Acoustic wave attenuation in the gas hydrate-bearing sediments of Well GC955H, Gulf of Mexico
Wang, Jiliang1; Wu, Shiguo1,2; Geng, Jianhua3; Jaiswal, Priyank4
2018-12-01
发表期刊MARINE GEOPHYSICAL RESEARCH
ISSN0025-3235
卷号39期号:4页码:509-522
摘要A better understanding of wave attenuation in hydrate-bearing sediments is necessary for the improved geophysical quantification of marine gas hydrates. Here we compare the attenuation behavior of hydrate-saturated vs water-saturated sediments at site GC955H, in the Gulf of Mexico, which was surveyed during the JIP Leg II expedition. We compute the P-wave attenuation of the gas hydrate bearing sediments using the median frequency shift method on the monopole waveforms. The results show that P-wave attenuation due to low saturation (<0.4) in hydrate-filled fractures of fine-grained sediment is comparable to that of the water-filled fracture case. On the contrary, P-wave attenuation due to high saturation (>0.4) in the hydrate-filled pores of coarse-grained sediments can be up to as much as three times more than that of the water-saturated case. The correlation analysis shows that the P-wave attenuation increases with the increasing gas hydrate saturation for the highly saturated gas hydrate-bearing sand interval while the correlation of the P-wave attenuation and hydrate saturation is weak for low saturated gas hydrate-bearing shale interval. The results show that P-wave attenuation is more likely to be used as a geophysical proxy for gas hydrate quantification of highly concentrated coarse-grained sediment rather than for that of fine-grained sediment. To examine the P-wave behavior in sand, we use the improved LCAM model, which accounts for physical factors such as grain boundary roughness and squirt flow to explain the observed differences in P-wave attenuation between hydrate and water-saturated coarse-grained sediment. Our results provide further geophysical evidences for P-wave behavior in the gas hydrate-bearing sediments in the field.
关键词Gas hydrate Sonic attenuation Well log Gulf of Mexico
DOI10.1007/s11001-017-9336-1
资助者National Natural Science Foundation of China ; State Key Laboratory of Marine Geology, Tongji University ; Major State Basic Research Development Program ; Sanya-Institute Cooperation Project ; DOE
语种英语
资助项目National Natural Science Foundation of China[41606072] ; State Key Laboratory of Marine Geology, Tongji University[MGK 1609] ; Major State Basic Research Development Program[2015CB251201] ; Sanya-Institute Cooperation Project[2016YD34] ; DOE
关键词[WOS]GREEN CANYON 955 ; METHANE HYDRATE ; MARINE-SEDIMENTS ; SEISMIC-WAVES ; ELASTIC PROPERTIES ; SATURATED ROCKS ; POROUS-MEDIA ; BLAKE RIDGE ; PROPAGATION ; VELOCITY
WOS研究方向Geochemistry & Geophysics ; Oceanography
WOS类目Geochemistry & Geophysics ; Oceanography
WOS记录号WOS:000450512900004
出版者SPRINGER
引用统计
文献类型期刊论文
条目标识符http://ir.idsse.ac.cn/handle/183446/6348
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.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
3.Tongji Univ, State Lab Marine Geol, Shanghai 200092, Peoples R China
4.Oklahoma State Univ, Boone Pickens Sch Geol, Stillwater, OK 74078 USA
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Wang, Jiliang,Wu, Shiguo,Geng, Jianhua,et al. Acoustic wave attenuation in the gas hydrate-bearing sediments of Well GC955H, Gulf of Mexico[J]. MARINE GEOPHYSICAL RESEARCH,2018,39(4):509-522.
APA Wang, Jiliang,Wu, Shiguo,Geng, Jianhua,&Jaiswal, Priyank.(2018).Acoustic wave attenuation in the gas hydrate-bearing sediments of Well GC955H, Gulf of Mexico.MARINE GEOPHYSICAL RESEARCH,39(4),509-522.
MLA Wang, Jiliang,et al."Acoustic wave attenuation in the gas hydrate-bearing sediments of Well GC955H, Gulf of Mexico".MARINE GEOPHYSICAL RESEARCH 39.4(2018):509-522.
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