2D Seismic Interpretation, Petrophysical Analysis and Model Based Velocity Inversion of Pindori area, Upper Indus Basin, Pakistan (T-1524) (MFN 5829)

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.