Structural Interpretation Of Fimkassar Potwar Sub Basin, Pakistan Based On 2-D Seismic Data

Abstract

Fimkassar, formerly known as Parhal, field is in southern Potwar on OGDC's Fimkassar concession in Punjab's Chakwal District. The structure is located in southeastern Potwar and has a 23 by 13 km northeast-southwest trending surface expression with a vertical closure of 1,800-1,900 m. At the Eocene level areal extent is 45 sq km and vertical closure is 58 m, with an additional 230 m due to vertical fault relief. The areal closure is comprised of 7.5 sq km crystal and 37.5 sq km fault-related closure. Gulf Oil declared Fimkassar 1X an oil discovery in June 1981. TDs were 2,730 m (hole A), 2,253 m (sidetrack hole A), 3,081 m (hole B), and 2,360 m (sidetrack hole B). The well is an oil producer from Chorgali limestone at 2,891-3,081 m. Original reserves were 30 million bbl, and 1994 production was 2,562 b/d of oil. The basic objective of the study is to get a preliminary understanding and knowledge of the subsurface structure trend and stratigraphy of the cited area. Seismic interpretation eventually resulted in outcomes such as time and depth contour maps, which assisted in understanding the subsurface structure for further exploration.