2-D SEISMIC REFLECTION DATA INTERPRETATION OF LINE 985-QPR-04

Abstract

A seismic reflection line 985 -QPR-04 of Qadirpur area (Sindh Province) was provided by the department of Earth Sciences, Quaid-e-Azam University for interpretation. The given line is oriented in SE direction. The section comprised of a total of shot points from 200-926, from which SP-200 SP-450 were used in the interpretation. The section is a final stacked migrated section. The root mean square velocity, Dix interval velocity and Dix average velocity at different time were given. Thilteen were present in the allotted shot points, i.e. SP-200, SP-22S, SP-250, SP-275, SP-3 00, SP-325 SP-350 SP-375, SP-400, SP-425, SP-450. Velocity versus time graph was prepared. For seismic section, arrival times (two way) of each marked reflector was determined . Using these arrival times and velocity information, the depth of each reflector was calculated usin g the formula s= (v*t)/2. finally a depth section was constructed. This depth section provides a reliable picture of renectors present in the subsurface. In total seven prom inent reflectors were marked and then interpreted. The three normal faults were marked . Due to extensional regime normal faults, Horst and Graben structure arc found in the depth section.