| Abstract Submission No. | ABS-2.4-0179 |
| Title of Abstract | Shallow Structures and Gas Hydrate¿Bearing Zones in the Krishna-Godavari offshore using Seismic Reflection Data |
| Authors | Satendra Singh*, Kalachand Sain, Prakash Kumar |
| Organisation | CSIR-NGRI |
| Address | CSIR-NGRI, Uppal Road, Habsiguda, Hyderabad Hyderabad, Telangana, India Pincode: 500007 E-mail: satendra.ngri@gmail.com |
| Country | India |
| Presentation | Poster |
| Abstract | The Krishna-Godavari (KG) offshore basin, located along the eastern continental margin of India, stands as one of the country¿s most productive and petroliferous regions. Formed through continental rifting and seafloor spreading between the Indian, Antarctic, and Australian plates, the basin spans nearly 45,000 sq. km across onshore and offshore domains. Continuous sediment influx from the Krishna and Godavari rivers has created exceptional stratigraphic conditions for the accumulation of hydrocarbons and formation of gas-hydrates in this basin. This study investigates the subsurface architecture and gas-hydrate¿bearing zones in the KG offshore basin using high-resolution multi-channel seismic (MCS) reflection data, acquired by CSIR-NGRI, Hyderabad. The seismic sections were conditioned with dip-steered median filtering (DSMF) to suppress noise and enhance reflector continuity, thereby enabling accurate geological interpretations. The analysis highlights prominent structural and stratigraphic features, including submarine canyons, horst¿graben systems, channel fills, and seaward-dipping reflectors. A distinct Bottom Simulating Reflector (BSR), the most reliable geophysical marker for gas hydrates, was successfully identified across several sections along the seismic profiles. Beyond hydrate indicators, numerous tectonic and depositional elements such as faults, folds, gullies, chaotic reflections, mini-fill basins, blanking zones, gas chimneys, and mass transport deposits (MTDs) were delineated, revealing the basin¿s structural complexity and dynamic depositional history. To strengthen the interpretation, seismic observations were integrated with the bathymetric, gravity, and magnetic anomaly datasets, establishing correlations between the surface anomalies and deep-seated structures. The findings provide a refined tectono-stratigraphic framework, reinforce the hydrocarbon and gas-hydrate potential of the KG offshore basin, and underscore its significance as a frontier domain for India¿s future energy security. |
| Keywords | Seismic data, Dip Steered Median Filter, Interpretation, Gas-hydrate, BSR, Subsurface structures. |