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Geologic implications of gas hydrates in the offshore of India: Krishna-Godavari Basin, Mahanadi Basin, Andaman Sea, Kerala-Konkan Basin

DRS at CSIR-National Institute of Oceanography

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Title Geologic implications of gas hydrates in the offshore of India: Krishna-Godavari Basin, Mahanadi Basin, Andaman Sea, Kerala-Konkan Basin
 
Creator Kumar, P.
Collett, T.S.
Boswell, R.
Cochran, J.R.
Lall, M.
Mazumdar, A.
Ramana, M.V.
Ramprasad, T.
Riedel, M.
Sain, K.
Sathe, A.V.
Vishwanath, K.
Yadav, U.S.
 
Subject gas hydrate
petroleum
continental margin
offshore basin
 
Description Gas hydrate resource assessments that indicate enormous global volumes of gas present within hydrate accumulations have been one of the primary driving forces behind the growing interest in gas hydrates.Gas hydrate volumetric estimates in recent years have focused on documenting the geologic parameters in the `gas hydrate petroleum system` that control the occurrence of gas hydrates in nature. The primary goals of this report are to review our present understanding of the geologic controls on the occurrence of gas hydrate in the offshore of India and to document the application of the petroleum system approach to the study of gas hydrates. National Gas Hydrate Program of India executed the National Gas Hydrate Program Expedition 01 (NGHP-01) in 2006 in four areas located on the eastern and western margins of the Indian Peninsula and in the Andaman Sea. These areas have experienced very different tectonic and depositional histories. The peninsular margins are passive continental margins resulting from a series of rifting episodes during the breakup and dispersion of Gondwanaland to form the present Indian Ocean. The Andaman Sea is bounded on its western side by a convergent margin where the Indian plate lithosphere is being subducted beneath southeast Asia. NGHP-01 drilled, logged, and/or cored 15 sites (31 holes) in the KrishnaeGodavari Basin, 4 sites (5 holes) in the Mahanadi Basin, 1 site (2 holes) in the Andaman Sea, and 1 site (1 hole) in the Kerala eKonkan Basin. Holes were drilled using standard drilling methods for the purpose of logging-whiledrilling and dedicated wireline logging; as well as through the use of a variety of standard coring systems and specialized pressure coring systems. NGHP-01 yielded evidence of gas hydrate from downhole log and core data obtained from all the sites in the KrishnaeGodavari Basin, the Mahanadi Basin, and in the Andaman Sea. The site drilled in the KeralaeKonkan Basin during NGHP-01 did not yield any evidence of gas hydrate. Most of the downhole log-inferred gas hydrate and core-recovered gas hydrate were characterized as either fracture-filling in clay-dominated sediments or as pore-filling or grain-displacement particles disseminated in both fineand coarse-grained sediments. Geochemical analyses of gases obtained from sediment cores recovered during NGHP-01 indicated that the gas in most all of the hydrates in the offshore of India is derived from microbial sources; only one site in the Andaman Sea exhibited limited evidence of a thermogenic gas source. The gas hydrate petroleum system concept has been used to effectively characterize the geologic controls on the occurrence of gas hydrates in the offshore of India
 
Date 2015-01-08T08:51:26Z
2015-01-08T08:51:26Z
2014
 
Type Journal Article
 
Identifier Marine and Petroleum Geology, vol.58; 2014; 29-98
http://drs.nio.org/drs/handle/2264/4676
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2014] Elsevier
 
Publisher Elsevier