2D Seismic Data Interpretation of Line O/881-CW-08, Eastern Potwar, Pakistan

Abstract

The seismic line 881-CW-08 lies in Joyamair and Chakoaurang area in the south-southeast of the Potwar foreland basin. The length of seismic section is 30 km oriented in NNW to SSE. The data acquisition and processing were done by OGDCL Marking of Prominent reflectors in the seismic section along this line represent Basement (Pre-Cambrian), Chorgali (Upper Eocene) and Kamlial Formations. The depth section was constructed with the help of given velocity information. Depth section shows most probably the thin-skinned deformation in cover rocks ie, a thrust fault propagated fold. This type of structure is formed due to the movement of salt below the cover rocks. Time contour map of the area made by time reading of Chorgali Formation in four seismic sections shows the Joyamair and Chaknaurang anticlines and a long east-west oriented thrust fault. In this area thin-skinned deformation in cover rocks resulted fault bend folds. triangle zones and fault propagated folds and anticlines. These structures form compressional traps for oil and gas accumulation. There are two major breaks in the burial history of the area. One is from Ordovician to Carboniferous because the whole Potwar basin was uplifted during that time. The other is from late Permian to Cretaceous because the rocks from west to east in the Potwar basin were eroded due to significant pre-Paleocene tectonic uplift