Hydrocarbon evaluation and new well prognosis based on seismic and petrophysical analysis of Ghauspur area central Indus basin, Pakistan (T-1486) (MFN 4295)

Abstract

This dissertation presents the 2D seismic interpretation of Ghauspur area in the Central Indus Basin, which is located in the southeastern periphery of the Indian plate. In the present study the most important purpose is to delineate subsurface geology by seismic data interpretation, attribute analysis and to evaluate the potential reservoir formations by petrophysical analysis. The data set includes seven 2D seismic lines and a suite of wireline logs of Indus-1B and Badar South-01. Seismic data analysis comprises identification, marking of reflectors and naming them according to the depths after correlation with the well tops and VSP data. Interpretation of seismic lines shows negative flower structure bounded by two normal faults dipping in the NW to SE. Sui Main Limestone, Sui Upper Limestone and Habib Rahi Limestone have been acting as the reservoir in the area. The petrophysical parameters estimated effective porosity, hydrocarbon saturation and volume of shale used to characterize the reservoir’s potential of the area. Reservoir potential found in well Indus-1B for Sui Main Limestone is average Vshl 29%, total porosity 15.45% and effective porosity 13.19%. Attribute analysis improved geologic visualization and shows well Indus-1B has the presence of hydrocarbon because of low frequency and low amplitude values. On the basis of seismic data interpretation, petrophysical and attribute analyses, a new well location is proposed on the crestal part of the structure i.e. its highest point lies at SP 750 on seismic line GHA94-16 with latitude 27o 53” 51 .024’N and longitude 69o 04” 5.97’E.