oleocene.org

GillesH38 a écrit :le danger est bien moins grand que ce qu'il parait , pour le moment : les émissions de méthane des hautes latitudes par dégazage des hydrates sont bien moins élevées que celles des zones chaudes (fermentation anaérobies, rizières, etc...), et de toutes façons le méthane est encore un composant minoritaire de l'effet de serre. Il ne peut y avoir effet d'emballement que si le dégazage commençait à etre une composante significative du forçage total, mais on en est encore très loin : doubler quelque chose qui ne fait que 1% du total, ça ne fait que rajouter 1% sur ce total, comme dirait M. de Lapalisse....

Alturiak a écrit :Oui, et il dirait aussi que doubler 20% ça rajoute 20%.

Japan, U.S. sign pact on methane hydrate

Saturday 07th June

AOMORI —
Japan and the United States agreed Saturday to accelerate their efforts to research and develop methane hydrate, seen as a promising new next-generation energy source generally trapped beneath the ocean floor.

The two governments will mainly focus on exchanging scientific information and carry out field testing of the output capability of Alaskan North Slope hydrate reservoirs, the officials said.

The National Methane Hydrates R&D Program
DOE/NETL Methane Hydrate Projects

BOEMRE releases report on deepwater gulf gas hydrate finding methods

OGJ Washington Editor Jul 5, 2011

Multicomponent seismic data could be more useful than traditional seismic methods in locating natural gas hydrates in deepwater environments, a study funded by the US Bureau of Ocean Energy Management, Regulation, and Enforcement concluded. The study by Louisiana State University’s Coastal Studies Institute suggested that new technologies using four-component, ocean bottom cable to acquire multicomponent seismic data have shown promise in locating such gas hydrate deposits, BOEMRE said on July 5.

The study also offered an unparalleled research opportunity to employ the new data set collected from a large area of the northern Gulf of Mexico’s upper continental slope to provide a new enhanced imaging capability for the area, the US Department of the Interior agency added.

BOEMRE Director Michael R. Bromwich said the study is critical in finding the most effective way to reach northern gulf gas hydrate deposits for future energy production. “Finding the best and most effective way to gather essential data on these deposits will improve our ability to conduct better resource evaluations of methane hydrates,” he observed.

Aug 31, 2011
...........
Methane hydrates or "fire ice" is methane gas locked in icy deposits at low temperature and high pressure under the ocean floor.

New Zealand has some of the most abundant deposits in the world off the east coast of the North Island and off the south coast of Fiordland.

Commercially viable extraction of a fraction of those deposits - likely to involve melting them by injecting water and chemicals into wells - could provide the country with more than enough gas for decades.

The Government appears serious about exploring the resource and two years ago asked Aberdeen University of Petroleum Engineering Consultants to consider the economics of methane hydrate extraction in a report on this country's petroleum exploration laws and regulations.
............

Echanger du CO2 contre du méthane dans les hydrates...une technologie du futur.

leblogenergie 26 Oct 2011

La créativité des activités humaines n'est pas en panne et le retour à l'état sauvage n'est peut-être pas pour demain. Il est des innovations qui ouvrent de formidables horizons. Les nouveaux modes d'exploitation des gaz de schistes vient en quelques années de rendre caduques bien des prévisions alarmistes annonçant la fin des haricots et du gaz naturel. Mais la vraie révolution viendra peut-être, dans les prochains siècles, de la mise en exploitation des immenses gisements d'hydrates de méthane.



C'est en tous les cas le pari que fait le pétrolier Conoco-Phillips qui, avec l'aide du DOE et du JOGMEC (japonais), prévoit au cours du premier trimestre 2012 de réaliser dans les North Slope de l'Alaska un essai consistant à injecter du CO2 dans les gisements de grès contenant des hydrates de méthane dans le but d'échanger le méthane par du CO2 (FIG.). Ce procédé a été imaginé depuis 2003 par une équipe de l'Université de Bergen en Norvège.

Une autre option qui sera également testée consistera à dépressuriser la zone explorée pour en extraire le gaz.

mahiahi a écrit :Vu aux infos : on aurait découvert un riche gisement d'hydrates de méthane au Mexique ; de quoi remplacer Cantarell?

Sri Lanka seen having gas hydrates in ocean

Dec 06, 2011 (LBO)

A top Indian scientist has said he believes Sri Lanka has huge gas hydrate resources in the ocean around the island as in India.

The ice like solids found in deep water on the ocean floor could generate methane gas, a potential energy source, Harsh Gupta told a forum of Sri Lankan scientists.
The former Secretary of India's ocean development department said Sri Lanka's exclusive economic zone should have gas hydrates as India has found by drilling in her own waters.

"I strongly believe Sri Lanka has huge gas hydrate resources in the EEZ," said Gupta, who is also former director of India's National Geophysical Research Institute.

"Gas hydrates could become a potential source of energy."

The potential zones where the condensed methane hydrates are found in India continue into Sri Lankan waters, Gupta told the annual sessions of the Sri Lanka Association for the Advancement of Science.

This year's sessions are devoted to understanding, harnessing, and conserving the ocean around Sri Lanka and Gupta said he hopes the island would focus more on the science of the oceans around her.

Answer to key concerns is natural gas: ConocoPhillips
.....
Beyond that, there are massive methane hydrate resources under the ocean floor and in the Arctic.
“This is gas trapped in a matrix that resembles ice and while hydrates have never been produced commercially, they could potentially add more centuries of supply,” Mulva said.
“Even without them, shale gas and other unconventional resources are transforming the energy market, leading us to conclude that natural gas can certainly ease today’s energy security concerns and hydrates may one day contribute as well,” he argued.
.......