2D Seismic Interpretation of Pirkoh Gas field located in Sulaiman Range, Central Indus Basin (P-1050) (MFN 3027)

Abstract

The project area lies in the Sulaiman Range, Central Indus Basin. The Pirkoh Gas field is located in Baluchistan province,about 610 kms south west of Islamabad and 100 kms North West of the Sui Gas Field with an elevation of 1115 meters above mean sea level. The seismic lines chosen for interpretation were strike lines 826-PRK-15 and dip 826-PRK-16,816-PRK-09, 816-PRK-03 and 816-PRK-02 lies in the Sulaiman Range. One strike line runs in north direction and four dip lines runs in west east direction. The data acquisition and processing was done by OGDCL. Prominent reflectors were marked on the seismic sections which represent different formations. A time section is produced from the seismic section using the SP and the two way travel time of the reflector.The average velocities were then used to find the depth of each formation for depth section.Three reflectors were marked on the seismic section on the basis of observed reflection events. The marked horizons exhibit deformation in the area caused by compressional tectonics. Subsurface contour mapping were carried out for generating the time and depth contour maps to see extension of respective horizons. Interpretation of seismic section is done on the basis of “ Phantom Horizon Method” and “Jump and Tie Method” because the data quality was poor.Our project area is under compressional regime.On the basis of depth and stratigraphic information of our study area We have given names to horizons R1, R2 and R3 and R1 can probably be Sui main limestone formation, R2 Chiltan,R3 Alozai shale formation.