2D Seismic Interpretation and Petrophysical Analysis of Balkassar Oil Field, Upper Indus Basin, Pakistan

Abstract

The Balkassar oilfield is one of the major hydrocarbon producing field in Potwar Plateau, Upper Indus Basin Pakistan. This field has been producing both oil and gas from tectonically fractured carbonates deposits of Eocene age. Using six seismic lines and one well data we delineate the hydrocarbon potential of the Balkassar area by 2D seismic interpretation and petrophysical analysis that has been carried out and is represented in the current study. Most of the structural traps in Balkassar area are due to the oldest salt range formation in which the salt diapirism is responsible for the formation of these traps. The direction of deformation is in north-west/south-east. The main productive reservoir formations of Balkassar area are Chorgali Formation and Sakessar Limestone which are being charged by shales of Patala Formation of Paleocene age. .Identification of formation is done through seismic section based on time-depth chart and well tops. The major thrust and back thrust are a structural trap bounded by the anticline and the clays of Murree Formation act as a seal rock.