India’s Hydrocarbon Outlook 2024 49 A Report on Exploration & Production Activities 6. MAHANADI BASIN Mahanadi is a Category II basin, implying that the basin has sub-commercial discovered inplace, potential to be commercially produced. The basin is situated along the East Coast of Indian peninsula. Mahanadi basin is significantly appraised with strong analogy with the easterly located Bengal offshore that has numerous small-to-medium discoveries. Deepwater is not enough explored, however discovered Miocene play occurs as discrete and stacked reservoirs, which may require consolidation. Enhanced exploration opportunity exists for the prospective Pliocene plays. Hydrocarbon occurrences spread over the Tertiary stratigraphic sequences ranging from the oldest sediments of Paleogene to the youngest sediments of Miocene-Pliocene. Several biogenic gas fields have been discovered with strati-structural entrapment conditions. Onland sub-basin partially overlaps with the state of Odisha. Source: DGH Internal Source: DGH Internal Though hydrocarbon accumulations often indicate charging from in-situ shallower biogenic source sequences, there are instances where thermogenic accumulations have been established. The basin hosts a thick pile of sediments, mainly ranging from Early Cretaceous to Recent. The basin’s onland part is mostly covered by the Mesozoic sediments which is underlying the Miocene sediments, deposited by the major river system of Mahanadi. Stratigraphic sequences including Gondwanas are reported in some small rift grabens. The basin has the close analogy with Cretaceous sequence of KG basin.
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