Dynamic processes observed at a gas hydrate outcropping on the continental slope of the Gulf of Mexico

Vardaro, Michael; MacDonald, Ian R.; Bender, Leslie; Guinasso, Norman L.

doi:10.1007/s00367-005-0010-2

Cited by 28 publications

(15 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the experimental rate of dissolution for these synthetic samples appeared to be too rapid compared with some in situ observations of hydrate mounds. For example, little visual change was observed over a 350-day period for a hydrate mound at Bush Hill, Gulf of Mexico (Vardaro et al, 2006). Similar hydrate mounds in the Bush Hill area showed significant changes over a 10-month period .…”

Section: Introductionmentioning

confidence: 85%

A natural hydrate dissolution experiment on complex multi-component hydrates on the sea floor

Hester

Peltzer

Walz

et al. 2009

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 85%

A natural hydrate dissolution experiment on complex multi-component hydrates on the sea floor

Hester

Peltzer

Walz

et al. 2009

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

“…Long-term monitoring data are rare, but year-long records from Bush Hill, a high-volume seep in Green Canyon 185 in w550 m deep water, show no significant changes in the size or appearance of the gas hydrate mound. Thermal variations during the observation were dominated only by tides (Vardaro et al, 2005). However, episodes of fluid and/or methane expulsion may be highly variable in time and space (Roberts and Carney, 1997), making extrapolation to other sites, or even other times at the same site, difficult.…”

Section: Areamentioning

confidence: 99%

Gas and gas hydrate distribution around seafloor seeps in Mississippi Canyon, Northern Gulf of Mexico, using multi-resolution seismic imagery

Wood

Hart

Hutchinson

et al. 2008

Marine and Petroleum Geology

View full text Add to dashboard Cite

a b s t r a c tTo determine the impact of seeps and focused flow on the occurrence of shallow gas hydrates, several seafloor mounds in the Atwater Valley lease area of the Gulf of Mexico were surveyed with a wide range of seismic frequencies. Seismic data were acquired with a deep-towed, Helmholz resonator source (220-820 Hz); a high-resolution, Generator-Injector air-gun (30-300 Hz); and an industrial air-gun array (10-130 Hz). Each showed a significantly different response in this weakly reflective, highly faulted area. Seismic modeling and observations of reversed-polarity reflections and small scale diffractions are consistent with a model of methane transport dominated regionally by diffusion but punctuated by intense upward advection responsible for the bathymetric mounds, as well as likely advection along pervasive filamentous fractures away from the mounds.Published by Elsevier Ltd.

show abstract

“…In recent years, much attention has been paid to the long-term in-situ and on-line observations of the methane flux and the spatio-temporal variability at various hydrocarbon seep locations, e.g., Bush Hill of Mexico, Coal Oil Point seep field of the Santa Barbara channel, Hydrate Ridge, the Black Sea and Hikurangi Margin of New Zealand (Roberts et al 1999;Brown 2001, 2004;Boles et al 2001;Torres et al 2002;Tryon et al 2002;Leifer and Boles 2005a, b;MacDonald et al 2005;Vardaro et al 2006;Solomon et al 2008;Sahling et al 2009;Krabbenhoeft et al 2010;Leifer et al 2010;Linke et al 2010;Römer et al 2012a, b;Etiope et al 2013). The preliminary results indicate that the flux and material associated with hydrocarbon seeps are both spatial and temporal in nature Tryon and Brown 2004;Leifer and Boles 2005b;Solomon et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Temporal Variation in Natural Gas Seep Rate and Influence Factors in the Lingtou Promontory Seep Field of the Northern South China Sea

Di¹,

Dong²,

Chen

2014

Terr. Atmos. Ocean. Sci.

View full text Add to dashboard Cite

Natural hydrocarbon seeps in marine environment are important sources of methane and other greenhouse gases into the ocean and the atmosphere. This greenhouse gas seepage influences the global methane budget and global climate change. Hydrocarbon seeps on the shallow seabed produce a near-shore gas bubble zone along the western coast of Hainan Island, in the northern South China Sea. However, few studies on the quantitative value of the methane flux and on temporal variation and influence factors of hydrocarbon seeps have been conducted until now. This study describes the results of continuous gas vent measurements for 420 hours on the seabed of the Lingtou promontory shore. The amount of gas released from a single gas vent was 30.5 m 3 during the measurement period. The gas flow rate ranged from 22 -72 L h -1 , with an average rate of 53.4 L h -1 . The time series analyses of the 420-hour record clearly show three principal tidal components with periods of 5.4, 4.6, and 2.4 hours, which are the main factors controlling the gas flow rate. Low flow rates were associated with high tide and high flow rates associated with low tide. A 1-m increase in seawater height results in a decrease of 20 -30 L h -1 or 35 -56% of the hourly flow rate. Therefore, the changes in gas volume escape from the pore could be attributed to the hydrostatic pressure effect induced by water depth. This dominant mechanism controlled pore activation as well as the gas flow rate, suggesting that in the marine environment, especially the shallow-water shelf area, sea level changes may result in great variations in methane release into the ocean and atmosphere.

show abstract

Dynamic processes observed at a gas hydrate outcropping on the continental slope of the Gulf of Mexico

Cited by 28 publications

References 31 publications

A natural hydrate dissolution experiment on complex multi-component hydrates on the sea floor

A natural hydrate dissolution experiment on complex multi-component hydrates on the sea floor

Gas and gas hydrate distribution around seafloor seeps in Mississippi Canyon, Northern Gulf of Mexico, using multi-resolution seismic imagery

Temporal Variation in Natural Gas Seep Rate and Influence Factors in the Lingtou Promontory Seep Field of the Northern South China Sea

Contact Info

Product

Resources

About