India's Hydrocarbon Outlook – 2022-2023

85 DGH: 3 DECADES OF UNLOCKING INDIA'S HYDROCARBON POTENTIAL Deccan Syneclise is a Category III basin and it has an area of 237,500 sq. km. which is entirely onland. In the basin, 2 plays exist within Precambrian and Late Paleozoic (Gondwana). Deccan Syneclise basin is located in the western and south-central part of India. The basin is sparsely explored with limited geoscientific data and the elements of petroleum system in the basin are speculative. The basin is bounded to the north by the inferred southern limit of Narmada Basin, to the south by exposures of Precambrian sediments and the east by the outcrops of Archaean metamorphic rocks. Towards west, the coast line is considered as the basin limit. Based on gravity and DSS data about 1.5-2.0 Km thick sediments are speculated to be present underneath Deccan Trap basalt The inferred geological history of this area favours presence of Pre-Trappean Gondwana and Proterozoic sequences in the area. The Cooper Basin of Australia and India's Vindhyan Basin are suitable analogues for Pre-Trappean Gondwana Play and Proterozoic Play respectively. 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. Prospectivity The Deccan Syneclise basin has a total hydrocarbon inplace of 12 MMTOE, which is entirely undiscovered and potential for intense exploration. The basin has been assessed for the first time. During 2017 Hydrocarbon Resource Assessment Study, Aerial Yield method has been used on analogy of Vindhyan Basin (Pre-Cambrian) and Cooper Basin, Australia (Gondwana). 1,500m sedimentary thickness is envisaged in the basin. Geological map (semi-detailed), DSS along 2 profiles, GM data (6,000 stations), MT data (5 profiles) and geochemical survey (analysis of adsorbed gas on 1,006 samples) are used in the study. Seismic data in form of Deep Seismic Sounding profiles is available. Gravitydata is of goodquality while Magnetic data and report are fair and Geochemical data are poor. The data reliability is good. Cooper Basin of Australia and Vindhyan Basin has been used as analogue. Inadequate geoscientific data leads to adopt areal yield 22. DECCAN SYNECLISE BASIN DGH Internal DGH Archive