Abstract:
The present study pertains to the modeling of the productive zones from
seismic and well log data. This was carried out by seismic lines 926-GJN-15, 926-
GJN-16, 932-GJN-20, 932-GJN-26 and well log data (LAS format) of Missa Keswal
03 provided by the Directorate General of Petroleum Concession. The area is a part of
Potwar sub-basin.
The methodology adopted to accomplish this task includes; structural
interpretation of seismic data, 2-D seismic modeling, crustal shortening, synthetic
seismogram, petrophysical analysis and velocity modeling. Seismic data analysis
includes identification and marking of different lithological horizons and names them
according to the depths after correlation with well data. Seismic structural model
show major thrust faults which confirm the compressional tectonic regime in the
study area. Depth and time contour maps along with velocity maps revealed the
potential zones of hydrocarbon in the area which were marked and confirmed with the
help of seismic data interpretation. The crustal shortening calculated on the seismic
sections of the area under study shows that the crust has shortened over the period of
time. The petrophysical analysis is done by determining porosity, water saturation,
volume of shale, resistivity of water and hydrocarbon content for the selected zones;
the results show good reservoir quality.
The velocity models indicate the importance of lateral velocity variations.
After the time to depth conversion, the reflectors are smoothened out with the help of
spatial and temporal corrections and the depth section can then be used for further
seismic data analysis. The processed velocity model shows better results for further
analysis on structure evaluation and decision making.
