India's Hydrocarbon Outlook – 2022-2023

60 DGH: 3 DECADES OF UNLOCKING INDIA'S HYDROCARBON POTENTIAL Mahanadi is a Category II basin, implying that the basin has sub-commercial discovered inplace. The basin has an area of 99,500 sq. km. with 15,500 sq. km. onland area, 14,211 sq. km. shallow water area and 69,789 sq. km. deepwater area. In the basin, 8 plays exist within Cretaceous- Tertiary. 11. MAHANADI BASIN DGH Internal DGH Archive Prospectivity The Mahanadi basin has a total hydrocarbon inplace of 398 MMTOE, out of which 77 MMTOE has been discovered and this is now entirely sub-commercial inplace. The remaining, 321 MMTOE, nearly 81% of total inplace is potential to be explored and discovered. The basin has been assessed earlier during 1995- 96 study along with 14 other basins. During 2017 Hydrocarbon Resource Assessment Study, 3D PSM approach has been used due to availability of adequate datasets. The 2017 resource reassessment study has incorporated 27,843 LKM of 2D seismic data, 6,309 SKM of 3D seismic data, 46 drilled well information. Data are clustered near shelfal part of offshore while deeper plays do have less data. Gravity, 2D seismic data and reports are good data. Very scanty data for deeper plays and deepwater areas are a few challenges. Model results show good potential towards northeast part of offshore adjoining Bengal offshore. High resolution seismic acquisition to delineate deeper plays and future exploration in high pressure area are recommended. while magnetic, geochemical, 3D seismic and well data are fair. Reliability of results is good. Cretaceous sequence of KG basin. has been used as analogue. 3D PSM and Trap Density method have been used to assess hydrocarbon resources due to fair-to-good control of seismic