Anomalous seismic reflections related to gas/gas hydrate occurrences along the western continental margin of India

2001 ◽  
Vol 21 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Rao Y. ◽  
Subrahmanyam C. ◽  
Rastogi A. ◽  
Deka B.
Keyword(s):  
Continental Margin ◽  
Gas Hydrate ◽  
Seismic Reflections

Estimation of gas-hydrate concentration and free-gas saturation at the Norwegian-Svalbard continental margin

2005 ◽  
Vol 53 (6) ◽  
pp. 803-810 ◽  
Author(s):  
José M. Carcione ◽  
Davide Gei ◽  
Giuliana Rossi ◽  
Gianni Madrussani
Keyword(s):  
Continental Margin ◽  
Gas Hydrate ◽  
Free Gas ◽  
Gas Saturation

scholarly journals Gas Seeps at the Edge of the Gas Hydrate Stability Zone on Brazil’s Continental Margin

Geosciences ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 193 ◽  
Author(s):  
Marcelo Ketzer ◽  
Daniel Praeg ◽  
Maria A.G. Pivel ◽  
Adolpho H. Augustin ◽  
Luiz F. Rodrigues ◽  
...  
Keyword(s):  
Gravitational Collapse ◽  
Continental Margin ◽  
Gas Hydrate ◽  
Deep Sea ◽  
Rio Grande ◽  
Cold Seep ◽  
Stability Zone ◽  
The Stability ◽  
Sea Fan ◽  
Hydrate Stability

Gas hydrate provinces occur in two sedimentary basins along Brazil’s continental margin: (1) The Rio Grande Cone in the southeast, and (2) the Amazon deep-sea fan in the equatorial region. The occurrence of gas hydrates in these depocenters was first detected geophysically and has recently been proven by seafloor sampling of gas vents, detected as water column acoustic anomalies rising from seafloor depressions (pockmarks) and/or mounds, many associated with seafloor faults formed by the gravitational collapse of both depocenters. The gas vents include typical features of cold seep systems, including shallow sulphate reduction depths (<4 m), authigenic carbonate pavements, and chemosynthetic ecosystems. In both areas, gas sampled in hydrate and in sediments is dominantly formed by biogenic methane. Calculation of the methane hydrate stability zone for water temperatures in the two areas shows that gas vents occur along its feather edge (water depths between 510 and 760 m in the Rio Grande Cone and between 500 and 670 m in the Amazon deep-sea fan), but also in deeper waters within the stability zone. Gas venting along the feather edge of the stability zone could reflect gas hydrate dissociation and release to the oceans, as inferred on other continental margins, or upward fluid flow through the stability zone facilitated by tectonic structures recording the gravitational collapse of both depocenters. The potential quantity of venting gas on the Brazilian margin under different scenarios of natural or anthropogenic change requires further investigation. The studied areas provide natural laboratories where these critical processes can be analyzed and quantified.

Gas hydrate and mud volcanoes on the southwest African continental margin off South Africa

Geology ◽  
2002 ◽  
Vol 30 (10) ◽  
pp. 927 ◽  
Author(s):  
Zvi Ben-Avraham ◽  
George Smith ◽  
Moshe Reshef ◽  
Eric Jungslager
Keyword(s):  
South Africa ◽  
Continental Margin ◽  
Gas Hydrate ◽  
Mud Volcanoes

Probable gas hydrate/free gas model over western continental margin of India

2002 ◽  
Vol 23 (5/6) ◽  
pp. 423-430 ◽  
Author(s):  
N. Satyavani ◽  
Uma Shankar ◽  
N.K. Thakur ◽  
S.I. Reddi
Keyword(s):  
Continental Margin ◽  
Gas Hydrate ◽  
Free Gas

Gas-hydrate stability thickness map along the Indian continental margin

2011 ◽  
Vol 28 (10) ◽  
pp. 1779-1786 ◽  
Author(s):  
Kalachand Sain ◽  
V. Rajesh ◽  
N. Satyavani ◽  
K.V. Subbarao ◽  
C. Subrahmanyam
Keyword(s):  
Continental Margin ◽  
Gas Hydrate ◽  
Hydrate Stability

Geological controls on the Storegga gas-hydrate system of the mid-Norwegian continental margin

2003 ◽  
Vol 209 (3-4) ◽  
pp. 291-307 ◽  
Author(s):  
Stefan Bünz ◽  
Jürgen Mienert ◽  
Christian Berndt
Keyword(s):  
Continental Margin ◽  
Gas Hydrate
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