Page 23 - DGH_Annual_Report

India's Sedimentary Basins: Subsurface Insights 23

Source: DGH Internal Source: DGH Internal

University of Houston, Texas, U.S.A. is engaged set of 2D and 3D seismic surveys. The study is
under GoI programme in research related expected to provide a regional framework for
studies for Andaman, Mahanadi and Bengal planning future 2D/3D seismic surveys. The NDR
offshore areas. data were used under NDR Data Policy on value-
added study at a cost to company. Subsequently,
GoI has also engaged NOCs, to coordinate with TGS expanded the east coast study to develop
international experts from consulting agencies another proprietary tool, christened as Facies
and IOCs to finalize and drill 4 stratigraphic Map Browser, that will provide extensive access
wells, one each in four frontier offshore basins, to well-based stratigraphic interpretation and
including Andaman, Mahanadi, Saurashtra and sequence-constrained facies maps.
Bengal.
In onland part of Cauvery basin, Airborne Gravity-
M/s TGS, Perth, Australia carried out an integrated Gradiometry (AGG) survey was conducted
seismic study of India's east coast margin using in areas where seismic surveys could not be
proprietary tool, termed as 2D cubed , whereby a 3D undertaken due to operational challenges.
seismic migration volume is generated from a

2.1.1 KRISHNA-GODAVARI (KG) BASIN (38% of total offshore), and is known for country’s
largest deepwater gas field. Both deepwater
Krishna-Godavari (KG) is a Category I basin with and shallow water are extensively appraised with
commercial discovered in-place. large-scale datasets, which is an opportunity
The onland part of the basin overlaps with the for intensive exploration of stratigraphic traps
state(s) of Andhra Pradesh. majorly the channelized deposits.
Krishna-Godavari (KG) is located along the The KG basin consists of sediments with
east coast of Indian peninsula, lying between thickness of more than 7,000m, ranging in age
Mahanadi basin in the north and Cauvery basin from the Early Permian to Recent. The basin’s
towards south. The basin is most prospective onland part is mostly covered by the alluviums
and largely proven with maximum resources deposited by the two major river systems, viz.,