India's Hydrocarbon Outlook – 2022-2023

51 DGH: 3 DECADES OF UNLOCKING INDIA'S HYDROCARBON POTENTIAL Prospectivity The Cambay basin has a total hydrocarbon inplace of 2,053 MMTOE, out of which 1,800 MMTOE has been discovered and it includes both commercial and sub-commercial inplace. The remaining, 253 MMTOE, nearly 12% 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 has been built using close-spaced 2D seismic lines. However, the basin has extensive 3D seismic data too. The 2017 resource reassessment study has incorporated 15,000 LKM of 2D seismic data, 670 drilled well information. Data quality is good. Gravity, geochemical, 2D/3D seismic, well data and reports are excellent whilemagnetic data are of good quality. Reliability of results is excellent due to good quality seismic and well data. 3D PSM and Trap Density method have been used to assess hydrocarbon resources. There is good data control to construct 3D static models. Prospectivity for Mesozoic could not be carried out as quality of seismic data below basalts is poor. Paleogene plays in Akholjuni and Gandhar can be focus area. High resolution studies and detailed facies analysis are recommended for strati-structural prospects. The play-level undiscovered (risked) hydrocarbon inplace for Cambay basin is given below: 96 MMTOE 60 MMTOE 28 MMTOE 34 MMTOE 19 MMTOE 5 MMTOE Cenozoic Oligo-Miocene: Cenozoic Eocene (Late): Cenozoic Eocene (Middle): Cenozoic Eocene (Early): Cenozoic Paleocene (Late): Cenozoic Paleocene (Early): Mesozoic Cretaceous (Deccan Trap): 11 MMTOE The onland part of the basin is spread into the state(s) of Gujarat, Rajasthan. Status, available datasets and opportunities In terms of awarded acreage that are now active in Cambay basin, 5,806 sq km are under Nomination, 1,408 sq km are in producing fields under Pre-NELP/NELP, 2,922 sq km lie under NELP, 12,402 sq km are under HELP and 1,192 sqkm lie under DSF. Under National Seismic Programme, conducted during 2016-22 in unappraised onland areas, 1,469 LKM broad-band 2D seismic data were acquired in the basin. As of March 1, 2023, NDR, for Cambay basin has archived 119,750 LKM of 2D seismic data, 44,349 SKM of 3D seismic data, 9,066 drilled well information. Under OALP Bid Round VIII, one block of 189 sq km area has been offered. Under OALP IX Mega Round too, another block of 714 sq km area has been put on offer. GUJARAT RAJASTHAN MAHARASHTRA 0 20 40 60 80 10 KM CAMBAY BASIN GUJARAT LEGEND PRODUCING FIELD NELP BLOCK NOMINATION PML DSF BLOCK HELP BLOCK 2D SEISMIC 3D SEISMIC WELLS ONLAND BASIN SEDIMENTARY BASIN SHALLOW WATER BASIN DGH Internal