Fatimatuzz Zohora Farzana, Rashed Abdullah

The Rashidpur anticline, trending N-S, is a surface
anticline with reverse faulting located in an area characterised
by low hillocks. It is part of the youngest structural province
along the western flank of the Indo-Burman Ranges, formed by
the oblique subduction of the Indian plate beneath the Burmese
plate. Many folds in the area are influenced by faults along their
axes. Seismic transect analysis and wireline log data reveal four
main reflecting horizons: Lower Gas Sand, Top Bhuban, and
Upper Marine Shale. Time contour maps for these horizons show
that the Rashidpur structure is an N-S trending asymmetrical
anticline with a steep eastern flank. The eastern flank is thrusted
and associated with west-dipping faults, though some structures
exhibit pop-up features. Well log interpretation identifies gasbearing sands within the Dupitila to Bhuban Formations.
The onlapping geometry and thinning of reflectors toward the
anticline crest correspond to the Pliocene Tipam and Pleistocene
Dupitila Groups, while the base corresponds to the Surma
Groups. This structure is interpreted as a syn-kinematic package,
indicating that the structural development began in the Miocene.
Seismic data interpretation and well information suggest that
Rashidpur is a fault propagation fold. Both 2D seismic sections
and time contour maps indicate fault-bounded closures to the
east, previously unreported. These prospects should be further
investigated using 3D data and fault seal analysis to assess the
sealing ability of the fault and the potential of fault-bounded
trapping mechanisms in the Rashidpur anticline.