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Many areas of the western Barents Sea host shallow as well as deep-seated hydrocarbon accumulations from which fluids are migrating to the sea floor. Evidence of past episodes of gas migration can be seen in the form of pockmarks on the sea floor as well as vertical pipes or chimneys on seismic sections.

American Association of Petroleum Geologists (AAPG)
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An overview of gas hydrates in deep marine and permafrost settings including their chemical and physical properties, and their formation.
American Association of Petroleum Geologists (AAPG)
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There are a surprising number of AAPG Members (new and experienced) who are not familiar with the technical divisions of AAPG and what they do. Given how much excellent work is done in the divisions, everyone is encouraged to learn more about them.

American Association of Petroleum Geologists (AAPG)
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American Association of Petroleum Geologists (AAPG)
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Methane clathrate (CH4·5.75H2O) or (4CH4·23H2O), also called methane hydrate, hydromethane, methane ice, fire ice, natural gas hydrate, or gas hydrate, is a solid clathrate compound (more specifically, a clathrate hydrate) in which a large amount of methane is trapped within a crystal structure of water, forming a solid similar to ice. Originally thought to occur only in the outer regions of the Solar System, where temperatures are low and water ice is common, significant deposits of methane clathrate have been found under sediments on the ocean floors of the Earth.
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American Association of Petroleum Geologists (AAPG)
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11 February 2010

Gas hydrates, ice-like substances composed of water and gas molecules (methane, ethane, propane, etc.), occur in permafrost areas and in deep water marine environments.

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Natural gas hydrates are naturally occurring combinations of water and natural gas (mainly methane) that form under conditions of high pressure and low temperature. They are known to be widespread in permafrost regions and in deepwater sediments of outer continental margins. It is generally accepted that the amount of natural gas contained in the world's hydrate accumulations greatly exceeds the volume of known conventional gas reserves, and can be commercially produced by adapting existing conventional oil and gas production technology. 

The global resource potential of gas hydrate is in the range of many thousands of trillion cubic feet (Tcf). By comparison, the current annual global demand for natural gas is approximately 117 Tcf. While the current natural gas glut has slowed industry interest in North America, other nations are pressing forward. The 2013 production test in Japan demonstrated the technical feasibility of hydrate production, and commercial production is planned there for 2017. India, South Korea, and China are in close pursuit. The U.S. hydrate program received renewed focus in 2014.

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