Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| 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 | |
| Source Publication | JOURNAL OF ASIAN EARTH SCIENCES
 |
| ISSN | 1367-9120 |
| Volume | 36Issue:4-5Pages:277-288 |
| Corresponding Author | liangdq@ms.giec.ac.cn |
| Abstract | 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. |
| Subtype | Article |
| Other Abstract | 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. |
| Keyword | Free Gas Methane Hydrate Volume Fraction Methane Flux Formation |
| WOS Headings | Science & Technology ; Physical Sciences |
| DOI | 10.1016/j.jseaes.2009.05.008 |
| WOS Subject Extended | Geology |
| URL | 查看原文 |
| WOS Keyword | BOTTOM SIMULATING REFLECTORS ; GULF-OF-MEXICO ; MARINE-SEDIMENTS ; FLUID-FLOW ; MARGIN ; MODEL ; RIDGE ; CONSTRAINTS ; CLATHRATE ; TRANSPORT |
| Indexed By | SCI |
| Language | 英语 |
| Funding Organization | 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 Subject | Geosciences, Multidisciplinary |
| WOS ID | WOS:000270622500002 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/3300 |
| Collection | 中国科学院广州能源研究所 |
| Affiliation | 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 |
| Recommended Citation GB/T 7714 | 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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