INTERPRETATION OF 2D-SEISMIC REFLECTION DATA LINE# 902-SGR-782 IN SANGHAR AREA OF PAKISTAN

Abstract

The seismic section of line no. 902-SGR-782 is provided by OGDC. The data is acquired from the area Sanghar (Sind h) of Pakistan . The line extend ing form shot point 101 -232 in SN direction. The total length of the line between these shot points is 6.5 km . Along with the seismic section the RMS and Dix interval velocities are also provided for different shot points . Using the Dix average velocities, time and shot point distance a Dix average velocity contour map is constructed . The vertical and lateral changes are studied . Also in addition to this mean average velocity map is constructed. By picking accurate velocity against time in this map a depth section is plotted, which shows the correct sub surface structure. Six reflectors R 1, R2, R3, R4, R5 and R6 are marked on the seismic section. The depth for the each reflector were found out, by using average velocity and one way travel time the reflectors are plotted on a depth section, which represents the shapes of the reflectors. Normally the reflectors show very little dip. R1, R2, R4 and R5 are almost horizontal. A geological structure like Horst and Grabben is found in R3.