Page 47 - DGH_Annual_Report

India's Sedimentary Basins: Subsurface Insights 47

2.3.1 ASSAM SHELF BASIN

Assam Shelf is a Category I basin with commercial discovered in-place.
The basin overlaps with the state(s) of Arunachal Pradesh, Assam, Meghalaya, Nagaland.

Source: DGH Internal

place of 2,700 MMTOE. This includes discovered
in-place of 1,826 MMTOE and undiscovered
risked in-place of 874 MMTOE.

The discovered in-place is under commercial
production. The basin has 32.4% of total in-place,
potential to be explored and discovered.

2.3.3 Overview of producing fields:
Source: DGH Internal
Commercial production in onland area
commenced in 1889. Major producing fields
The Assam Shelf Basin is situated in the north- with cumulative production in parenthesis are
east region of India. namely Khoraghat (1.4 MMT, 734 BCM), Borholla
(2.8 MMT, 391 BCM), , Greater Naharkatiya (56
Commercial hydrocarbon occurrences are MMT, 33 BCM), Lakwa-Lakhmani-Kuargaon (40.5
spread over different stratigraphic intervals MMT, 6.8 BCM), Greater Hapjan (25.5 MMT, 8.2
ranging from the oldest sediments of Paleocene BCM), Moran (19.2 MMT, 6.6 BCM). The area has 47
(Tura) to the youngest sediments of Pliocene fields with 1,593 producing wells. The maximum
(Girujan), apart from fractured plays of Basement. flow rates achieved by any field on record are Oil
Mature source rocks lie below the Naga thrust 20,863 BOPD and Gas 3 MMSCMD.
belt, which is pivotal to future exploration focus. 2.3.4 Basin datasets and studies:
Shallow play near Naga-Schuppen belt remains
focus area of exploration. As of 31.03.2025, NDR has archived primary
datasets of 34,926 LKM 2D seismic, 12,470 SKM
2.3.2 Hydrocarbon prospectivity and Basin 3D seismic and 3,494 conventional wells (1,228
maturity: exploratory). Multiple flavour of reprocessed
In the basin, 8 plays are identified within seismic datasets are also archived whenever the
same are provided by E&P Operators.
Basement and Tertiary. Petroleum system was
modelled in 3D basis adequate datasets. The basin has 17 coal-seam gas wells (2
exploratory).
Assam Shelf basin has a total hydrocarbon in-