Page 49 - DGH_Annual_Report

India's Sedimentary Basins: Subsurface Insights 49

Pliocene formation except some small discoveries • Overview of producing fields:
in Oligocene and Eocene sequences. Several gas
pools have been discovered within the structural Commercial production in onland area
closure while hydrocarbon accumulations often commenced in 1976. Major producing fields with
indicate charging from deeper sequences. cumulative production in parenthesis are namely
Agartala Dome (9.5 BCM), Konaban(7.7 BCM),
The basin hosts a thick pile of tertiary sediments, Manikyanagar-Rokhia (4.2 BCM), Baramura(2.5
ranging from Paleocene to Recent, which BCM), Sundulbari(1.6 BCM). The area has 11 fields
overlies the Archean basement consisting of with 375 producing wells. The maximum flow
granitic and metamorphic rocks. rates achieved by any field on record are Oil 15
BOPD and Gas 1 MMSCMD.
Mio-Pliocene petroleum system is discovered
and producing. Deepest Oligocene play (Rengi) • Basin datasets and studies:
is yet to be thoroughly explored.
As of 31.03.2025, NDR has archived primary
The fact that structural traps primarily had datasets of 18,287 LKM 2D seismic, 4,637 SKM
formed since Miocene, sequential restoration 3D seismic and 497 conventional wells (362
and migration of thrusts are the focus area. exploratory). Multiple flavours of reprocessed
seismic datasets are also archived whenever the
• Hydrocarbon prospectivity and Basin same are provided by E&P Operators.
maturity:

In the basin, 7 plays are identified within Eocene-
to-Pliocene. Petroleum system was modelled in
3D where datasets were adequate and Aerial
Yield method was used where data were limited.

Assam-Arakan Fold Belt (AAFB) basin has a
total hydrocarbon in-place of 1,176 MMTOE. This
includes discovered in- place of 176 MMTOE and
undiscovered risked in-place of 1,000 MMTOE.
The discovered in-place is under commercial
production. The basin has 85% of total in-place,
potential to be explored and discovered.

Source: DGH Internal

Basin appraisal and regime-wise active acreage:

Location Basin area(skm) Appraised(skm) Active acreage [Nos./Area(skm)]

Onland 80,825 74,359 (92%) Nomination: 37/7,353 Fields: 2/87 NELP:
7/7,104 OALP: 14/6,569 DSF: 3/638

The basin occupies an area of 80,825 sq km. It has been appraised to the extent of 74,359 sq km
(92%). %). The active acreage nos. across regime(s) are 63 with area 21,751 sq. km (27% of basin area).
Bidding opportunities:

Onland: 1 DSF (Round IV) contract area with 645 sq km area [8 discoveries namely Laxmijan-
1A, Bihubar-1, Barsilla-1, Charaideo-1, Tukbai-2, Patharia-2, Patharia-5, Kheram-2]