STRUCTURAL MAPPING OF FIMKASSAR OIL FIELD AND ITS CORRELATION WITH SUBSURFACE OIL PRODUCING STRUCTURAL UNITS, POTWAR SUB BASIN, PAKISTAN

Abstract

North Potwar deformed zone (NPDZ) is present in Upper Indus Basin Potwar plateau. The main source of deformation in this zone is Indian plate movement toward north. Potwar basin is the first oldest known basin for commercial hydrocarbon production; when the exploration was only on anticlinal and oil seepage basis (Khaur oilfield 1917).The study area is consisting of Fimkassar oil field and the seismic lines were collected from Landmark Resources (LMKR) with the permission of Directorate General of petroleum concession (DGPC) of Ministry of petroleum and natural resources Islamabad with the help of Earth and environmental sciences department Bahria University Islamabad. The study area consists of Fimkassar well-01, well-02 and well-03 and seismic lines G884-FMK-101, G884-FMK-103, G884-FMK-104, G884- FMK-105, G884-FMK-106, G884-FMK-107 and G884-FMK-108 of the Fimkassar oil field. The 2D seismic study was carried out at OGDCL data interpretation centre for the structural mapping of Fimkassar oil Field and its correlation with subsurface oil producing structure along with the formation contributing for hydrocarbon in deeper horizon of Northern Potwar Deformed Zone. With the help of seismic synform anticline was identified with two major faults trending north east and south west. Oil area was identified in the north east of structure and in the northern part of the known structure a relative smaller high at deeper level was also identified in the south western side of the structure. Time structure maps of the reflectors ware prepared for Chorgali Formation and Sakesar Limestone using two way time of the reflectors. Time structure map was converted into depth contour map for further clarity of the structure.