Abstract:
The present study area of Gupchani is located in Nawabshah block of
Southern Indus Basin, Pakistan which is located in the southwestern periphery of
Indian plate. Regional tectonics of area indicates deformation caused by extensional
forces during the rifting phase of Indo-Australian plate from Gondwanaland. These
forces caused the formation of various normal faults in the area that resulted in the
displacement of strata of widely varying ages in close proximity throughout Southern
Indus Basin. The faults also resulted in the formation of some structural traps in the
area.
The dissertation focuses on delineating those subsurface structures and
analyzing the resulting displacement utilizing contour maps for time and depth. 2D
seismic interpretation is carried out manually on the study area and Time and Depth
contour maps are generated. Moreover the petrophysical properties of the area are
studied to determine the hydrocarbon potential in order to carry out the structural and
stratigraphic interpretation of Gupchani area. Four dip lines and one strike line were
interpreted. TWT and depth mapping helped in delineating the structural trend and
understanding the tectonics of the area. Subsurface mapping reveals that the major
fault trend is NNW-SSE. Tectonic activity continued throughout the deposition of
Lower Goru – Khadro level. Existing structural trend of the area provides basic
component of a profile petroleum system.
The outcomes of study concluded that the area has few normal faults that have
caused displacement of strata. Petrophysical analysis reveals that the rock properties
of Chiltan and sands of Lower Goru are suitable to act as reservoir. Faults are also
helping in the formation of hydrocarbon traps. The main constituents of petroleum
system are present but there is still a requirement of advance techniques to improve
seismic resolution and quality of interpretation.
