India’s Hydrocarbon Outlook 2024 58 A Report on Exploration & Production Activities The basin has the close analogy with Gondwana sequence of KG basin. The hydrocarbon accumulations often indicate charging from in-situ shallower biogenic source sequences. The establishment of thermogenic plays (MioPliocene) in recent discoveries in Bengal onland point to potential deep-seated source rocks, that can also charge deeper plays. Hinge zone of Bengal basin remains the exploration priority and the reservoir characterization studies of channel facies are the thrust area. In Purnea subbasin, multiple shale sequences within Tertiary sequence have good TOC to generate hydrocarbon. TOC ranging from 0.352.44 % is observed with Type II/III OM. While Gondwana sediments have Type-III OM with an average TOC 1.9%. Intra-formational sandstones from Permo-Triassic to Pliocene are expected to be part of the reservoir facies. In the basin, 8 plays exist within GondwanaCretaceous-Tertiary in the Onland part. 5 plays are known within Eocene-Pliocene in Offshore part. 3 plays are identified within Gondwana (Karharbari-Barakar-Raniganj) of Purnea subbasin. Petroleum system was modelled in 3D basis adequate datasets. Onland sub-basin has a total hydrocarbon in-place of 220 MMTOE and this is largely undiscovered risked inplace. Offshore sub-basin has a total hydrocarbon in-place of 307 MMTOE and this is entirely undiscovered risked in-place. Purnea sub-basin has a total hydrocarbon in-place of 15 MMTOE and this is entirely undiscovered risked inplace. Commercial production in Bengal sub-basin commenced in 2020. The oil production started from Asokenagar-1 discovery subsequent to implementation of early development scheme in the block WB-ONN-2005/4. Hydrocarbon prospectivity and Basin maturity: Overview of producing fields: Source: DGH Internal
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