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Integration of Core, Log and Well Test Permeabilities in Deepwater Laminated Sand-Shale Reservoir

Atul Jamkhindikar, Bhawesh C. Jha, Samir Dhar, and Satyajit Taware
Reliance Industries Ltd., Navi Mumbai, India

Reservoir characterization requires accurate estimates of Previous HitpermeabilityNext Hit at reservoir scale. Previous HitPermeabilityNext Hit data can be obtained Previous HitfromNext Hit three sources- core measurements, log-derived Previous HitpermeabilityNext Hit and well test data. However, the volume scales for these measurements are different by several orders of magnitude. In a heterogeneous, laminated sand-shale sequence, core measurements represent Previous HitsandstoneNext Hit Previous HitpermeabilityNext Hit, log measurements are influenced by average response to the sand-shale laminae, while well test Previous HitpermeabilityNext Hit is influenced by rock fabric and reservoir connectivity. This paper describes the methodology to calibrate Previous HitpermeabilityNext Hit measurements across the above scales and derive reservoir scale Previous HitpermeabilityNext Hit as a continuous log in the well.

The workflow consists of Previous HitestimationNext Hit of laminated sand fraction, sand effective porosity and water saturation using Thomas-Stieber model incorporating resistivity anisotropy concept, and calibration of the estimated sand layer Previous HitpermeabilityNext Hit to core measurements. Log-scale Previous HitpermeabilityNext Hit is calculated using the layered sand-shale model and calibrated to well test Previous HitpermeabilityNext Hit using pressure transient analysis.

This method was applied to a deep-water gas-bearing Previous HitsandstoneNext Hit reservoir where laminated sand-shale sequences constitute a significant volume of the reservoir. The log-scale Previous HitpermeabilityNext Hit was calibrated to well tests, one representing thick sands and another laminated sands. Good match was observed between log-scale Previous HitpermeabilityNext Hit and well test Previous HitpermeabilityNext Hit for thick sands whereas for laminated sands a significant difference was observed which was attributed to connectivity of sand laminae at reservoir scale. A non-linear correction factor, dependent on laminated shale fraction was derived to calibrate the log-scale Previous HitpermeabilityNext Hit to the reservoir scale.

The methodology leads to upscaling of Previous HitpermeabilityNext Hit Previous HitfromNext Hit core to log to reservoir scale in a systematic manner which helps to achieve realistic Previous HitpermeabilityTop distribution for reservoir simulation studies.

Presentation GEO India Expo XXI, Noida, New Delhi, India 2008©AAPG Search and Discovery