DefinePK

Abstract

Folded and faulted structures commonly form migration, trapping and accumulation of hydrocarbons. Seismic data is a significant source for the understanding of subsurface structural trend and lithology in the subsurface. For this purpose, 2 D seismic lines have been interpreted to get stratigraphical and structural information of subsurface. Sakhi Sarwar, Drigri and Kotrun anticlines, lie in the south of Zindapir anticline, a part of N-S trending Safed Koh, which is a first line of folding on the folded flank of Sulaiman foredeep. Study area lies in south of Safed Koh trend, Central Indus Basin. The general stratigraphic horizons were marked on lines 954-FZP-06 and LMT95-09 with the help of well Sakhi Sarwar-01. Seismic line 976-FZP-06 lies in Fazilpur area that shows Sakhi Sarwar anticline with a flower structure present in the core suggesting wrenching along with compression. Time contouring maps of Paleocene, Eocene and Oligocene show that the formations are getting shallow in east. Seismic profiles 914-RPR-03 and 914-RPR-05, lie in NW of Rajanpur area of district D.G. Khan. Reflectors are marked and correlated with the help of wells Drigri-01 and Kotrum-01, located near line 914-RPR-03 and 914-RPR-05 respectively. Depth sections of Drigri and Kotrum anticlines are prepared. These structures lie in the SE of Sakhi Sarwar anticline. Drigri anticline has E-W trend over 17 km approximately and the reverse faults are present on both flanks of a fold. Whereas the cross section of Kotrum anticline shows the amplitude of fold is low suggesting that folding die out at the Southern part. Trend of the fold is NE-SW. Depth sections show that a thickness of sedimentary cover is 8 km approximately. Thickness of Nagri Formation and Chinji Formation (Miocene- Pliocene) is 1700 m approximately. Nari Formation is overlain by Gaj (Vehowa) Formation in the area. Eocene & Paleocene are 1300 m and 800 m thick respectively while the basement is uplifted in the east.