Applying gamma-ray logs to a carbonate reservoir: a Pakistan Potwar basin example

M. Younis Khan University of Peshawar Peshawar, Pakistan M. Gulraiz Akhter Zulfiqar Ahmad Quaid-i-Azam University Islamabad Reservoir rocks (carbonates and sands) are mainly sedimentary in nature with interconnected pore spaces (permeability), reflecting the ease with which hydrocarbons can flow in the rock, but the presence of clay minerals or shale in reservoir rocks creates problems while interpreting well logs. Very small amounts of shale can have a large effect on both key petrophysical properties (porosity and permeability). Most reservoirs contain some degree of shaliness; therefore one must identify the distribution of clay minerals to understand its effect on the reservoir qualit...

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