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The methane hydrate formation and the resource estimate resulting from free gas migration in seeping seafloor hydrate stability zone
Guan, Jinan1,2,3; Liang, Deqing1,3; Wu, Nengyou1,3; Fan, Shuanshi3
2009-10-18
发表期刊JOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
卷号36期号:4-5页码:277-288
通讯作者liangdq@ms.giec.ac.cn
摘要It is a typical multiphase flow process for hydrate formation in seeping seafloor sediments. Free gas can not only be present but also take part in formation of hydrate. The volume fraction of free gas in local pore of hydrate stable zone (HSZ) influences the formation of hydrate in seeping seafloor area, and methane flux determines the abundance and resource of hydrate-bearing reservoirs. In this paper, a multiphase flow model including water (dissolved methane and salt)-free gas hydrate has been established to describe this kind of flow-transfer-reaction process where there exists a large scale of free gas migration and transform in seafloor pore. In the order of three different scenarios, the conversions among permeability, capillary pressure, phase saturations and salinity along with the formation of hydrate have been deducted. Furthermore, the influence of four sorts of free gas saturations and three classes of methane fluxes on hydrate formation and the resource has also been analyzed and compared. Based on the rules drawn from the simulation, and combined information gotten from drills in field, the methane hydrate(MH) formation in Shenhu area of South China Sea has been forecasted. It has been speculated that there may breed a moderate methane flux below this seafloor HSZ. If the flux is about 0.5 kg m(-2) a(-1), then it will go on to evolve about 2700 ka until the hydrate saturation in pore will arrive its peak (about 75%). Approximately 1.47 x 10(9) m(3) MH has been reckoned in this marine basin finally, is about 13 times over preliminary estimate. (c) 2009 Elsevier Ltd. All rights reserved.
文章类型Article
其他摘要It is a typical multiphase flow process for hydrate formation in seeping seafloor sediments. Free gas can not only be present but also take part in formation of hydrate. The volume fraction of free gas in local pore of hydrate stable zone (HSZ) influences the formation of hydrate in seeping seafloor area, and methane flux determines the abundance and resource of hydrate-bearing reservoirs. In this paper, a multiphase flow model including water (dissolved methane and salt)-free gas hydrate has been established to describe this kind of flow-transfer-reaction process where there exists a large scale of free gas migration and transform in seafloor pore. In the order of three different scenarios, the conversions among permeability, capillary pressure, phase saturations and salinity along with the formation of hydrate have been deducted. Furthermore, the influence of four sorts of free gas saturations and three classes of methane fluxes on hydrate formation and the resource has also been analyzed and compared. Based on the rules drawn from the simulation, and combined information gotten from drills in field, the methane hydrate(MH) formation in Shenhu area of South China Sea has been forecasted. It has been speculated that there may breed a moderate methane flux below this seafloor HSZ. If the flux is about 0.5 kg m-2 a-1, then it will go on to evolve about 2700 ka until the hydrate saturation in pore will arrive its peak (about 75%). Approximately 1.47 109 m3 MH has been reckoned in this marine basin finally, is about 13 times over preliminary estimate.
关键词Free Gas Methane Hydrate Volume Fraction Methane Flux Formation
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.jseaes.2009.05.008
研究领域[WOS]Geology
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关键词[WOS]BOTTOM SIMULATING REFLECTORS ; GULF-OF-MEXICO ; MARINE-SEDIMENTS ; FLUID-FLOW ; MARGIN ; MODEL ; RIDGE ; CONSTRAINTS ; CLATHRATE ; TRANSPORT
收录类别SCI
语种英语
项目资助者National Basic Research Program-973 [2009CB219504]; NSFC-Guangdong Union Foundation [NSFC-U0733033]; CAS [MSGL09-10]; ACS [KGCX2-YW-805]; China University of Geosciences, Wuhan, China
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000270622500002
引用统计
被引频次:29[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.giec.ac.cn/handle/344007/3300
专题中国科学院广州能源研究所
作者单位1.CAS, Key Lab Renewable Energy & Gas Hydrate, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
2.CAS, Key Lab Marginal Sea Geol, Guangzhou Inst Geochem, Guangzhou 541640, Guangdong, Peoples R China
3.CAS, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Guangdong, Peoples R China
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Guan, Jinan,Liang, Deqing,Wu, Nengyou,et al. The methane hydrate formation and the resource estimate resulting from free gas migration in seeping seafloor hydrate stability zone[J]. JOURNAL OF ASIAN EARTH SCIENCES,2009,36(4-5):277-288.
APA Guan, Jinan,Liang, Deqing,Wu, Nengyou,&Fan, Shuanshi.(2009).The methane hydrate formation and the resource estimate resulting from free gas migration in seeping seafloor hydrate stability zone.JOURNAL OF ASIAN EARTH SCIENCES,36(4-5),277-288.
MLA Guan, Jinan,et al."The methane hydrate formation and the resource estimate resulting from free gas migration in seeping seafloor hydrate stability zone".JOURNAL OF ASIAN EARTH SCIENCES 36.4-5(2009):277-288.
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