India’s Hydrocarbon Outlook 2024 71 A Report on Exploration & Production Activities Paleogene plays (Akholjuni, Gandhar) and Mesozoic remain the key focus area of the basin. Several source rock units exist ranging from Lower Paleocene (Olpad, TOC: 1.38-5.69%, OM is Type III/II+III), Upper Paleocene (Older Cambay Shales, TOC-2.02-7.35%, OM Type III), Early Eocene (Younger Cambay shale, TOC-1.466.59%, OM Type II+III), Middle Eocene (Mandhali, Kanwa Shales, TOC-2.0-6.12%, OM Type III) and Late Eocene( Ardol/Telwa Shale, TOC-2.37-7.0%, OM Type III). The principle source units are the deltaic, lagoonal and shallow marine shales of the Paleocene to Middle Eocene age, with lesser inputs from lacustrine shales of the Paleocene Olpad Formation. In the basin, 7 plays exist within Basement, Paleocene, Eocene and Miocene. Petroleum system was modelled in 3D basis adequate datasets. Onland sub-basin has a total hydrocarbon inplace of 2,054 MMTOE. This includes discovered in-place of 1,801 MMTOE and undiscovered risked in-place of 253 MMTOE. The discovered in-place is under commercial production. The basin has 12.3% of total inplace, potential to be explored and discovered. Hydrocarbon prospectivity and Basin maturity: Source: DGH Internal Discoveries and Development: 1 discovery was notified during the year under OALP regime in Onland. 11 field development plans were reviewed during the year under Pre-NELP(3), NELP(4), OALP(1) and DSF(3) regime in Onland. 2 field development plans were reviewed during the year under DSF regime in Shallow water. Overview of producing fields: Commercial production in Onland sub-basin commenced in 1958. Major producing fields with cumulative production in parenthesis are namely Gandhar (42 MMT,40 BCM), North Kadi (27 MMT, 2 BCM), Kalol (18 MMT, 12 BCM), Santhal (17 MMT). The sub-basin has 42 fields with 560 wells. The maximum flow rates achieved by any field on record in 2023-24 are, Oil 11,600 BOPD and Gas 1 MMSCMD. Commercial production in Shallow water sub-basin commenced in 2002. Major producing fields with cumulative production in parenthesis are namely CB-OS/2 (7 MMT, 8 BCM). The sub-basin has 2 fields with 29 wells. The maximum flow rates achieved by any field on record in 2023-24 are, Oil 4,300 BOPD.
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