Sentences with phrase «of gas hydrate»

The extra pressure from the glacier could have allowed a regional layer of gas hydrate to form at about 100 meters depth.

Improvements in our understanding of clathrate chemistry and sedimentology have revealed that hydrates form in only a narrow range of depths (continental shelves), at only some locations in the range of depths where they could occur (10 - 30 % of the Gas hydrate stability zone), and typically are found at low concentrations (0.9 — 1.5 % by volume) at sites where they do occur.

Response of Gas Hydrate Reservoirs to Induced Change.

Projects are to utilize existing field data, and / or collect field data (including log, core, and remote sensing data) to evaluate the occurrence, nature, and behavior of gas hydrate geologic systems.

Characterization of Gas Hydrate Deposits.

Tim Collett, USGS senior scientist, said: «The discovery of what we believe to be several of the largest and most concentrated gas hydrate accumulations yet found in the world will yield the geologic and engineering data needed to better understand the geologic controls on the occurrence of gas hydrate in nature and to assess the technologies needed to safely produce gas hydrates.»

Kennedy, M.J., N. Christie - Blick, and L.E. Sohl, 2001: Are Proterozoic cap carbonates and isotopic excursions a record of gas hydrate destabilization following Earth's coldest intervals?

The USGS, which announced the discovery, estimates there is about 700,000 tcf of gas hydrate worldwide, most of it below the ocean floors, where hydrates form under high pressure and cold temperatures.

The project at the University of Texas at Austin will develop conceptual and numerical models to analyze conditions under which gas will be expelled from existing marine accumulations of gas hydrate into the ocean, which could potentially have a damaging effect to the ecosystem.

Knowledge of the timescales of gas hydrate dissociation and subsequent methane release are critical in understanding the impact of marine gas hydrates on the ocean — atmosphere system, says Shyam Chand, researcher at NGU / CAGE.

Hornbach, Matthew J., Saffer, D.M., Holbrook, W. S., Van Avendonk, H.J.A., Gorman, A., «3D seismic imaging of the Blake Ridge methane hydrate province: evidence for large concentrated zones of gas hydrate and morphologically - driven advection,» Journal of Geophysical Research (Solid Earth), 2008.

For example, data from this study has been used to examine the evolution of gas hydrate stability within the Eurasian Arctic over glacial timescales, exploring the development of massive mounds and methane blow - out craters that have been recently discovered on the Arctic seafloor.

A search for gas venting on the Arctic seafloor focused on pingo - like - features (PLFs) on the Beaufort Sea Shelf because they may be a direct consequence of gas hydrate decomposition at depth.

In areas of rapid gas hydrate formation, surrounding pore waters can become very saline, and surpass the point of gas hydrate - free gas equilibrium.

This is largely unrelated to the initial topic, because the described feature likely has nothing to do with dissociation of gas hydrate, for reasons noted by several people.

s the subsurface warms, the top of the gas hydrate stability zone will move downward.

As such, there is a diffusion gradient of dissolved CH4 between the top of gas hydrate and the seafloor.

From the Experimental investigation of gas hydrate and ice formation in methane - saturated sediments E.M. Chuvilin, E.V. Kozlova, N.A. Makhonina (Faculty of Geology, Moscow State University, Russia) and V.S. Yakushev (Gazprom, VNIIGAZ, Russia) in Permafrost Phillips, Springman & Arenson (eds) 2003 Swets & Zeitlinger, Lisse, ISBN 90 5809 582 7

As it melts, one cubic meter of gas hydrate will release 164 cubic meters of natural gas.

For example, data from this study has been used to examine the evolution of gas hydrate stability within the Eurasian Arctic over glacial timescales, exploring the development of massive mounds and methane blow - out craters that have been recently discovered on the Arctic seafloor.

Despite the rising sea level and therefore increasing pressure, the simulation showed that towards the end of the ice age large amounts of gas hydrate became unstable and the released gas escaped through the sediment to the seawater.

Two years ago, in a kind of crater off the Democratic Republic of the Congo, 10,000 feet down, a team led by Myriam Sibuet of the French Research Institute for Ocean Exploitation, discovered a spectacular cold seep with a vast field of clams and mussels, blue shrimp, purple sea cucumbers, and six - foot - long tube worms growing in bushes next to mounds of gas hydrate.

