Page 33 - DGH_Annual_Report

India's Sedimentary Basins: Subsurface Insights 33

• Hydrocarbon prospectivity and Basin The basin has been identified for drilling of one
maturity: stratigraphic well under the GoI-approved plan.
University of Western Australia, Perth had carried
In the basin, 8 plays exist within Gondwana- out the stratigraphic and geomorphic analysis
Cretaceous-Tertiary in the Onland part. 5 plays of deepwater deposits and the basin is currently
are known within Eocene- Pliocene in Offshore being studied by University of Houston, Texas,
part. 3 plays are identified within Gondwana USA.
(Karharbari-Barakar-Raniganj) of Purnea sub-
basin. Petroleum system was modelled in 3D
basis adequate datasets.

Onland area has a total hydrocarbon in-place
of 307 MMTOE and this is largely undiscovered
risked in-place. Offshore area has a total
hydrocarbon in-place of 220 MMTOE and this
is entirely undiscovered risked in-place. Purnea
sub-basin has a total hydrocarbon in-place of 15
MMTOE and this is entirely undiscovered risked
in-place.

• Overview of producing fields:
Commercial production in Bengal area
commenced in 2020. The oil production started
from Asokenagar discovery subsequent to
implementation of early development scheme
in the block WB-ONN-2005/4 (Asokenagar-1).
Basin datasets and studies:
As of 31.03.2025, NDR has archived primary
datasets of 66,453 LKM 2D seismic, 30,380
SKM 3D seismic and 111 conventional wells (103
exploratory). Multiple flavours of reprocessed
seismic datasets are also archived whenever the
same are provided by E&P Operators.
The basin has 4 coal-seam gas wells (all Source: DGH Internal
exploratory).

Basin appraisal and regime-wise active acreage:

Location Basin area (skm) Appraised (skm) Active acreage [Nos./Area(skm)]
Purnea 4,901 3,929 (80%) CBM: 1/991
Bengal 37,513 34,427 (92%) NELP: 1/2,365 OALP: 3/8,510
Shallow water 33,465 27,441 (82%) NELP: 1/833 OALP: 1/5,755 DSF: 1/541
Deepwater 46,035 46,035 (100%) No active acreage
The basin occupies an area of 121,914 sq km. It has been appraised to the extent of 111,832 sq km (92%).
The active acreage nos. across regime(s) are 8 with area 18,995 sq. km (16% of basin area)

Bidding opportunities:

Shallow water: 1 OALP (Round X) block with 9,827 sq km area Deepwater: 1 OALP (Round X) block
with 12,316 sq km area

Shallow water: 1 OALP (Round X) block with 9,827 sq km area
Deepwater: 1 OALP (Round X) block with 12,316 sq km area