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Hydrocarbon Potential of Neocene Deep-Water Lowstand Sandstone Facies of the Rakhine Basin

Sun, Hui
Hangzhou Research Institute of Petroleum Geology, Hangzhou, China.

Petroleum system analysis and characterization of Eocene-Lower Miocene depositional sequences in the Rakhine basin, involving field reports, core analysis, and seismic interpretation, resulted in the recognition of Miocene-Pliocene depositional sequences. The Miocene-Pliocene depositional history of the Rakhine basin was dominated by deltaic, marginal marine and deepwater sedimentation. The lowstand sandstone facies associated with the Miocene to Lower Pliocene depositional sequences have potential as reservoirs in the offshore of the Rakhine basin. The deepwater sediments of the basin are effected by a slope-floor depositional system that progressively migrated westwards into the Bay of Bengal in west of the accretionary wedge front. These potential reservoir facies are predicted to occur in deepwater settings as frontal splay and channel sandstone accumulations. Of these potential hydrocarbon targets, the amalgamated sheets in frontal splays of Pliocene appear to have the highest reservoir potential of several deepwater architecture elements.

Three structural zones including steep folded belt, gentle folded belt and abyssal plain exist in the offshore of the Rakhine basin from east to west, that are associated with the distribution of petroleum reservoir. The petroleum source rocks are probably

Oligocene-Lower Miocene beds because of analysis from several rock samples in the Rakhine basin. These begun gas generation and expulsion during the Pliocene.

Therefore, the sedimentary, geochemical, and structure of the Oligocene-Pliocene strata give the Rakhine basin deepwater sandstone facies a high priority as a potential petroleum reservoir target in the Rakhine basin.


AAPG Search and Discovery Article #90155©2012 AAPG International Conference & Exhibition, Singapore, 16-19 September 2012