India’s Hydrocarbon Outlook 2024 42 A Report on Exploration & Production Activities The basin is situated southerly along the east coast of Indian peninsula. Basin has significant production from Mesozoic and Basement. Ultradeep exploration opportunity is envisaged in undrilled areas in the northeast and southern part towards Gulf of Mannar. Commercial hydrocarbon occurrences, besides basement, are encountered inwide stratigraphic sequences with the oldest sediments of Jurassic. Several oil and gas fields have been discovered with structural, stratigraphic and strati-structural entrapment conditions. The basin hosts thick pile of sediments of the order of 8,000m, ranging from Late Jurassic. The onland part is mostly covered by the alluvium deposited by the major river system of Cauvery In the basin, 9 plays are known within Basement, Jurassic, Cretaceous and Paleoceneto-Miocene. Petroleum system was modelled in 3D basis adequate datasets. Cauvery basin has a total hydrocarbon in-place of 1,432 MMTOE. This includes discovered inplace of 294 MMTOE and undiscovered risked in-place of 1,138 MMTOE. The discovered in-place is under commercial production. The basin has 79.5% of total inplace, potential to be explored and discovered. Overview of producing fields: Commercial production in Onland sub-basin commenced in 1986. Major producing fields with cumulative production in parenthesis are namely Narimanam (3.5 MMT, 1 BCM), Kanjirangudi (4.5 BCM), Periyapattinam (4BCM), Kuthalam (0.5 MMT, 3.5 BCM), Kamalapuram (2 MMT, 1 BCM), Pundi (1 MMT), CY-ONN-2002/2 (1 MMT).The sub-basin has 26 fields with 241 wells. The maximum flow rates achieved by any field on record in 2023-24 are, Oil 1,400 BOPD and Gas 1 MMSCMD. Commercial production in Shallow water sub-basin commenced in 1997. Major field with cumulative production in parenthesis are namely PY-3 (3 MMT) from which recommencement in expected by Q4 2024-25. The sub-basin has 2 fields with 2 wells. Currently producing field PY-1 field with average condensate of 9 BCPD with 0.02 MMSCMD gas, while PY-3 field produced upto 10,000 BOPD in 1998. Source: DGH Internal and several stratigraphic sequences of Upper Gondwanas have cropped out along the basin margin areas. Mapping of deeper plays, including Basement and facies propagation of Pre-Albian sequences are the focus area of exploration. Good quality source rocks are present within Syn-rift (Jurassic & Early Cretaceous Shale) and Post-rift (Late Cretaceous, Eocene, Oligocene and Miocene shale) sequences with good TOC >1% and Organic matter (OM) is Type II + III. Basement Play alongwith Jurassic and Early Cretaceous plays are prospective. Gulf of Mannar basin remains a focus area in view of recent discoveries in Sri Lankan waters. Hydrocarbon prospectivity and Basin maturity:
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