Trapping and migration of methane associated with the gas hydrate stability zone at the Blake Ridge Diapir: new insights from seismic data

Taylor, Michael H.; Dillon, William P.; Pecher, Ingo

doi:10.1016/s0025-3227(99)00128-0

Cited by 162 publications

(139 citation statements)

References 15 publications

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“…Seismic studies at Blake Ridge have observed the presence of bubbles along faults in the sediment matrix (Taylor et al, 2000). Faults have been correlated with sites of methane gas emission from the sea floor (Aoki et al, 2000;Zuhlsdorff et al, 2000;Zuhlsdorff and Spiess, 2004).…”

Section: Gas Migrationmentioning

confidence: 99%

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Methane hydrate stability and anthropogenic climate change

2007

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Abstract. Methane frozen into hydrate makes up a large reservoir of potentially volatile carbon below the sea floor and associated with permafrost soils. This reservoir intuitively seems precarious, because hydrate ice floats in water, and melts at Earth surface conditions. The hydrate reservoir is so large that if 10% of the methane were released to the atmosphere within a few years, it would have an impact on the Earth's radiation budget equivalent to a factor of 10 increase in atmospheric CO 2 .Hydrates are releasing methane to the atmosphere today in response to anthropogenic warming, for example along the Arctic coastline of Siberia. However most of the hydrates are located at depths in soils and ocean sediments where anthropogenic warming and any possible methane release will take place over time scales of millennia. Individual catastrophic releases like landslides and pockmark explosions are too small to reach a sizable fraction of the hydrates. The carbon isotopic excursion at the end of the Paleocene has been interpreted as the release of thousands of Gton C, possibly from hydrates, but the time scale of the release appears to have been thousands of years, chronic rather than catastrophic.The potential climate impact in the coming century from hydrate methane release is speculative but could be comparable to climate feedbacks from the terrestrial biosphere and from peat, significant but not catastrophic. On geologic timescales, it is conceivable that hydrates could release as much carbon to the atmosphere/ocean system as we do by fossil fuel combustion.

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Section: Gas Migrationmentioning

confidence: 99%

“…The thickness of the stability zone (heavy solid lines) increases with ocean depth. (Taylor et al, 2000;Wood et al, 2002).…”

Section: Gas Migrationmentioning

confidence: 99%

Methane hydrate stability and anthropogenic climate change

2007

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“…Seismic attributes like instantaneous frequency, instantaneous phase, blanking, and reflection strength have been used to identify gas hydrate from seismic data [30][31][32]. The Variance Cube operation was used to highlight faults and subtle stratigraphic features in a 3D seismic volume.…”

Section: Seismic Attributesmentioning

confidence: 99%

Geophysical Indicators of Gas Hydrate in the Northern Continental Margin, South China Sea

Wang

Guo

et al. 2011

Journal of Geological Research

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Gas hydrate drilling results show that gas hydrate has a close relationship with strong bottom-simulating reflectors (BSRs) identified from seismic data in the Baiyun sag, South China Sea. The BSRs observed on seismic profiles at the crests of submarine canyons indicate the likely existence of gas hydrate. We calculate the acoustic impedance using constrained sparse spike inversion (CSSI), the interval velocity, and the seismic reflection characteristics such as reflection strength, instantaneous frequency, blanking, and enhanced reflection to demonstrate the presence of gas hydrate. Higher acoustic impedance and P-wave velocity were identified above the BSR. A remarkable low impedance, low frequency, and acoustic blanking indicated the presence of gas below gas hydrate stability zone. The occurrence of gas hydrate at the crests of canyons suggests that the abundance of gas hydrate in Baiyun sag may be due to the migrating submarine canyons providing the structural reliefs and the topographic ridges.

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“…Finite 419 element modelling of the gas chimneys through hydrate stability field in the Cascadia margin 420 off the Coast of Vanancouver Island, suggests that in areas of fluid and heat flux methane gas 421 can exist well inside the regional hydrate stability zone due to local temperature anomaly near 422 the site of focused fluid flow (Wood et al, 2002). Alternatively, the gas hydrate in the 423 surrounding sediments may seal the fault walls such that the water supply is too low to 424 transform all the gas into gas hydrate (Taylor et al, 2000). However, the apparent absence of 425 the BSR could also be related to signal penetration problems not associated with the carbonate 426 fig.…”

Section: Temperature At the Bsr Depth 302mentioning

confidence: 99%

High-resolution, deep tow, multichannel seismic and sidescan sonar survey of the submarine mounds and associated BSR off Nicaragua pacific margin

et al. 2007

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Please cite this article as: Talukder, A.R., Bialas, J., Klaeschen, D., Buerk, D., Brueckmann, W., Reston, T., Breitzke, M., High-resolution, deep tow, multichannel seismic and sidescan sonar survey of the submarine mounds and associated BSR off Nicaragua pacific margin, Marine Geology (2007Geology ( ), doi: 10.1016Geology ( /j.margeo.2007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T show that the BSR in many cases continues but rises beneath the mounds. This is consistent 79 with the advection of deep warm fluids and thus increased heat flow through the mounds. The 80 occurrence of mud mounds seems to be controlled by the locations of faults. 81

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Trapping and migration of methane associated with the gas hydrate stability zone at the Blake Ridge Diapir: new insights from seismic data

Cited by 162 publications

References 15 publications

Methane hydrate stability and anthropogenic climate change

Methane hydrate stability and anthropogenic climate change

Geophysical Indicators of Gas Hydrate in the Northern Continental Margin, South China Sea

High-resolution, deep tow, multichannel seismic and sidescan sonar survey of the submarine mounds and associated BSR off Nicaragua pacific margin

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