SEISMIC INTERPRETATION, PETROPHYSICS AND COLORED INVERSION OF FIMKASSAR AREA, UPPER INDUS BASIN, PAKISTAN

Abstract

The dissertation work includes seismic data interpretation, Petro physical analysis using well logs data; identification of possible resource plays as well use of seismic inversion to estimate physical properties of rocks. Seismic and well log interpretation used for study of structural style, physical properties of rocks and identification of possible petroleum system of Fimkassar area (Upper Indus Basin) Pakistan. Well locations are proposed by constructing time and a depth contour map which shows faulted anticline in study area, two leads are shown on these contours. These two leads are marked on Chorgali, Sakesar and Patala Formations. Petrophysical analysis of wells TURKWAL-01 is carried out for Chorgali, Sakesar and Patala Formations in order to depict the probable hydrocarbon producing reservoir. The results suggest that both Chorgali and Sakesar Formations are more producing as compared to Nammal Formation which is less productive because of alternating shale limestone lithologies. Patala Formation is found to be mature source rock with in some wells of study area, while Nammal Formation consists of immature organic content. The lower part of Sakesar Formation shows indication of maturity or reservoir shale. Seismic inversion results are also demonstrating that Chorgali act as a reservoir. The post stack color inversion is performed to confirm the leads location. On inverted section Chorgali shows low value of impedance i.e. strong indicator for the presence of hydrocarbons.