Abstract:
The Badin Concession in southeastern Pakistan has been a prolific producer of
hydrocarbons for more than 20 years, with more than 500 MMBO (Million Barrels of
Oil) equivalents of oil and gas found to date. Badin lies in an extensional tectonic
regime which includes tilted fault blocks, normal faulting, horst and graben structures.
Being a petroleum province the petroleum system of this area is proven and there is
no issue of source, seal, reservoir and charge. Any structure which is positively
identified on seismic has a good chance of success. In this research project, an
integrated approach, utilizing geological, geophysical and economical interpretational
procedures, was carried out to delineate the possible sweet spots in the southern part
of Badin area. A sparse grid of vintage 2D seismic data was selected which was
interpreted on Upper, Middle and Basal Sand packages of Lower Goru Sands, as well
as Chiltan Limestone levels. Seismic picks were verified by ‘Forward Modeling’ and
‘Well Tops Correlation’ techniques. End result was the preparation of ‘Two Way
Time Maps’ and ‘Depth Structure Maps’ of the above mentioned horizons. Several
leads were identified and were subjected to detailed geophysical and petrophysical
analysis, in which some leads were eliminated while others were upgraded into
prospects. Geophysical analysis indicated the area, extent and reliability of the
structures with respect to data quality of the seismic data. The petrophysical analysis
indicated the prospective reservoir part of the Upper Sands of Lower Goru Formation
thinning and subsequently truncating towards east. This included detailed
petrophysical interpretation of Keyhole-01 and Doti-01 well, as well as structural and
stratigraphic correlations of Pirshah-01, Keyhole-01 and Doti-01 wells. Doti-01 well
was used as a reference well for future prospects for Upper Sands. Six prospects (AShallow,
A-Deep, B-Shallow, B-Deep, C-Deep and D-Deep) were delineated and then
evaluated which included detailed risk analysis and volumetric analysis. This was
followed by an economical analysis which included the accessibility, petroleum
infrastructure, pricing, taxes, royalties and political situation. Finally the selected
prospects were ranked on the basis of highest chances of success and nominal cost as
compared to the other drillable prospects. The outcome of this research study provides
the basis of multidisciplinary data integration to delineate a prospective structure with
confidence.
