2D SEISMIC INTERPRETATION AND PETROPHYSICAL ANALYSIS OF FORT ABBAS AREA, CENTRAL INDUS BASIN, PAKISTAN

Abstract

The study area is in Bahawalnagar district of Punjab Province which falls in Central Indus Basin, a tectonically stable area. It fell under the operatorship of Oil and Gas Development Company Limited whose acquisition of data and processing was done and then drilled to discover petroleum potential of Infra Cambrian reservoir rocks in 1996. Five migrated seismic lines, two strike and three dip lines along with log suites for well named BIJNOT-01 were obtained from Directorate General of Petroleum Concessions (DGPC).Fort Abbas area lies under extensional tectonic regime. Because of that, normal faults exist in our area and horst and graben structures were formed. Five horizons were marked namely Sui Main Limestone, Parh Formation, Lower Goru Formation, Datta Formation and Khewra Sandstone. After these horizons, faults were marked and then time and depth contours were generated to decipher information regarding tectonic setting of that area and to delineate the subsurface structures.Formations encountered during drilling ranged from Pre-Cambrian to Neogene. The whole information was given in time section which was influential in conversion of time section into depth section. These conversions were essential for interpretation of the study area, which was one of the objectives of this project.Petrophysical analysis from log suits of Bijnot-01 well was performed to determine reservoir characteristics of Parh Formation and Khewra Sandstone which involved selection of zone of interest. By log suite interpretation, volume of shale, sand and porosity were determined.