Structural Interpretation Using Seismic Attributes and Integration of Synthetic Seismogram with Gravity Anomalies of Deep Gas Bearing Zones of Zamzama Block, Lower Indus Basin, Pakistan

Abstract

A seismic final stack section HPK98A-31. HPK98A-32, HPK98A-33. HPK98A-34, HPK98A-36 ZAMZAMA Block of Dadu Area was provided for this research by the Department of Earth and Environmental Sciences, Bahria University Islamabad through Directorate General of Petroleum Concessions (DGPC). The lines provided are dip and strike lines respectively which trend East-West and North-South. The root mean square and Dix interval velocities at different times were given. Five prominent reflectors were marked on the seismic sections on the basis of observed reflection events. The marked horizons show deformation in the area caused by compression. Based on the reflectors trend a thrust fault is marked within the dip lines. A time section is produced from the seismic section using the SP points and the two-way-times (IWT) of the reflectors and fault. These average velocities are then used to find the depths of the formations for the Depth Section. In this research study the Well data of ZAMZAMA 02 (located in Lower Indus Basin) was obtained from DGPC Sonic Log, Neutron Porosity Log. Density Log. Gamma ray Log. SP Log were analyzed for petrophysical analysis. The logs were used to determine lithology, volume of shale, petrophysical and seismic parameters for reservoir estimation. Based on these studies, it is concluded that the total Gas reserves in last four Zones of the Pab Formation stand 0.17 Trillion Cubic Feet (TCF)