2D INTEGRATED SEISMIC INTERPRETATION, PETROPHYSICAL ANALYSIS, ROCK PHYSICS BASED FACIES ANALYSIS , CRUSTAL SHORTENING, VELOCITY MODEL BUILDING . & MODEL-BASED INVERSION ANALYSIS OF MISSAKESWAL AREA, UPPER INDUS BASIN PAKSITAN .

Abstract

The present study pertains to the modeling of the productive zones from seismic and well log data. This was carried out by seismic lines GNA-14, GJN-16, GJN-26 and well logs data (LAS format) of Missakeswal-03 provided by the Directorate General of Petroleum Concession (DGPC). The area is a part of Potwar sub-basin. The area is important for its hydrocarbon (oil and gas) structural traps. Missakeswal oil field is located at the distance of 60 kms in the South- East of Islamabad. The field was discovered in June 1991 and came on regular production from December 1992. The seismic interpretation shows pop-up structures bounded by thrust faults. After time to depth conversion the true structural geometry is obtained in the form of depth sections. The horizons were identified using formation tops from wells and their depths were confirmed through correlation with synthetic seismogram from Density log (RHOB) and Sonic log. Time, depth and horizon velocity contour maps of the horizons of interest have been generated to understand the spatial geometry of the structures. Crustal shortening analysis has also been carried out on the depth section which indicates a compressional regime. Seismic structural model shows major thrust faults, which confirm the compressional tectonic regime in the study area. The petrophysical analysis for the selected zones of the interest shows reservoir quality. 2-D seismic model and synthetic seismic model confirms the position and depth of the marked horizons, relief and structural configuration of the study area. Rock Physics cross-sections have generated to further confirm the interpretation