Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors | |
Guan, Jinan1,2,3,4 ; Wan, Lihua1,2,3,4; Liang, Deqing1,2,3,4
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| 2019-09-01 | |
| Source Publication | MARINE AND PETROLEUM GEOLOGY
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| ISSN | 0264-8172 |
| Volume | 107Pages:185-197 |
| Corresponding Author | Liang, Deqing(liangdq@ms.giec.ac.cn) |
| Abstract | As massive methane hydrate reservoirs in Shenhu slope area of northern South China, the structural-seepage hydrate-bearing sediments, which mainly include thick-bedded and disseminated types of hydrates, show favorable advantages of high content, great thickness, and excellent exploitation value. They are generated by thermogenic methane vertically migrated from deep strata through faults, and finally accumulate in shallow sand layers. In order to investigate the formation dynamics of massive methane hydrate reservoirs in Shenhu area, a vertical fluid flow-methane hydrate formation reaction-seafloor sedimentation model is designed to gauge the accumulation mechanism. From the analysis of Peclet number which weighs the relative importance between deposition and formation reaction, local methane hydrate looks more likely to actively gather together in the sediments primarily, then gradually evolve into massive reservoirs accompanying passive seafloor sedimentation. Through choosing three typical formation stages (50 ka, 3 Ma, and 5 Ma) to exhibit the evolution process of these hydrate reservoirs, the change of local pressures, temperatures, dissolved methane and salt, phase saturations, stratum permeability, and pore capillary pressure deduces how the structural-seepage hydrate reservoir operates. The investigation also shows that after 5 Ma theses hydrate-bearing layers can proceed to take on similar appearance with current occurrence when average seafloor sedimentation rate and the initial seafloor are 5 cm/ka and 988 m, respectively. Finally, the performance of five controlling factors, including methane flux, kinetic coefficient, initial fluid position, permeability and seafloor sedimentation rate, has been quantitatively assessed in this formation model. Our work verifies this methane hydrate formation reaction-seafloor sedimentation mechanism is adequate for studying Shenhu structural-seepage hydrate reservoirs. The findings further suggest the combination of small methane flux and small reaction coefficient should be preferentially recommended to breed this type of methane hydrate-bearing layers. |
| Keyword | Shenhu area Methane hydrate Structural-seepage type Formation dynamics Seafloor sedimentation |
| DOI | 10.1016/j.marpetgeo.2019.05.024 |
| WOS Keyword | RIVER MOUTH BASIN ; GAS HYDRATE ; CONTINENTAL-SLOPE ; BEARING SEDIMENTS ; MARINE-SEDIMENTS ; ACCUMULATION ; SATURATION ; SIMULATION ; EVOLUTION ; MIGRATION |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[41344149] ; National Natural Science Foundation of China[51576197] ; Science and Technology Program of Guangzhou, China[201707010252] ; Chinese National Marine Research Program[GHZ2012006003] |
| WOS Research Area | Geology |
| Funding Organization | National Natural Science Foundation of China ; Science and Technology Program of Guangzhou, China ; Chinese National Marine Research Program |
| WOS Subject | Geosciences, Multidisciplinary |
| WOS ID | WOS:000484871100013 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/25692 |
| Collection | 中国科学院广州能源研究所 |
| Corresponding Author | Liang, Deqing |
| Affiliation | 1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Key Lab Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China 3.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Guangdong, Peoples R China 4.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Guangdong, Peoples R China |
| First Author Affilication | GuangZhou Institute of Energy Conversion,Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Guan, Jinan,Wan, Lihua,Liang, Deqing. Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors[J]. MARINE AND PETROLEUM GEOLOGY,2019,107:185-197. |
| APA | Guan, Jinan,Wan, Lihua,&Liang, Deqing.(2019).Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors.MARINE AND PETROLEUM GEOLOGY,107,185-197. |
| MLA | Guan, Jinan,et al."Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors".MARINE AND PETROLEUM GEOLOGY 107(2019):185-197. |
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