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Integrated Study to Assess the Diagenetic Impacts on Petro-Physical Characteristics and Reservoir Quality of Sukkur Rift Zone

. Faisal Hussain Memon, Abdul Haque Tunio, Aftab Ahmed Mahesar, Khalil Rehman Memon & Ghulam Abbas


Abstract

Sukkur Rift Zone is proven to be the most significant hydrocarbon potential resource area of Lower Indus Basin of Pakistan. It comprises of various carbonate gas producing reservoirs of Eocene and Oligocene formations. These reservoirs are getting depleted due to reservoir heterogeneities and production complexities caused by diagenetic effects. In this study, an integrated reservoir characterization of Sui Upper (SUL) and Sui Main Limestone (SML) formations was carried out through pore morphology and mineralogical assessment by Scanning electron microscope (SEM), Energy dispersive X-ray spectroscopy (EDS) and Fourier transform infrared (FTIR). The impact of diagenetic alterations on reservoir quality was measured though thin section analysis, porosity and permeability measurement. SEM, EDS and FTIR analysis interpreted a fair pore-morphology and grain structure; predominantly composed of calcite and dolomite with other cementing materials. Petrography analysis revealed that gray colored mudstone to grainstone texture with numerous diagenetic features which reduces carbonate reservoir quality. The evaluated petro-physical properties indicating fair porosity and reduced permeability. The presented study will be beneficial to reduce the reservoir management uncertainties of carbonate reservoirs and also helps in improving the productivity of indigenous resources.

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