India’s Hydrocarbon Outlook 2024 52 A Report on Exploration & Production Activities 7. ANDAMAN BASIN Andaman is a Category II basin, implying that the basin has sub-commercial discovered inplace, potential to be commercially produced. Andaman is an offshore basin, characterized primarily by siliciclastic shallow to deepwater sediments. Fore-arc has a significant gas discovery in Miocene, analogous to producing reservoirs of Myanmar and Indonesia gas fields. Gas hydrate has also been established in Fore-arc. Back-arc area has sediments with prominent entrapment features on seismic. Hydrocarbon occurrences are reported in Mid Miocene Play, geographically present in East Andaman part. Potential future gas discoveries are considered mainly within structural entrapment conditions. The hydrocarbon accumulations often indicate charging from deeper source sequence. The basin is envisaged to host sediments, ranging from Paleocene to Recent. Geochemical data and structural complexity are key areas of focus. Southeastern area of East Andaman is considered prospective due to source rock maturity. Basin area is under revision to 248,908 sq km, subject to a detail review during the next hydrocarbon resource assessment study. A string of gas and condensate discoveries in the syn-rift Oligocene clastic sequences in North Sumatra and Irrawaddy-Margui basin like Timpan-1, Tangkulo-1 and Layaran-1, suggests that in addition to post-rift thermogenic and biogenic plays in east Andaman basin, syn-rift thermogenic petroleum system is functional but are yet to be delineated. Thick deepwater shales are the main source and seal, reefal carbonates also act as minor source to shallow marine syn-rift and post-rift sands and limestones with secondary porosity. Source: DGH Internal Source: DGH Internal
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