India’s Hydrocarbon Outlook 2024 90 A Report on Exploration & Production Activities 13. DECCAN SYNECLISE BASIN Deccan Syneclise is a Category III basin, implying that the basin has entirely undiscovered inplace, that calls for intense exploration for a potential discovery. The geographical area of the basin partially overlaps with the state(s) of Dadra and Nagar Haveli, Goa, Gujarat, Karnataka, Maharashtra and Telangana. Source: DGH Internal Source: DGH Internal Deccan Syneclise basin is located in the western and south-central part of India. The large part of the basin is underlain by Deccan basalts. The elements of petroleum system in the basin are speculative. Based on gravity and DSS data about 1.5-2.0 Km thick sediments are speculated to be present underneath Deccan Trap basalts. The basin has the close analogy with Cooper Basin of Australia and Vindhyan Basin. The inferred geological history of this area favours presence of Pre-Trappean Gondwana and Proterozoic sequences in the area. The basin has been divided into three assessment units on the basis of tectonics. Two units in north-east being proximal to Satpura Basin may represent Pre-Trappean Gondwana sequence whereas the third unit represents the Proterozoic sequence. Sub-basalt imaging to study sub-trappean sediments is the focus area. Two petroleum systems are speculated, and the envisaged elements of petroleum system is suggestive of dark gray shales and marls of Lower Gondwana rocks containing abundant organic matter as the source rock. Additionally, the Meso-to-Neo-Proterozoic and Late Cretaceous shale and carbonate may act as source rocks with Lower Gondwana / Mesoproterozoic arenaceous, and carbonate rocks may act as reservoir. The intra-formational shales and the Trap flows may provide extensive seal across the basin.
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