India’s Hydrocarbon Outlook 2024 57 A Report on Exploration & Production Activities 9. BENGAL-PURNEA BASIN Bengal-Purnea is a Category III basin, implying that the basin has largely undiscovered inplace, that calls for intense exploration for a potential discovery. Bengal-Purnea basin has three sub-basins namely Bengal onland, Bengal offshore and Purnea onland. The basin is situated along the East Coast of Indian peninsula. The onland sub-basin has established both oil and gas discoveries. The offshore part of basin has two-third of potential lying in Middle Miocene play and six gas discoveries are notified. Occurrence of Channelized deposits associated to subtle structures in the east-central area can be significant exploration targets. In the basin, some biogenic gas shows are reported from the Tertiary stratigraphic Source: DGH Internal Source: DGH Internal Onland sub-basin partially overlaps with the state(s) of Odisha and West Bengal. Purnea sub-basin partially overlaps with the state(s) of Bihar and West Bengal. interval ranging from the oldest sediments of Paleogene to the youngest sediments of Miocene-Pliocene complex, which are geographically distributed majorly over offshore areas. This basin hosts a thick pile of sediments of 10,000 m and more, ranging from PermoTriassic to Recent. The basin’s onland part is mostly covered by the Mesozoic sediments, overlain by the thick Tertiary sediments comprising of Paleocene to Recent sediments, mainly deposited by the Ganga-Brahmaputra river system.
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