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Permafrost creation in Kuparuk oil field Alaska and its effects on gas hydrate formation

Permafrost creation in Kuparuk oil field Alaska and its effe...

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Asian Conference on Permafrost

作者： Lynn Aleshire hannele zubeck University of Alaska Anchorage U.S.A.

Use of methane hydrates or gas hydrates may play a significant role as a part of the world’s energy *** effort has been spent in research into how the gas hydrates are formed and where they are *** paper investigates gas hydrate accumulation in a permafrost area of the Prudhoe Bay-Kuparuk River oil field in Alaska,USA by approaching the gas hydrate formation using a thermal analysis and the methane hydrate stability *** thermal regime for the duration of the formation of permafrost in the area was modeled using a finite element method,TEMP/W *** thermal properties were estimated using information from well bore data and logs including deposit characteristics such as rock type and water *** heat of fusion was considered using an unfrozen water content *** values for the past average ground surface temperature was used for several analysis *** value that yielded conditions reflecting current thermal gradient and depth of permafrost was used in the final *** modeled thermal regime as a function of depth and time was then compared with the appropriate methane hydrate phase boundary *** a result,depth zones for stable methane hydrates were obtained with ***,the formed layer of methane hydrates,and the penetration of the 0℃ isotherm and their trapping effects on the free flow of water and gas to the stable zone were considered to explain the logged layers of methane hydrates in the Kuparuk Oil *** created model can be used as an example to create similar models in other locations to be used in methane hydrate exploration and field evaluation.

关键词： Permafrost formation Alaska-North Slope paleoclimate methane hydrates

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