India's Hydrocarbon Outlook – 2022-2023

63 DGH: 3 DECADES OF UNLOCKING INDIA'S HYDROCARBON POTENTIAL Prospectivity The Andaman basin has a total hydrocarbon inplace of 72 MMTOE, out of which 2 MMTOE has been discovered and this is now entirely sub-commercial inplace. The remaining, 70 MMTOE, nearly 97% 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 and Aerial Yield have been used based on the merit of adequate datasets. The 2017 resource reassessment study has incorporated 55,778 LKM of 2D seismic data, 20,639 SKM of 3D seismic data, 19 drilled well information. GM, geochemical, 3D seismic and well data are fair while 2D seismic data and reports are good. Data quality is good in East Andaman however little data is available in the West Andaman. Reliability of results is good. 3D PSM and Trap Density method have been used to assess hydrocarbon resources due to fair-to- adequate data. Constraint of geochemical data and structural complexity are major challenges. Southeastern area of East Andaman can be considered prospective due to source rock maturity. Detailed interpretation of available high-resolution seismic data would have better insight to complex structural set-up. The play-level undiscovered (risked) hydrocarbon inplace for West area is tabulated below: The play-level undiscovered (risked) hydrocarbon inplace for East area is tabulated below: <1 MMTOE <1 MMTOE 2 MMTOE 33 MMTOE Cenozoic Tertiary: Cenozoic Miocene (Middle): Mesozoic Cretaceous (Upper): Cenozoic Miocene (Early): Cenozoic Oligocene: Cenozoic Eocene: 14 MMTOE 20 MMTOE Status, available datasets and opportunities In terms of awarded acreage that are now active in Andaman basin, 23,245 sq km are under HELP. Under National Seismic Programme, conducted during 2016-22 in unappraised onland areas, 264 LKM broad-band 2D seismic data were acquired in the basin. This, during the next periodical resource study will help explore onland extension of the basin, which is now considered entirely offshore. As of March 1, 2023, NDR, for Andaman basin has archived 205,882 LKM of 2D seismic data, 34,335 SKM of 3D seismic data, 22 drilled well information. In the upcoming Offshore Mega OALP Round IX, there is an opportunity of 53,099 sq km prospective areas in back-arc regions that are carved into four blocks, all located in ultra- deepwater. ANDAMAN & NICOBAR 0 80 160 240 320 40 KM ANDAMAN BASIN LEGEND HELP BLOCK 2D SEISMIC 3D SEISMIC WELLS SEDIMENTARY BASIN SHALLOW WATER BASIN DEEPWATER BASIN DGH Internal