2D SEISMIC INTERPRETATION OF REFLECTION DATA OF LINE 986BTM-13

Abstract

Seismic line 986-BTM-13 was given me by the department of Earth & Environmental Science; for interpretation. The seismic reflection data in study area of Biterisum was acquired by Oil & Gas development Corporation Limited. The given seismic line covers refection data from shot points 110-280. The given seismic line is a dip line which runs in area as NW-SE direction. Root mean square velocity, Dix interval velocity, Dix average velocity data is initially conducted and I did detailed velocity analysis by interpolating velocities data at all time domain points and completed all velocity windows for 5 seconds time of seismic activity at this line. The prominent reflection patterns define three reflectors with four faults are marked on the seismic section. Basement rocks reflector is absent due to low quality of data resolution. Basic Seismic Maps includes Time section and Depth section of seismic line BTM-13. Seismic time section is prepared by reading Two Way Time (TWT) of each reflector at every shot point. Root mean square velocity data and half of TWT define depths of each reflector. A plot of depth verses shot points results the depth section of seismic line BTM-13. Both time- and depth- section represent similar patterns of horizons and faults. Then, I work out petrophysical parameters i.e. density of rocks, poisson’s ratio, bulks modulus, shear modulus etc. All the quantitative analysis provides sufficient help in constructing geological interpretation of the area. But limitations are there in interpretation because of non-access of various well logs and utilization of high resolution seismic softwares.