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

Kumar, Pushpendra; Collett, Timothy S.; Boswell, Ray; Cochran, James R.; Lall, M.V.; Mazumdar, Aninda; Ramana, M.V.; Ramprasad, T.; Riedel, Michael; Sain, Kalachand; Sathe, A. V.; Vishwanath, Krishna; Yadav, U.S.

doi:10.1016/j.marpetgeo.2014.07.031

Cited by 101 publications

(32 citation statements)

References 27 publications

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“…3. India East Coast (passive continental margin) i. India National Gas Hydrate Program Expedition 1, NGHP-01 [Collett et al, 2014;Kumar et al, 2014, and references therein] and ii. IODP Expedition 353, Sites U1445 and U1446 [Clemens et al, 2016].…”

Section: Introductionmentioning

confidence: 99%

Observed correlation between the depth to base and top of gas hydrate occurrence from review of global drilling data

Riedel

Collett

2017

Geochem Geophys Geosyst

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A global inventory of data from gas hydrate drilling expeditions is used to develop relationships between the base of structure I gas hydrate stability, top of gas hydrate occurrence, sulfate‐methane transition depth, pressure (water depth), and geothermal gradients. The motivation of this study is to provide first‐order estimates of the top of gas hydrate occurrence and associated thickness of the gas hydrate occurrence zone for climate‐change scenarios, global carbon budget analyses, or gas hydrate resource assessments. Results from publically available drilling campaigns (21 expeditions and 52 drill sites) off Cascadia, Blake Ridge, India, Korea, South China Sea, Japan, Chile, Peru, Costa Rica, Gulf of Mexico, and Borneo reveal a first‐order linear relationship between the depth to the top and base of gas hydrate occurrence. The reason for these nearly linear relationships is believed to be the strong pressure and temperature dependence of methane solubility in the absence of large difference in thermal gradients between the various sites assessed. In addition, a statistically robust relationship was defined between the thickness of the gas hydrate occurrence zone and the base of gas hydrate stability (in meters below seafloor). The relationship developed is able to predict the depth of the top of gas hydrate occurrence zone using observed depths of the base of gas hydrate stability within less than 50 m at most locations examined in this study. No clear correlation of the depth to the top and base of gas hydrate occurrences with geothermal gradient and sulfate‐methane transition depth was identified.

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Section: Introductionmentioning

confidence: 99%

Observed correlation between the depth to base and top of gas hydrate occurrence from review of global drilling data

Riedel

Collett

2017

Geochem Geophys Geosyst

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“…The total of 39 holes were drilled at 21 sites in 4 areas in Indian Offshore (1 site in Kerela-Konkan, 15 sites in Krishna-Godavari, 4 sites in Mahanadi and 1 site in Andaman) [21]. Presence of gas hydrates in the K-G and Mahanadi offshore basins and the Andaman regions have been confirmed.…”

Section: Sites Of Nghp Expedition 01 2006 Operational Programmementioning

confidence: 83%

Field Testing of Gas Hydrates - An Alternative to Conventional Fuels

Arora¹,

Cameotra²,

Balomajumder³

2015

J Pet Environ Biotechnol

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“…It is one of the key geological units of the Andaman subduction zone as knowledge about the depositional systems in the forearc has the potential to elaborate a series of past tectonic events, directly associated with the subduction processes. Moreover, the Andaman Forearc has strong significance in terms of hydrocarbon potential proven by previous gas hydrate studies (Kumar et al 2014). The marine gas hydrates developed in this area are found to be at greater depths compared to those in other parts of the world, and their presence is confirmed by recent drilling activity of NGHP (National Gas Hydrate Program of India) Expedition-01 (Kumar et al 2014).…”

Section: Introductionmentioning

confidence: 82%

“…Moreover, the Andaman Forearc has strong significance in terms of hydrocarbon potential proven by previous gas hydrate studies (Kumar et al 2014). The marine gas hydrates developed in this area are found to be at greater depths compared to those in other parts of the world, and their presence is confirmed by recent drilling activity of NGHP (National Gas Hydrate Program of India) Expedition-01 (Kumar et al 2014). The history of longterm sedimentation processes in the past also holds the key for understanding monsoon variability in South Asia.…”

Section: Introductionmentioning

confidence: 93%

“…Although the source for this thrust generation is not clearly known, based on similar observations in the Sunda Forearc region Harbury and Kallagher 1991;Lüschen et al 2011), we infer that it could have originated from imbricate thrust sheets consisting of a mélange of sediments/rocks from the off-scraped sediments from the downgoing plate. Another important observation from our interpretation is identification of bottom simulating reflectors (BSRs), a proxy indicator for gas hydrate formation (Sain and Gupta 2012;Kumar et al 2014). We have also imaged BSRs based on their special properties on the seismic sections such as (1) mimicking the seabed with reverse polarity; (2) crosscutting the layers; and (3) overlying acoustic blanking zones.…”

Section: The Andaman Forearc Basin and Its Basementmentioning

confidence: 99%

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Late Cenozoic seismic stratigraphy of the Andaman Forearc Basin, Indian Ocean

et al. 2017

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Interpretation of new multichannel seismic reflection data from the Andaman Forearc Basin (AFB) in the northern Indian Ocean is presented here. The highquality multichannel seismic data from the Andaman Forearc region enable us to examine the seismic characters and to demarcate seismic sequences bounded by distinct unconformities. Ages of marked seismic horizons have been calibrated with available litholog data from nearby industry boreholes. Seismic interpretation of new data shows that the AFB is filled with * 4.5-s-two way travel time (TWT) thick Neogene to Recent sediments. The entire basin assemblage exhibits two distinct major sequences pertaining to the Neogene and Quaternary times. A large part of the basin is filled with intermittent mass transport deposits (MTD). We infer that the episodic uplift of the Invisible Bank, protuberance of the outerarc and regular deformation through reactivation of preexisting normal faults since the Pleistocene could be attributed as causal mechanisms for the MTDs. Strong bottom simulating reflectors are identified in the Late Miocene and younger sediments of the outerarc and AFB at a depth of * 0.6 s TWT and correspond to the presence of gas hydrates in this region. Our interpretations have significant implications for geodynamic as well as resource exploration in the AFB.

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

Cited by 101 publications

References 27 publications

Observed correlation between the depth to base and top of gas hydrate occurrence from review of global drilling data

Observed correlation between the depth to base and top of gas hydrate occurrence from review of global drilling data

Field Testing of Gas Hydrates - An Alternative to Conventional Fuels

Late Cenozoic seismic stratigraphy of the Andaman Forearc Basin, Indian Ocean

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