Geochemical Analysis of the Reservoir Rocks of Surma Basin, Bangladesh

Geochemical analysis of three major gas fields (Kailastila (Well 2), Rashidpur (Well 4) and Fenchuganj (Well 2)) of the Surma Basin has been performed in this study to characterize source rocks and to understand the composition, rock types, and environment of accumulation of sediment of the basin. The XRF analytical result shows that the rock samples are comprised of moderate to high SiO2 contents (50-58%; on average 55%) with a significant amount of Al2O3 (~23%). The SiO2 content and the SiO2/Al2O3 ratio of the samples reflect the intermediate quartz richness. In trace element concentration, Arsenic (As) in the reservoir rocks is more than the permissible limit of WHO. Analyses using different discriminating diagrams show that the reservoir rocks of the…