India's Hydrocarbon Outlook – 2022-2023

48 DGH: 3 DECADES OF UNLOCKING INDIA'S HYDROCARBON POTENTIAL Assam-Arakan Fold Belt (AAFB) is a Category I basin, implying that the basin has significant commercial discovered inplace. The basin has an area of 80,825 sq. km. which is entirely onland. In the basin, 7 plays are present within Eocene to Pliocene. Thebasin is characterizedprimarilyby siliciclastic deposits of fluvial to shelf margin setup, situated in the northeast region of Indian peninsula. It cuts through major states of North-East Region (NER) of India (Assam, Arunachal Pradesh, Nagaland, Manipur, Mizoram and Tripura). The basin is currently under active exploration stage. Commercial hydrocarbon occurrences are mainly encountered within Miocene and Pliocene formation except some small discoveries in Oligocene and Eocene sequences. Several gas pools have been discovered within the structural closure while hydrocarbon accumulations often indicate charging from deeper sequence. Assam Arakan Fold Belt basin is a peri-cratonic, passive margin basin, with Fold Belt and Naga- Schuppen belt. The basin hosts thick pile of Tertiary sediments, ranging from Paleocene to Recent which overlies the Archean basement consisting of granitic and metamorphic rocks. Mio-Pliocene petroleum system is discovered and producing. Deepest Oligocene play (Renji) is yet to be thoroughly explored. All proven system has significant risked resources. Prospectivity The Assam-Arakan Fold Belt (AAFB) basin has a total hydrocarbon inplace of 1,178 MMTOE, out of which 178 MMTOE has been discovered and it includes both commercial and sub-commercial inplace. The remaining, 1,000 MMTOE, nearly 85% 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 6. ASSAM-ARAKAN FOLD BELT (AAFB) BASIN DGH Internal DGH Archive the signature of compressional tectonics during Himalayan Orogeny. The basin includes two distinct tectonic setting, viz. Tripura-Cacchar