2D seismic interpretation of Fort Abbas area, Punjab Platform, Central Indus basin Pakistan (P-1058) (MFN 3022)

Abstract

The basic objective of the study is to get preliminary understanding and knowledge of the subsurface structures trend and stratigraphy of the cited area. Seismic interpretation eventually resulted in outcomes as time and depth contour maps, which assisted to understand the subsurface structures for further exploration. Fort Abbas concession is part of Punjab platform which is a gentle eastward monoclonal rise at the central Indus Basin. Seismic lines 921-FABS-01, 921-FABS- 04, 921-FABS-05 and 931-FABS-16A shot by OGDCL in year 1993-1994 in Fort Abbas area. The seismic lines under study area are dip and strike lines. Seismic line 931-FABS-16A is a dip line that passes from the well (Fort Abbas-01). Other seismic lines are dip lines. Drilling of Fort Abbas Well No. 1 was carried out to test the hydrocarbon potentials of Kussak and Khewra (Cambrian) and Salt Range Formation of Pre-Cambrian. Two prominent reflectors namely Sakesar and Kussak Formations were marked on the seismic sections on the basis of depth and velocity information of these formations. Time contour maps of the reflectors were produced using two way time of the reflectors. Average velocities were used to find the depths of the formations for the seismic sections. Based on these seismic maps the structure of the area was interpreted as a gently dipping broad monocline.