COMPLEX VELOCITY MODEL BUILDING OF FIMKASSAR AREA, UPPER INDUS BASIN, PAKISTAN

Abstract

The present study was accompanied to delineate the subsurface geology of Fimkassar area by the structural interpretation of seismic. The Fimkassar area lies within the Upper Indus Basin in SE of Salt range Potwar Foreland Basin. The marked horizons are recognized using Formation tops from wells Turkwal- 01 and Turkwal Deep-01. Seismic interpretation of the given 2D Information reveals that the study area has undergone severe distortion illustrated by the event of thrusts and back thrusts forming a triangle zone within the subsurface showing a pop-up geometry. The zones interpreted by the study includes Khewra Sandstone and Chorgali Formation that could have the most important crude potential within the study area. Velocity modelling was carried out on all seismic data which gave more accurate interpolated velocity according to geological cross section of area. The interpolated velocity was then used in post stack depth and time migration. The migrated section gave more clear sections with reduced noise and clearer picture of subsurface i.e., faults and horizons were more visible.