Journal ArticleDOI
Velocity structure of a gas hydrate reflector.
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TLDR
Waveform inversion of seismic reflection data can be used to estimate from seismic data worldwide the velocity structure of a BSR and its thickness, and predicts that sediment pores beneath the BSR contain free methane for approximately 30 meters.Abstract:
Seismic reflection profiles across many continental margins have imaged bottom-simulating reflectors (BSRs) parallel to the seabed; these are often interpreted as the base of a zone in which methane hydrate "ice" is stable. Waveform inversion of seismic reflection data can be used to estimate from seismic data worldwide the velocity structure of a BSR and its thickness. A test of this method at a drill site of the Ocean Drilling Program predicts that sediment pores beneath the BSR contain free methane for approximately 30 meters. The hydrate and underlying gas represent a large global reservoir of methane, which may have economic importance and may influence global climate.read more
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Journal Article
Specific character of the bottom simulating reflectors near mud diapirs : Western margin of India
Uma Shankar,Kalachand Sain +1 more
TL;DR: In this article, the authors present the results of seismic surveys which indicate the existence of natural gas hydrates in the western margin of India and apply them to select areas for coring (or drilling) and detailed exploration.
Journal ArticleDOI
Ocean bottom seismometer data modeling to infer gas hydrate saturation in Krishna-Godavari (KG) basin
TL;DR: In this paper, the authors used the velocities derived from seismic refraction data/well log/multi-channel seismic (MCS) data as the starting point for the saturation estimation of gas hydrates/free gas.
Book ChapterDOI
6. The Road Ahead
John R. Waggoner,Ian Jack,Jim Keggin,Mark Benson,Walter Rietveld,Ted Manning,Peter Cook,Chris Page,Jianchun Dai,Haibin Xu,Fred Snyder,Nader Dutta,Christine Ecker,Jack Dvorkin,Amos M. Nur,Bob A. Hardage,A. T. McInally,T. Redondo-López,J. Garnham,J. Kunka,A. D. Brooks,L. Stenstrup Hansen,F. Barclay,D. Davies,J. R. Waggoner,A. Cominelli,R. H. Seymour,A. Stradiotti,Greg Walker,Peter Allan,Robert Trythall,Ronnie Parr,Marcus Marsh,Roar Kjelstadli,Olav Barkved,Daniel Johnson,Scott Lane,Rob Arts,Ola Eiken,Andy Chadwick,Peter Zweigel,Bert Van Der Meer,Gary Kirby,A. Bakulin,A. Mateeva,K. Mehta,P. Jorgensen,J. Ferrandis,I. Sinha Herhold,J. Lopez,Olav Inge Barkved,Jan H. Kommedal +51 more
Journal ArticleDOI
Buried gas hydrates in the deepwater of the south caspian sea, azerbaijan: implications for geo-hazards
TL;DR: In this paper, two multi-channel seismic reflection profiles in the deepwater of the South Caspian Sea, offshore Azerbaijan, document one of the first examples of buried gas hydrates.
Journal ArticleDOI
Seismic attribute enhancement of weak and discontinuous gas hydrate bottom-simulating reflectors in the Pegasus Basin, New Zealand
TL;DR: Gas hydrates in the oceanic subsurface are often difficult to image with reflection seismic data, particularly when the strata run parallel to the seafloor and in regions that lack the pres...
References
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Journal ArticleDOI
Methane hydrate — A major reservoir of carbon in the shallow geosphere?
TL;DR: The estimated amount of organic carbon in the methane-hydrate reservoir greatly exceeds that in many other reservoirs of the global carbon cycle as discussed by the authors, such as the atmosphere (3.6 Gt), terrestrial biota (830 Gt); terrestrial soil, detritus and peat (1960 Gt).
Journal ArticleDOI
Seismic waves in a stratified half space.
Brian Kennett,N. J. Kerry +1 more
TL;DR: In this paper, the response of a stratified elastic half space to a general source may be represented in terms of the reflection and transmission properties of the regions above and below the source.
Journal ArticleDOI
A mechanism for the formation of methane hydrate and seafloor bottom‐simulating reflectors by vertical fluid expulsion
Roy D. Hyndman,Earl E. Davis +1 more
TL;DR: In this paper, the authors present a model in which bottom-simulating reflectors (BSR) hydrate layers are formed through the removal of methane from upward moving pore fluids as they pass into the hydrate stability field.
Journal ArticleDOI
A seismic study of methane hydrate marine bottom simulating reflectors
Roy D. Hyndman,George D. Spence +1 more
TL;DR: In this article, multichannel seismic reflection data have been analyzed from an area of clear bottom simulating reflectors (BSRs) on the northern Cascadia subduction zone margin off Vancouver Island.
Journal ArticleDOI
Sound velocity–density relations in sea‐floor sediments and rocks
TL;DR: In this article, the authors present empirical sound velocity-density relations (in the form of regression curves and equations) in terrigenous silt clays, turbidites, and shale, in calcareous materials (sediments, chalk, and limestone).