India's Hydrocarbon Outlook – 2022-2023

58 DGH: 3 DECADES OF UNLOCKING INDIA'S HYDROCARBON POTENTIAL Vindhyan is a Category II basin, implying that the basin has sub-commercial discovered inplace. The basin has an area of 202,888 sq. km. which is entirely onland. In the basin, 3 plays are present within Pre-Cambrian-to-Paleozoic (Jardepahar- Mohana-Rohtas). Vindhyan Basin, comprising of Son and Chambal sub-basins, occupies the numero uno position amongst all the Proterozoic petroliferous basins of India due to its large areal expanse and vast potential of natural resources. The exploratory efforts for hydrocarbon in the basin commenced in 1970’s, it is only after the initial successes met at Jabera-1, Nohta-2 and Damoh-4, its hydrocarbon potential got revealed gradually. The effort to assess the hydrocarbon resources was fraught with challenges primarily due to patchy and meagre data as nearly one third of the basin remains covered by Deccan Trap basalts, over which no significant data set is available. The discovery made in the Son Valley of Vindhyan Basin was considered as an analogue by itself. An integrated structural and tectonic model for Vindhyan Basin has been prepared and prospectivity of different plays has been evaluated. Entire basin has been divided into eighteen assessment units based outcrop studies provided a lead to identify three discrete petroleum systems. Prospectivity The Vindhyan basin has a total hydrocarbon inplace of 685 MMTOE, out of which 1 MMTOE has been discovered and this is now entirely sub-commercial inplace. The remaining, 684 MMTOE, nearly 100% of total inplace is potential to be explored and discovered. The basin has been assessed for the first time. During 2017 Hydrocarbon Resource Assessment Study, Aerial Yield has been used using intra- basin calibration for each play. The basin has 6 profiles of VSP ("Vertical Seismic Profile") along with Aeromagnetic survey (59,771 stations), GM data (6,001 stations) and 5 profiles of DSS ("Deep Seismic Sounding"). The 2017 resource reassessment study has incorporated 9731 LKM of 2D seismic data, 839 SKM of 3D seismic data, 19 drilled well 10. VINDHYAN BASIN DGH Internal DGH Archive on geological rationales majorly the structural fabric. In the basin, three major stratigraphic horizons ("plays") viz. Rohtas, Mohana and Jardepahar were identified and their extent depicted. Geochemical data and source rock assessments made through drilled well and