2D seismic data interpretation of Buzdar block, District Tando Allahyar, Southern Indus basin, Pakistan (P-1046) (MFN 3033)

Abstract

Generally our aim was to understand the tectonics and geology of the Buzdar block along with the interpretation procedure of migrated seismic sections to check out the subsurface structures that may be a possible lead for hydrocarbons. As the area is an extensional regime so we have to mark the faults according to their type and structure they are making. We have to mark the formations by checking the Vertical Seismic Profile (VSP) data. In this study, we did the interpretation of the migrated seismic lines of the 872-SGR-527, 872- SGR -529, 872- SGR -531, 872- SGR -532 of Buzdar block ,District Tando Allahyar, Sindh. This data was obtained from Land Mark Resources (LMKR) by the permission of Directorate General of Petroleum Concession (DGPC) Islamabad. The lines 872- SGR -529, 872- SGR -531, 872- SGR -532 were oriented W-E whereas the line 872-SGR-527 was oriented NW-SE. The information we require was given in the time section which was helpful in the conversion of time into depth. These calculations helped us in subsurface interpretation of the area, which was the basic purpose of this project. Three reflectors were marked named top Khadro Formation, top lower Goru formation and top Chiltan limestone (probable). Faults were marked and then time contour maps were generated, after that, time was converted into depth with the help of well velocity from VSP data for lower Goru formation and average velocity for Chiltan limestone (probable) from regression analysis and, finally, depth contour maps were generated which helped us to know the basic mechanism of tectonic movement in the area.