India's Hydrocarbon Outlook – 2022-2023

79 DGH: 3 DECADES OF UNLOCKING INDIA'S HYDROCARBON POTENTIAL Chhattisgarh is a Category III basin and it has an area of 32,000 sq. km. which is entirely onland. In the basin, 1 play is known in Pre- Cambrian. The basin is located over the Bastar craton of Peninsular India. The basin has inadequate geoscientific data and the elements of petroleumsystem in the basin are largely speculative. The basin is bounded by the Kotri-Dongargarh orogen and Satpura mobile belt towards west and north while Gondwana graben of Mahanadi and the Eastern Ghats mobile belt mark the north-eastern and south- eastern limits. Basement gneisses along with the rocks of Sonakhan greenstone belt forms the basin floor for Proterozoic sedimentation. Entire Proterozoic sequence of the basin has been considered as a single Proterozoic Play and sub-divided into four assessment units based on geological rationales. Paleo- to-Meso- Proterozoic Basuhari-Rhotas play of Vindhyan Basin is considered a close analogue. Prospectivity The Chhattisgarh basin has a total hydrocarbon inplace of 25 MMTOE, which is entirely undiscovered and potential for intense exploration. The basin has been assessed for the first time. During 2017 Hydrocarbon Resource Assessment Study, Aerial Yield approach has been used on analogy of Vindhyan Basin. The basin has 2,500m envisaged sedimentary thickness. Geological map, GM data, geochemical survey (analysis of adsorbed gas on few samples) have been used in the study. Gravity data are of good quality; Magnetic, reports are of fair quality; Geochemical data are poor with no availability of seismic and well data. The data reliability is good. Vindhyan Basin. has been used as analogue. Inadequate geoscientific data leads to adopting areal yield method to assess the hydrocarbon resources. No subsurface information is available. Focus should be made to the sediment below the basalt. Results may be reviewed as and when new sets of data are available. 19. CHHATTISGARH BASIN DGH Internal DGH Archive