2D SEISMIC REFLECTION DATA INTERPRETATION OF MIANWALI AREA IN PAKISTAN

Abstract

The department provided the migrated seIsmIC section of Mianwali area of Pakistan. The aim of this dissertation is to interpret this seismic reflection data. This is a migrated processed 30 fold seismic section of line # 904-MWI-8A. The length of seismic line is 38.25 Ian and is oriented in direction SE-NW .The data acquisition as well as processing was done by OGDCL. For the interpretation of this seismic data, three reflectors are marked on the basis of prominent reflection and change in lithology. The velocity information in the form of RMS and interval velocities at different CDPs is provided, from which the average velocities at these time are calculated with the help of Dix formula. Using respective time and velocity estimate he depth of each reflector was calculated. The depth section is then plotted between depth of each reflector and shot points.The well log data of Kundian-Ol and stratigraphical information of the area a reliable subsurface geological model has been formulated. This shows that reflectors have gentle slope and dipping with low angle tqwards NW.R2 is recognized an unconformity on the basis of well log data, Stratigraphy of the area and presence of pinch outs. The sequence present above unconformity is correlated to Siwalik Group comprising of . . Chindi and Nagri formations. While sequences below unconformity are Pelmian strata: Sedimentary column is thin towards south and there is uplifting towards south of the area due to Sargodha high, where formations are pinching out.Many faults are present which are mostly normal faults.