INTEGRATED SEISMIC INTERPETATION, PETROPHYSICAL ANALYSIS ALONG WITH COLORED INVERSION OF BALKASAR AREA , UPPER INDUS BASIN

Abstract

The dissertation work includes seismic data interpretation, Petrophysical analysis using well logs data; for the identification of possible possible prospect (H.C) zones with the use of seismic inversion. Two-dimensional seismic data interpretation has been carried out in Upper Indus Basin, Balkassar area to confirm the reservoir characteristics of Chorgali and Sakesar Formation. Time and Depth contour maps of Chorgali and Sakesar help us to confirm the presence of anticlinal structure in the given area. Surface contour maps of Chorgali and Sakesar Formation give the real shape of sub-surface structure, which is anticlinal. This anticlinal structure acts as a trap in the area, which is best for hydrocarbon accumulation. Petrophysical analysis of well BALKASSAR OXY-01 is carried out for Chorgali, Sakesar formations in order to depict the probable hydrocarbon producing zones. The results suggest that both Chorgali and Sakesar Formations are producing reservoirs, we marked one zone in Chorgali having VSH 9%, PHIE 4%, SW 31% and H.C Saturation 69% and three zones in Sakesar having VSH 14-16%, PHIE 1.5-3%, SW 55-71% and H.C Saturation 29-45% which is most prominent and possible hydrocarbon zones. No major zones can be selected for production testing results as indicated by the high values of water saturation. Seismic inversion results are also demonstrating that Chorgali and Sakesar act as a reservoir. The post stack colored inversion is performed to confirm the leads location. On inverted section Chorgali and Sakesar shows low value of impedance i.e. strong indicator for the presence of hydrocarbons, it is also confirmed from Petrophysical results.