| Citation: | WU Jianan, WEI Hui, FAN Guozhang, JIA Junmin, MA Hongxia, DING Liangbo, XU Xiaoyong, WANG Hongping, ZHANG Ying, YIN Xingjia, CHEN Hui, SU Ming, WANG Ce, ZHUO Haiteng. Sedimentary and reservoir characteristics of Late Pliocene deep-water depositional units in Rakhine Basin in the Bay of Bengal[J]. Bulletin of Geological Science and Technology, 2024, 43(6): 244-257. doi: 10.19509/j.cnki.dzkq.tb20230577
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In recent years, notable discoveries in deep-water oil and gas exploration have emerged in the Rakhine Basin, located in the northern Bay of Bengal.
In this study, high-resolution 3D seismic data from the Rakhine Basin were used to identify deep-water sedimentary architectural elements, including channels, levees, lobate fans (such as crevasse-splay lobes and distributary channel-lobe complexes), hemipelagic mud, and mass-transport deposits. Alongside drilling logs and sampling results, the reservoir characteristics and exploration potential of channels, levees, and lobes in the wells were further analyzed, and the reservoir hierarchy and spatial distribution were determined.
Notably, the Rakhine Basin is characterized by relatively shallow burial depths, weak compaction, and minimal diagnostic alteration since the Pliocene, positioning channels, levees, and lobate fansas potential exploration targets for shallow biogenic gas. In particular, meandering stacked channels emerge as a high-quality reservoir type due to their thick sediment accumulation, strong connectivity, widespread distribution, and elevated high sand content and porosity.
The research findings can provide important guidance and insights for deep-water oil and gas exploration.
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