Abstract:
Balkassar anticline. A 2-D seismic survey was carried out in 1981 to explore the
deeper potential of the sedimentary sequence i.e. Khewra Sandstone of Early Cambrian
age. The 2D seismic data, consisting of seismic lines PBJ-01, PBJ-02, PBJ-03, PBJ-04,
PBJ-05, PBJ-06, PBJ-07 PBJ-08, PBJ-09, PBJ-10 and PBJ-11 and three wells, Balkassar
Oxy-1, Balkassar-08 and Balkassar-07 are used in the study.
Two dimensional seismic interpretations have been carried out in the upper Indus
Basin, Balkassar area to map subsurface structure. Seismic interpretation is confirmed by
2-D seismic modeling. Crustal shortening is used to determine tectonic regime and to
study the Eocene limestone’s accumulations in Balkassar Oil Field, and to examine how
they were impacted by tectonics. Furthur seismic attribute analysis is carried out to
identify prospect zone and to aid interpretation. Engineering properties evaluation is done
using rock physics study. Confirmation of prospect zone is done by petro physical
analysis. Lithology, porosity, water saturation and hydrocarbon saturation indicate two
productive zones, Chorgali and sakesar zone. Average value of porosity ranges from 1 to
4% and 1-3%, water saturation from 4-7% and 3-4%, and hydrocarbon saturation from 4-
6% and 2-3% for Chorgali and Sakesar zone respectively.