One cubic meter of gas hydrate on the ocean floor contains 165 cubic meters of gas at room temperature and pressure.

They are associated with temporal changes in dissociation of gas hydrates - the icy substance that contains huge amounts of methane.

Gargantuan stores of gas hydrates under the oceans and permafrost regions of the globe have many scientists wondering whether they can find an economically feasible way to unlock the methane, creating a natural gas supply that could last for centuries.

In a computer model, the team used the available data to simulate the evolution of the seabed and the response of the gas hydrates during this period.

For their study, the team had investigated the history of gas hydrates in the Nyegga area.

Boulder, Colo., USA: Cretaceous climate warming led to a significant methane release from the seafloor, indicating potential for similar destabilization of gas hydrates under modern global warming.

Based on pressure and temperature modelling, we show that the last deglaciation could have triggered dissociation of gas hydrates present in the region of the northern part of the Norwegian Channel, causing degassing of 0.26 MtCH4 / km2 at the seafloor.

They are associated with temporal changes in dissociation of gas hydrates — the icy substance that contains huge amounts of methane.

Nor do we adequately understand the relative contributions of microbes (i.e., biogenic methanogenesis), fossil sources, and the dissociation of gas hydrates (an ice - like substance formed by methane and water under pressure).

But such gas hydrates normally occur at depths of at least 100 metres, says Carolyn Ruppel, a geophysicist in charge of the gas hydrates project at the US Geological Survey in Woods Hole, Massachusetts.

The release of gas hydrates may still be stoppable through a suite of techniques including withdrawing atmospheric CO2 by rapidly building soil fertility on a global scale, reforestation to increase reflective cloud cover, and rapidly reducing CO2 emissions — in other words, a massive emergency campaign to cool the planet: Climate Code Red!

The focus will be set on interfacial attributes of gas hydrates, and the next - generation tools used to probe them.

The ESS is a powerful supplier of methane to the atmosphere owing to the continued degradation of the submarine permafrost, which causes the destruction of gas hydrates.

The research to be conducted by Georgia Tech will advance the understanding of the behavior of gas hydrates hosted in fine - grained sediments such as clay or silt, and will evaluate extraction methods relevant to the potential to produce gas from such sediments.

Brewer, P.G., C. Paull, E.T. Peltzer, W. Ussler, G. Rehder, and G. Friederich, Measurements of the fate of gas hydrates during transit through the ocean water column, Geophysical Research Letters, 29 (22), 2002.

Not exact matches

Recent estimates indicate that just 1 percent of Earth's hydrate deposits could yield enough natural gas to meet American needs for 170,000 years at current rates.

Gas hydrates, icelike deposits of methane locked away in permafrost and buried at the ocean bottom, may pose a threat to our climate (see Discover, March 2004).

Gas hydrates naturally form along the coasts of continents and in Arctic permafrost, places where water and gas mix at relatively high pressure and low temperatuGas hydrates naturally form along the coasts of continents and in Arctic permafrost, places where water and gas mix at relatively high pressure and low temperatugas mix at relatively high pressure and low temperature.

Thomsen and his colleagues have discovered that changes in ocean currents triggered by storms raging on the sea surface can alter the release of gas from the hydrate mounds.

Gaining a better understanding of how nanobubbles impact their formation and dissociation could help design procedures to more efficiently and safely harvest hydrates for natural gas capture.

Gas hydrates are expected to make up a significant portion of the energy mix once existing oil fields dwindle, Scott says.

When these hydrates decompose (with the injection of heat or depressurization), the gas inside is liberated and can then be used for energy.

These structures hold a remarkable quantity of gas, according to Amadeu K. Sum, a chemical engineer and director of the Center for Hydrate Research at the Colorado School of Mines.

«If the decomposition of the methane hydrate phase is fast enough, which depends on temperature, the methane gas in the aqueous phase forms nanobubbles,» said Saman Alavi, one of the lead researchers on the project.

Gas hydrates — a mixture of ice and methane — are found only in high - pressure and cold temperatures.

Hydrates are a currently untapped source of natural gas, one of the chief energy sources in the United States.

«The gas hydrate pingos in permafrost are formed because of the low temperatures.

says Peter Franek first author of the study, and researcher at CAGE Centre for Arctic Gas Hydrate, Environment and Climate.