Reservoir Characterization of the Khipro Area, Lower Indus Basin, Pakistan

Abstract

The present study pertains to the structural and interpretation of Khipro block in order to determine the probable zone for the accumulation of hydrocarbon. The data used for this study consists of seismic data and well logs data of Khipro area which is provided by the Department of Earth Sciences Quaid-i-Azam University Islamabad. Khipro area lay in the Lower Indus Basin is known for its hydrocarbon (oil and gas) structural traps. Surface lithological units’ identification is done using Aster LT-1 data. Preprocessing of data is done which removes noise and other atmospheric anomalies. Then image is interpreted using different image processing techniques such as PCA, MNF and Band Ratioing. For the interpretation of the seismic lines, two reflectors are marked by correlating synthetic seismogram on seismic section. As the area of study lies in the Lower Indus Basin, horst and graben geometry in this region is common which is confirmed by fault polygon, time and depth contours made from time and depth grid respectively. We use well logs data for this study. Petrophysical analysis is carried out to narrow down the promising zones and presence of potential hydrocarbons in the formations of lower Goru sands. Seismic attribute analysis using envelope and instantaneous phase is then applied to confirm both structural and stratigraphic interpretation. Colored inversion is applied to enhance and focus on the layer properties of the marked horizons. Very low acoustic impedance is observed in Lower Goru sands, which could further affirm our results of hydrocarbon presence in the promising zones.