Characterization of Balkassar area using 2d seismic and well data

Abstract

The dissertation work includes interpretation of seismic data, Petrophysical analysis using well logs data, facies identification, rock physics as well use of seismic inversion to estimate physical properties of rocks. The study area selected for tlus purpose is Balkassar area (Upper Indus Basin) Pakistan. The purpose of tills research is to study structural variations of subsurface using seismic and well log data of Balkassar area. The data used for this work consist of 3 seismic lines i.e two dip and a strike line. The area is a part of Potwar sub-basin which is known for its hydrocarbon structural traps. Patala formation acts as a source rock, Chorgali and Sakesar formation acts a reservoir rock whereas Murree formation acts a seal/cap rock. The seismic interpretation shows anticline structures bounded by thrust faults. Two-way fault bounded closure is clearly observed on the time and depth Contour maps which confirms the presence of pop up structure in the study area. Petrophysical analysis of well BALKASSAR-OXY -01 is carried out fo r Chorgali and Sakesar in order to depict the probable hydrocarbon producing reservoir. I have marked one zone in chorgali fonnation having water saturation 33% and hydrocarbon saturation being 67%. Three probable zones were marked in sakesar fom1ation among which zone C have water saturation 29% and hydrocarbon saturation 71 %. In rock physics plots of elastic moduli with reservoir depth shows low values of moduli in productive zone willch also confirm our Petrophysical interpretation In facies analysis different crossplots were generated to confirm the dominant lithology of our reservoirs which tum out to be lin1estone. Colored inversion results are also demonstrating that Chorgali and sakesar act as a reservoir. On inverted section Chorgali and Sakesar shows low value of impedance