Influence of seafloor topography on gas hydrate occurrence across a submarine canyon-incised continental slope in the northern margin of the south china sea | |
Wang, Jiliang1,5; Wu, Shiguo1,5; Sun, Jin5; Feng, Wanli2,5; Li, Qingping3,4 | |
刊名 | MARINE AND PETROLEUM GEOLOGY |
2021-11-01 | |
卷号 | 133页码:19 |
关键词 | Gas hydrate stability zone Geothermal gradient Bottom simulating reflection Topographic effect South China Sea |
ISSN号 | 0264-8172 |
DOI | 10.1016/j.marpetgeo.2021.105279 |
英文摘要 | In a submarine canyon-incised continental slope, the observed bottom simulation reflection (BSR) frequently appears not to match with the predicted base of the gas hydrate stability zone (BGHSZ). However, the mechanism behind this discrepancy is often debated due to the lack of in-situ borehole measurements. In the Shenhu area, a submarine canyon region on the northern continental slope of the South China Sea, a suite of datasets, including 3D seismic data, well logs and in-situ borehole temperature measurements enable us to study the gas hydrate stability zone. In-situ borehole temperature measurements reveal a nonlinear geothermal gradient within shallow 200 m-thick marine sediments. The geothermal gradient fit with the uppermost sediment interval (<50 m) neglected produces a better match between the depths of predicted BGHSZ and observed BSR. The gas hydrate stability zone (GHSZ) modeling using in-situ borehole measurement information at Site W07 shows that the predicted BGHSZ agrees well with the imaged BSR located atop an inter-canyon ridge, demonstrating that the gas hydrate system is in a steady state. Two-dimensional GHSZ modeling along seismic profiles transecting the ridge shows that the observed BSRs along the western margin of the ridge are deeper than the predicted BGHSZ. We interpret this apparent discrepancy to be attributed to topographic effects. Two scales of topographic effects, i.e. an alternating distribution of canyons and inter-canyon ridges, and localized crests and troughs over the crest of inter-canyon ridges, are revealed to influence gas hydrate system in the study area. The curved BGHSZ resulted from the topographic effect could facilitate the concentration of gas hydrate by enlarging the accumulation space and sealing free gas immediately below BGHSZ. |
资助项目 | Youth Innovation Promotion Association, Chinese Academy of Sciences[2019360] ; National Key Research and Development Program of China[2018YFC0310105] ; National Key Research and Development Program of China[2019YFC0312301] ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)[311021003] |
WOS关键词 | SEISMIC DATA ; SHENHU AREA ; FLUID-FLOW ; HEAT-FLOW ; OFFSHORE ; RESERVOIR ; SYSTEMS ; BENEATH ; ESCAPE ; RIDGE |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | ELSEVIER SCI LTD |
WOS记录号 | WOS:000702878500003 |
资助机构 | Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Key Research and Development Program of China ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) |
内容类型 | 期刊论文 |
源URL | [http://ir.idsse.ac.cn/handle/183446/8859] |
专题 | 深海科学研究部_深海地球物理与资源研究室 |
通讯作者 | Wang, Jiliang |
作者单位 | 1.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519080, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.State Key Lab Nat Gas Hydrate, Beijing 100027, Peoples R China 4.CNOOC Res Inst Co Ltd, Beijing 100027, Peoples R China 5.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China |
推荐引用方式 GB/T 7714 | Wang, Jiliang,Wu, Shiguo,Sun, Jin,et al. Influence of seafloor topography on gas hydrate occurrence across a submarine canyon-incised continental slope in the northern margin of the south china sea[J]. MARINE AND PETROLEUM GEOLOGY,2021,133:19. |
APA | Wang, Jiliang,Wu, Shiguo,Sun, Jin,Feng, Wanli,&Li, Qingping.(2021).Influence of seafloor topography on gas hydrate occurrence across a submarine canyon-incised continental slope in the northern margin of the south china sea.MARINE AND PETROLEUM GEOLOGY,133,19. |
MLA | Wang, Jiliang,et al."Influence of seafloor topography on gas hydrate occurrence across a submarine canyon-incised continental slope in the northern margin of the south china sea".MARINE AND PETROLEUM GEOLOGY 133(2021):19. |
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