2D SEISMIC INTERPRETATION USING ROCK PHYSICS AND PETROPHYSICS STUDY OF TAJJAL AREA, LOWER INDUS BASIN PAKISTAN

Abstract

The study locale is Tajjal and is located in Sindh province of Pakistan. It lies at the boundary of lower and central Indus Basin. In order to interpret the subsurface picture, 2D seismic time profile data of four migrated seismic lines (SEG-Y Format) and three wells i.e. KADANWARI-01, KADANWARI-10 and KADANWARI-11 (LAS file) is used. The locale has been identified as extensional regime and the main reservoir is Lower Goru Formation especially its B-Sand interval. Seismic Interpretation of Tajjal area involves 04 Seismic Lines. The seismic data acquisition and processing was carried out by LASMO OIL PAKISTAN. These lines have been interpreted on the basis of Seismic Interpretation criteria. Generation of synthetic seismogram is achieved by using two way time for each well top. Two way time for each well top or reflector is calculated by using depth, sonic log data of well and replacement velocity of the area tie this synthetic seismogram with the Seismic line (TJ89-516) on which well is located (KADANWARI-01). With the help of synthetic seismogram three horizons i.e. Sui Main Limestone, Ranikot and Lower Goru Formation were marked on lines TJ89-503, TJ89-510, TJ89-516 and TJ89-526 and Normal faults are observed. Models of elastic properties derived from the sonic velocity of well confirm that the Lower Goru formation is initially comprised of intervals of Sandstone and Shale along with fluid substitution as indicated by high and low values of Rock Physical parameters