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Spatio-temporal evolution of stratigraphic-diffusive methane hydrate reservoirs since the Pliocene along Shenhu continental slope, northern South China sea
Guan, Jinan1,2,3,4; Cong, Xiaorong1,2,3,4; Archer, David E.5; Wan, Lihua1,2,3,4; Liang, Deqing1,2,3,4
2021-03-01
发表期刊MARINE AND PETROLEUM GEOLOGY
ISSN0264-8172
卷号125页码:20
通讯作者Guan, Jinan(guanja@ms.giec.ac.cn) ; Liang, Deqing(liangdq@ms.giec.ac.cn)
摘要When biogenic methane produced in marine shallow sediments flows laterally into hydrate stable zones, there is likely to be formation of disperse stratigraphic-diffusive hydrate reservoirs that generally appear thin-bedded and disseminated. The stratigraphic-diffusive layers are also potential industrial exploitation targets because they have moderate abundance, wide distribution, and convenient mining maneuverability. After success of the second trial production in Shenhu area of South China Sea, it is urgent for us to find out the evolution dynamics of the stratigraphic-diffusive hydrate system which is widespread along oceanic continental slopes. Here, the Pearl River Mouth Basin in the northern slope area of South China Sea as a typical passive margin was selected to probe the principles of the accumulation mechanism and distribution pattern of stratigraphic-diffusive methane hydrates, determine the optimal degree of aggregation and spatial extension, and thus evaluate the potential recovery value. Based on the composite stratigraphic sequence, we theoretically described the occurrence characteristics of this type of stratigraphic-diffusive hydrate reservoirs. A two-dimensional model that coupled sedimentation process, fluid flow and reaction kinetics was designed to gauge the influence of engineering geological conditions and other controlling factors since the Pliocene (5.3 Ma) in this system. Several key parameters (including porosity, temperature, salt, and hydrate content) at three different moments, 5 Ma ago, 1.5 Ma ago and at present, were exhibited. The impacts of geothermal gradient and kinetic reaction coefficient on the evolution process were also discussed. Finally, the methane generated from local particulate organic carbons and different start time was used to verify the rationality of this theoretical approach. Our two-dimensional model clearly depicted the occurrence and accumulation characteristics of local stratigraphic-diffusive hydrates, disclosed the exploration value and exhibited the exploitation possibility.
关键词Methane hydrate Stratigraphic-diffusive layer Passive continental slope Shenhu area Spatio-temporal evolution Two-dimensional model
DOI10.1016/j.marpetgeo.2020.104864
关键词[WOS]GAS-HYDRATE ; 2-DIMENSIONAL MODEL ; UNSATURATED FLOW ; QILIAN MOUNTAIN ; STABILITY ZONE ; AREA ; MARGIN ; MIGRATION ; TRANSPORT ; SEDIMENTATION
收录类别SCI
语种英语
资助项目Natural Science Foundation of Guangdong Province, China[2020A1515011120] ; Science and Technology Planning Project of Guangzhou City, China[201707010252] ; Guangdong Province MED Project, China[GDME-2018D001] ; National Natural Science Foundation of China[41374149]
WOS研究方向Geology
项目资助者Natural Science Foundation of Guangdong Province, China ; Science and Technology Planning Project of Guangzhou City, China ; Guangdong Province MED Project, China ; National Natural Science Foundation of China
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000613257700001
出版者ELSEVIER SCI LTD
引用统计
被引频次:6[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/344007/32681
专题中国科学院广州能源研究所
通讯作者Guan, Jinan; Liang, Deqing
作者单位1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China
2.Chinese Acad Sci, Key Lab Gas Hydrate, Guangzhou 510640, Peoples R China
3.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou 510640, Peoples R China
4.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Peoples R China
5.Univ Chicago, Dept Geophys, Chicago, IL 60637 USA
第一作者单位中国科学院广州能源研究所
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Guan, Jinan,Cong, Xiaorong,Archer, David E.,et al. Spatio-temporal evolution of stratigraphic-diffusive methane hydrate reservoirs since the Pliocene along Shenhu continental slope, northern South China sea[J]. MARINE AND PETROLEUM GEOLOGY,2021,125:20.
APA Guan, Jinan,Cong, Xiaorong,Archer, David E.,Wan, Lihua,&Liang, Deqing.(2021).Spatio-temporal evolution of stratigraphic-diffusive methane hydrate reservoirs since the Pliocene along Shenhu continental slope, northern South China sea.MARINE AND PETROLEUM GEOLOGY,125,20.
MLA Guan, Jinan,et al."Spatio-temporal evolution of stratigraphic-diffusive methane hydrate reservoirs since the Pliocene along Shenhu continental slope, northern South China sea".MARINE AND PETROLEUM GEOLOGY 125(2021):20.
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