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
Citations
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Journal ArticleDOI
A single-channel seismic reflection method for quantifying lateral variations in BSR reflectivity
TL;DR: In this article, a single-channel, short-offset data was used to investigate the distribution of propagation speeds in the vicinity of sink-simulating reflectors (BSRs).
Journal ArticleDOI
The Response of Gas Hydrates to Tectonic Uplift
TL;DR: In this paper , the authors used TOUGH+HYDRATE to investigate the response of gas hydrates to an uplift of 0.009 myr over the last 8 kyrs, the approximate end of the postglacial sea-level rise.
Journal ArticleDOI
The Margin-Oblique Kumawa Strike-Slip Fault in the Banda Forearc, East Indonesia: Structural Deformation, Tectonic Origin and Geohazard Implication
Book ChapterDOI
Identification to Quantification of Gas Hydrates
TL;DR: In this paper, the authors present details of different interpretation techniques and seismic characteristics for drawing inference about the presence of gas hydrates in a region of investigations, which can be achieved by travel time inversion schemes.
Journal ArticleDOI
Well-Logging Constraints on Gas Hydrate Saturation in Unconsolidated Fine-Grained Reservoirs in the Northern South China Sea
Xiao Qin Wan,Xue Gang Zhou,Jinqiang Liang,Shiguo Wu,Jing'an Lu,Chenglong Wei,Ruisheng Wang,Bo Liu +7 more
TL;DR: Wang et al. as discussed by the authors used four wells in GMGS3 and GMGS4 to evaluate the effects of three typical methods for evaluating saturation with different principles in the unconsolidated fine-grained sediments: nuclear magnetic logging, sigma logging, and the Archie formula.
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).