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Methane hydrate rock physics models for the Blake Outer Ridge
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TLDR
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.Abstract:
Seismic analyses of methane hydrate data from the Blake Outer Ridge indicate high Pwave velocity and anomalously low S-wave velocity in sediments containing methane hydrates. In an attempt to explain this observed P-wave and S-wave velocity structure at the transition from gas to hydrates, the effect of different hydrate models on elastic moduli and velocities are explored. After construction of an initial gas model, the properties of the hydrates are estimated using the bound averaging method together with the Voigt and Reuss bounds for elastic moduli. The result suggests that the hydrates becomes part of the rock matrix and softens the pores by fracturing. The additional formation of ice is required to obtain the desired P- to S-wave velocity ratio in the hydrate bearing sediments, indicating temperature conditions around the freezing point of water.read more
Citations
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Journal ArticleDOI
Seismic rock physical modelling for gas hydrate-bearing sediments
Xinxin Liu,Xingyao Yin,Xiwu Luan +2 more
TL;DR: In this article, the authors built a rock physical model for load-bearing and pore-filling gas hydrate-bearing sediments, describing the mineral compositions, pore connectivity, and the pore shape using effective media theory, and calculated the shear properties of pore filling gas hydrates using Patchy saturation theory and generalized Gassmann theory.
Blake Outer Ridge dataset
TL;DR: In this article, Biondi et al. presented a map of the Blake Outer Ridge, highlighting the area of known hydrate distribution as mapped from seismic bottom simulating reflectors (BSR).
References
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Journal ArticleDOI
Gas hydrates—geological perspective and global change
TL;DR: In this article, the authors discuss three important aspects of gas hydrates: their potential as a fossil fuel resource, their role as a submarine geohazard, and their effects on global climate change.
Journal ArticleDOI
Velocity structure of a gas hydrate reflector.
TL;DR: 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.
Journal ArticleDOI
Physical properties of sediments containing gas hydrates
Robert D. Stoll,George M. Bryan +1 more
TL;DR: In this article, the authors conducted a program of experimental research to study thermal conductivity and acoustic wave velocity in hydrates and sediments containing hydrate and found that the formation of hydrate tends to cause a decrease in the thermal conductivities of a sediment.
Book
Global warming: The Greenpeace report
TL;DR: In this article, the authors present the science behind the Greenhouse effect, Steven Schneider biogeochemical feedbacks in global warming, David Schimmel modelling stabilization of the greenhouse gas content of the atmosphere, Mick Kelly.
Book ChapterDOI
Gas Hydrates of the Blake Outer Ridge Site 533, Deep Sea Drilling Project Leg 76
K.A. Kvenvolden,L.A. Barnard +1 more
TL;DR: A recent DSDP Leg 11 report indicated the presence of gas hydrates in sediments of the Blake Outer Ridge as mentioned in this paper, and Leg 76 coring and sampling confirms that they are present there.
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