2D Seismic Reflection Data Interpretation of Sinjhoro Exploration Lease, Southern Indus Basin

Abstract

This dissertation contains the study of 2D seismic reflection data interpretation of selected seismic lines of Sinjhoro Exploration Lease (EL), Southern Indus Basin, Pakistan, for delineation of subsurface structures favorable for hydrocarbon accumulation. This Exploration Lease is situated in the Sanghar district of Sindh province and is licensed to Oil and Gas Development Corporation Limited (OGDCL). The seismic data for this dissertation was provided by the Land Mark Resources (LMKR) by the permission of Directorate General of Petroleum Concessions (DGPC). The data comprised ten seismic lines, base map, and VSP of well Chak 7A-01. The lines which were used are (886-SGR-347, 896-SGR-389, 896-SGR-350, 947-SGR-283N, 947-SGR-278N, 936-SGR-122, 896-SGR-393, 896-SGR-394, 886-SGR-391, and 866-SGR-86). Five prominent reflectors (green, red, yellow, pink, and blue) were marked on the basis of their reflection, which represent Chiltan, Basal Sands (one of the sand shale packages of Lower Goru), Top Lower Goru (TLG), Upper Goru, and Parh limestone formations respectively. Two-way time (TWT) from the seismic sections and average velocities were used to create TWT and Depth Contour maps and 3D Time and Depth Surfaces of Basal sands and TLG. In the end, by the examination of the maps and surface models, leads were identified and well locations were proposed.