Prospect Evaluation for Hydrocarbons Using Geological, Geophysical & Well Log Analysis in Kandra Field, Middle Indus Basin, Sind, Pakistan

Abstract

Migrated seismic lines KDR89-01, KDR89-02, KDR89-03, KDR89-04, KDR89-05 of Kandra block were obtained from LMKR after prior permission from Directorate General of Petroleum Concessions (DGPC) for the purpose of seismic interpretation and Well Log analysis of Kandra-01. Dip lines are oriented E-W while Strike lines are oriented N-S. The required information for the seismic interpretation was provided with the seismic sections. Six Horizons were marked which were SML, Ranikot Formation, Top Lower Goru Formation, Middle Sands, Basal Sands, Chiltan limestone. Major faults were identified, which extended through all these formations. TWT and velocity contour maps were generated for these above mentioned horizons. Depth contours were then generated with the help of these contour maps which delineated the subsurface structures and the tectonic activities which took place throughout the geologic past. Depth sections were constructed using cross sections of depth contour maps conforming the subsurface structure is a dome with a grabben near its crest. Source rock is not present in this area as the hydrocarbon traps were most possibly developed in these anticlines and are the prospective zones for hydrocarbon accumulation. Well log analysis was carried out on Kandra 01 to identify reservoir area and evaluate the values for Saturation of water, Volume of shale, Porosities present in the subsurface formation. On the basis of this analysis we discovered two probable hydrocarbon zones in SML and Chiltan formation. Potential Hydrocarbon reserves were estimated using the effective porosity, areal extent of the reservoir, and net pay thickness of the reservoir, for the plausible economic recovery evaluation from the calculated reserves.