Hydrocarbon Reservoir Evaluation and Fault Seal Analysis of Balkassar Area, Potwar Sub Basin, Pakistan


  • U. Shakir Bahria University, Islamabad campus
  • M. Abbas Bahria University, Student
  • W. Ahmad National Center of Physics, Earthquake Studies
  • M. F. Mahmood Bahria University, Assistant professor
  • M. Hussain LMK Resources
  • M. Anwar Bahria University, Islamabad
  • U. Sikandar Bahria University, Student
  • T. Naseem bahria University, Student


Balkassar oilfield is one of the major hydrocarbon producing field in Potwar Plateau, Upper Indus
Basin, Pakistan. This field has been producing oil and gas from fractured carbonate deposits of Eocene
and Paleocene age. So, in order to delineate the hydrocarbon potential of the Balkassar area, 2D seismic
interpretation and petrophysical analysis has been carried out and is represented in the current study
using five seismic lines and one well. Balkassar field is geographically located in central part of Potwar
Sub-basin. Geologically it is located in Himalayan foreland fold and thrust belt, which is dominated by
thrusting and folding features. The salt tectonics is responsible for the formation of structural traps in
Balkassar area. The direction of deformation is in NW- SE direction. The main reservoir formations of
Balkassar area are Chorgali Formation and Sakesar Limestone which are charged by shales of Patala
Formation of Paleocene age. Formations were identified on the seismic section on the basis of timedepth
chart and well tops. Petroleum trap is a structural trap where major thrust and back thrust bound
the anticline, and sealing impact is provided by both clays of Murree Formation and faults which is
further confirmed through fault seal analysis (Allan diagram). One reservoir zone has been identified in
Chorgali Formation using petrophysical analysis, which indicates effective porosity of 3.08%, 40.5%
water saturation and 59.5% hydrocarbon saturation. Based on the statistical analysis performed, it is
concluded that the Chorgali Formation is more economically promising as compared to Sakesar
Limestone. Volumetric reserves calculation is done to estimate the volume of original oil in place (OOIP)
for the Chorgali Formation, which comes out to be 18.6 Million Barrels for P90 case.

Author Biographies

U. Shakir, Bahria University, Islamabad campus

Department of earth and Environmental sciences, Assistant professor

M. Abbas, Bahria University, Student

Department of earth and Environmental sciences,

W. Ahmad, National Center of Physics, Earthquake Studies

Center of Earth Quake Studies, Senior Scientist

M. F. Mahmood, Bahria University, Assistant professor

Department of earth and Environmental sciences, Assistant professor

M. Hussain, LMK Resources

Jinnah Avenue, Blue Area, Islamabad

M. Anwar, Bahria University, Islamabad

Deptt of Earth and Environ. Sci.

U. Sikandar, Bahria University, Student

Department of earth and Environmental sciences,

T. Naseem, bahria University, Student

Department of earth and Environmental sciences, Student


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How to Cite

U. Shakir, “Hydrocarbon Reservoir Evaluation and Fault Seal Analysis of Balkassar Area, Potwar Sub Basin, Pakistan”, The Nucleus, vol. 56, no. 3, pp. 96–104, Feb. 2020.