Structural interpretation and petrophysical analysis of Bhangali oil field, eastern Potwar, Pakistan (P-1136) (MFN 3997)

Abstract

Bhangali oilfield is located approximately 50 km south-east of Islamabad in Gujjar khan District, Rawalpindi. Bhangali field was discovered in 1989 and started production from Bhangali-01 in October 1989. Purpose of the study is the geoscientific work in the Bhangali oil field using seismic and well log data. The seismic lines cover the Bhangali oil field. Four seismic lines are used for the seismic interpretation. There are three major rocks important for the exploration and production which are Eocene rocks known to be Chorgali Formation and Sakesar Limestone and Paleocene rock for the Lockhart Formation as the zone of interest (ZOI) because of its lithology and productivity of hydrocarbon in the surrounding oil fields. Thrust tectonics made this area important for the hydrocarbon exploration. The one important structural traps is fore thrust on which Bhangali well 01 is present .The fore thrust is correlated with the seismological data which proved its oblique slip nature. Due to thrusting and oblique slip, there is huge fracturing which made the Eocene good reservoir as compare to Paleocene age rocks. The logs are used for the conformation of the seismic interpretation. Eleven thrust faults were marked which show a fault-propagating fold in the form of the anticline of Bhangali. The TWT picked from the seismic section was posted on the base map to make a time contour map and RMS velocities were then used to find the depths of the Formation for the depth contour map. The interpreted seismic sections and the contour maps showed that the area was structurally deformed due to salt decollement and compressional tectonic movement. Salt probably moved into these anticlines due to compressional movements.