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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Dissertation
3D seismic analysis of subsurface gas migration and the gas hydrate system offshore Mauritania
TL;DR: In this article, the authors used 3D seismic data to investigate fluid migration processes and the gas hydrate system offshore Mauritania, which is composed of alternating high and low amplitudes and characterized by amplitude bands on the BSR map.
Journal ArticleDOI
Identification of pore-filling gas hydrate deposits in marine sediments based on amplitude-versus-angle study
TL;DR: In this paper, the amplitude-versus-angle (AVA) patterns of reflection interfaces overlying by different pore-filling minerals were analyzed to identify gas hydrate from marine sediments.
Methane hydrate rock physics models for the Blake Outer Ridge
TL;DR: In this article, the effect of different hydrate models on elastic moduli and velocities of hydrate-bearing sediments was explored. But the results of the experiments were limited to the Blake Outer Ridge.
Dissertation
Seismic studies of gas hydrate in the Ulleung Basin, East Sea, offshore Korea
TL;DR: In this paper, a 2D multi-channel seismic reflection profile from the Ulleung Basin was used to estimate gas hydrate and free gas distribution and saturation in local structures in the East Sea offshore Korea.
Journal ArticleDOI
Tomographic approach for gas hydrate investigation in Kerala-Konkan region, India
TL;DR: In this article, a 2D approach was used to estimate the probable velocity field configuration from multichannel seismic data and infer the presence of gas hydrates/free-gas in the offshore Kerala-Konkan region, along the eastern part of a seismic line on which a bottom simulating reflector (BSR) has previously been identified.
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).