challenge to petrophysical evaluation. The poor vertical resolution of the log measurements results in pessimistic estimates of hydrocarbon volumes and producibility. Such formations contain much more hydrocarbon than is apparent from the low resistivity values recorded. Attempts to enhance the resolution of the analysis using a high-resolution clay indicator – such as an image log – need to account for variations in clay mineralogy and porosity with clay content. We present here a technique to incorporate results of core mineralogy measurements to ensure a geologically consistent resolution enhancement of the petrophysical analysis and we compare the results in an actual field example.recovery factor.