AccScience Publishing / JSE / Online First / DOI: 10.36922/JSE026180080
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ARTICLE

Three-dimensional evaluation of gas hydrate utilizing 3D seismic and NGHP-01 well log data in the Krishna–Godavari Offshore Basin, India

Nomita Horo1 ,  Maheswar Ojha1,2* ,  Ranjana Ghosh1,2 ,  Amrita Singh1 ,  Uma Shankar3
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1 Department of Gas Hydrate, CSIR-National Geophysical Research Institute, Hyderabad, Telangana, India
2 Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
3 Department of Geophysics, Institute of Science, Banaras Hindu University, Varanasi, Uttar Pradesh, India
JSE, 026180080 https://doi.org/10.36922/JSE026180080
Received: 30 April 2026 | Revised: 2 July 2026 | Accepted: 6 July 2026 | Published online: 27 July 2026
© 2026 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

One of the world’s largest gas hydrate deposits was found at the NGHP-01-10 site in the Krishna–Godavari Offshore Basin, India; however, its lateral extension has not yet been established. We assess a high-gas-hydrate region using three-dimensional (3D) seismic data and NGHP-01 well-log data. A model-based inversion technique was used to obtain 3D acoustic impedance, and a crossplot analysis of elevated acoustic impedance versus gas hydrate saturation was used to estimate gas hydrate saturation. The estimated maximum gas hydrate saturation was approximately 65% for an isotropic medium and 35% for an anisotropic medium. It was believed that a high concentration of gas hydrate was deposited only around the NGHP‑01‑10 site; however, our results showed a larger area of high gas hydrate concentration near the NGHP‑01‑11 site. Our 3D assessment showed that massive gas hydrate recovered during the NGHP-01 expedition at site 01-10 was distributed in a small patch within highly porous, unconsolidated sediments with about 70% porosity. We also estimated the 3D distribution of porosity using seismic and well-log data, which indicated that the entire gas hydrate stability zone was highly porous, with porosity ranging from 45% to 70%. The results of the 3D distribution of gas hydrate and porosity around the NGHP-01 wells in the Krishna–Godavari Offshore Basin could be very important information for possible future production tests in the area.  

Keywords
NGHP-01
Gas hydrate
Krishna–Godavari Offshore Basin
3D saturation
3D porosity
Funding
This research was supported by the Ministry of Earth Sciences (MoES), New Delhi (grant number: MoES/OSMART/EFC2021-OM No. 01(01)/PFC-I/2022).
Conflict of interest
The authors declare that they have no competing interests.
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Journal of Seismic Exploration, Electronic ISSN: 0963-0651 Print ISSN: 0963-0651, Published by AccScience Publishing
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