Natural Gas Hydrates-Geol ogical Perespective

LEI Huai-yan; WANG Xian-bin; ZHENG Yan-hong; ZHANG Zhong-ning; ZHOU Xiao-feng

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Article Navigation > Acta Sedimentologica Sinica > 1999 > 17(S1): 846-853

LEI Huai-yan, WANG Xian-bin, ZHENG Yan-hong, ZHANG Zhong-ning, ZHOU Xiao-feng. Natural Gas Hydrates-Geol ogical Perespective[J]. Acta Sedimentologica Sinica, 1999, 17(S1): 846-853.

Citation:

LEI Huai-yan, WANG Xian-bin, ZHENG Yan-hong, ZHANG Zhong-ning, ZHOU Xiao-feng. Natural Gas Hydrates-Geol ogical Perespective[J]. Acta Sedimentologica Sinica, 1999, 17(S1): 846-853.

Natural Gas Hydrates-Geol ogical Perespective

State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000

Received Date: 1999-04-06
Publish Date: 1999-12-10

Abstract

Natural gas hydrates have become an exciting national and international research issue. Gas hydrates,also called gas clathrates,naturally occur in solids comprised of water molecules forming a rigid lattice of cages with most of the cages, each containing a molecule of natural gas,mainly methane. Natural gas hydrates exists worldwide in the polar region,normally associated with onshore and offshore permafrost,and in sediment of outer continental and insular margins. The role that methane hydrates will play in contributing to the world's energy needs will depend on the availability,producibility,and cost of extracting methane from the hydrate phase. The generally accepted estimates of the total amount of methane that in gas hydrates is about twice the total methane of all fossil fuels (i. e. gas,oil,coal, etc.)combined.However, if even a small portion of the suspected gas hydrate accumulation is producible, hydrates would have a significant impact as an energy resource. The total amount of methane in gas hydrates likely exceeds 1019g methane carbon. Three important research areas clearly emerge as common themes in all gas hydrate research plans:(l)hydrates as an energy resource, (2) hydrates as agent of global change,and (3) hydrates as a factor in seafloor stability and geohazards. Because natural gas hydrates represent a large amount of methane within 2000m of the earth's surface, they are considered to be an unconventional,unproven source of fossil fuel.Because gas hydrates are metastable,changes of pressure and temperature affect their stability. Destabilized gas hydrates beneath the seafloor lead to geologic hazards such as submarine slumps and slides,examples of those are found worldwide. Destabilized gas hydrates may also affect climate through the release of methane,a "greenhouse" gas,which may enhance global warming and be an important factor in global climate change. I thought that in each of these aspects an imposing need arises for study that is both technically demanding and of public interest. Here we briefly review those three themes and their underlying scientific opportunitres.
- natural gas hydrate,
- fuel energy,
- properties,
- geological prospective

References

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Natural Gas Hydrates-Geol ogical Perespective

State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000

Received Date: 1999-04-06

Publish Date: 1999-12-10

Key words:

Abstract: Natural gas hydrates have become an exciting national and international research issue. Gas hydrates,also called gas clathrates,naturally occur in solids comprised of water molecules forming a rigid lattice of cages with most of the cages, each containing a molecule of natural gas,mainly methane. Natural gas hydrates exists worldwide in the polar region,normally associated with onshore and offshore permafrost,and in sediment of outer continental and insular margins. The role that methane hydrates will play in contributing to the world's energy needs will depend on the availability,producibility,and cost of extracting methane from the hydrate phase. The generally accepted estimates of the total amount of methane that in gas hydrates is about twice the total methane of all fossil fuels (i. e. gas,oil,coal, etc.)combined.However, if even a small portion of the suspected gas hydrate accumulation is producible, hydrates would have a significant impact as an energy resource. The total amount of methane in gas hydrates likely exceeds 1019g methane carbon. Three important research areas clearly emerge as common themes in all gas hydrate research plans:(l)hydrates as an energy resource, (2) hydrates as agent of global change,and (3) hydrates as a factor in seafloor stability and geohazards. Because natural gas hydrates represent a large amount of methane within 2000m of the earth's surface, they are considered to be an unconventional,unproven source of fossil fuel.Because gas hydrates are metastable,changes of pressure and temperature affect their stability. Destabilized gas hydrates beneath the seafloor lead to geologic hazards such as submarine slumps and slides,examples of those are found worldwide. Destabilized gas hydrates may also affect climate through the release of methane,a "greenhouse" gas,which may enhance global warming and be an important factor in global climate change. I thought that in each of these aspects an imposing need arises for study that is both technically demanding and of public interest. Here we briefly review those three themes and their underlying scientific opportunitres.

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Natural Gas Hydrates-Geol ogical Perespective

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