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Multidisciplinary investigations exploring indicators of gas hydrate occurrence in the Krishna–Godavari Basin offshore, east coast of India

DRS at CSIR-National Institute of Oceanography

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Title Multidisciplinary investigations exploring indicators of gas hydrate occurrence in the Krishna–Godavari Basin offshore, east coast of India
 
Creator Ramana, M.V.
Ramprasad, T.
Paropkari, A.L.
Borole, D.V.
Rao, B.R.
Karisiddaiah, S.M.
Desa, M.
Kocherla, M.
Joao, H.M.
LokaBharathi, P.A.
DeSouza, M.J.B.D.
Pattan, J.N.
Khadge, N.H.
PrakashBabu, C.
Sathe, A.V.
Kumar, P.
Sethi, A.K.
 
Subject gas hydrates
underwater exploration
oil and gas exploration
seismic data
seismic reflection
methane
 
Description Some main results of multidisciplinary investigations carried out within the framework of the Indian National Gas Hydrate Program in 2002–2003 in the Krishna–Godavari Basin offshore sector, east coast of India are reported, to explore indicators of likely gas hydrate occurrence suggested by preliminary multi-channel seismic reflection data and estimates of gas hydrate stability zone thickness. Swath bathymetry data reveal new evidence of three distinct geomorphic units representing (1) a delta front incised by several narrow valleys and mass flows, (2) a deep fan in the east and (3) a WNW–ESE-trending sedimentary ridge in the south. Deep-tow digital side-scan sonar, multi-frequency chirp sonar, and sub-bottom profiler records indicate several surface and subsurface gas-escape features with a highly resolved stratification within the upper 50 m sedimentary strata. Multi-channel seismic reflection data show the presence of bottom simulating reflections of continuous to discrete character. Textural analyses of 76 gravity cores indicate that the sediments are mostly silty clay. Geochemical analyses reveal decreasing downcore pore water sulphate (SO sub(4) sup(2-)) concentrations (28.7 to
 
Date 2009-06-05T09:48:19Z
2009-06-05T09:48:19Z
2009
 
Type Journal Article
 
Identifier Geo-marine letters, vol.29(1); 25-38
http://drs.nio.org/drs/handle/2264/3359
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D pupose and Copyright [2009] Springer.
All efforts have been made to respect the copyright to the best of our
knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Springer