Abstract:
The Pindori oil field is situated about 67 km south west of Rawalpindi in the
south east of Potwar Basin. Structurally, it lies about 16 km northwest of Turkhawal field
and 18km west of Bhangali field. Stratigraphically, it lies in the upper Indus basin which
is characterized by large number of reverse and thrust faults producing asymmetrical
structures (anticlines/synclines). This thesis throws a light on model based inversion
using 2D seismic interpretation and well log analysis, in order to delineate the subsurface
structure and hydrocarbon potential of Pindori area. The kingdom software is used for 2D
seismic interpretation and the output is obtained in the form of depth structure maps. The
depth structure map reveals the presence of fault bounded anticlines surrounded by
broader synclines. The subsurface geology reveals that Patala Formation of Paleocene
age is acting as a source rock whereas Chorgali Formation and Sakesar Limestone of
Eocene age are acting as reservoirs and Murree Formation of Miocene age is acting as a
seal. The petrophysical analysis of the Pindori-1, Pindori-2 and Pindori-3 wells is done
using geographics software in order to delineate the potential hydrocarbon bearing zones in these wells. The log analysis shows the average effective porosity range of 7-15%, average water saturation range of 26-42% and average hydrocarbon saturation of 58-74% in Chorgali Formation and average effective porosity of 7.7-12%, average water
saturation of 27-36% and average hydrocarbon saturation of 44-73% in Sakesar
Limestone. The seismic based model inversion is done in order to find out the porosities
of the formations in the subsurface. The result is obtained in the form of velocity inverted
section which shows that the velocity in the subsurface is increasing with increasing
depth and the porosities are decreasing.
