Seismic Data Interpretation of the Rashidpur Anticline: Implications for Structural Analysis and Trapping Mechanisms

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Abstract

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.

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