Gas hydrate quantification using full-waveform inversion of sparse ocean-bottom seismic data: A case study from Green Canyon Block 955, Gulf of Mexico
Wang, Jiliang1; Jaiswal, Priyank2; Haines, Seth S.3; Hart, Patrick E.4; Wu, Shiguo1
2018-07-01
发表期刊GEOPHYSICS
ISSN0016-8033
卷号83期号:4页码:B167-B181
摘要We present a case study of gas hydrate quantification using dense short-offset multichannel seismic (MCS) and sparse long-offset ocean-bottom-seismometer (OBS) data in lease block Green Canyon 955 (GC955), Gulf of Mexico (GOM), where the presence of gas hydrate was interpreted using logging while drilling (LWD) data acquired by the GOM Gas Hydrate Joint Industry Project Leg II expedition. We use frequency-domain full-waveform inversion (FWI) of seven OBS gathers to invert for a P-wave velocity model of an approximately 7 km long MCS profile connecting two LWD sites, GC955-H and GC955-Q. We build the starting model for FWI using traveltime inversion (TI) of the MCS and OBS data. In addition, we use the TI model for depth migrating the MCS stack. At the LWD sites, we constrain the hydrate saturation (S-gh) using sonic and resistivity logs. Unfortunately, as is typical of seismic quantification problems, the FWI model resolution is not sufficient to extrapolate the LWD-based S-gh. Therefore, we apply Backus averaging to the sonic log, at 60 m wavelength, bringing it within approximately 8% of the FWI model and make the assumption that averaging the sonic log is same as redistributing the gas hydrate within the Backus wavelength. In this manner, instead of S-gh, the FWI model is able to estimate the total gas hydrate volume. In the end, we use the FWI model and the migrated stack to constrain the locations and bulk volumes of free gas and gas hydrate. Our results demonstrate that with careful processing, reasonable estimates on locations and bulk volumes of submarine gas hydrate accumulations can be achieved even with sparse seismic data that are not adequate for amplitude-based assessments.
DOI10.1190/GEO2017-0414.1
资助者DOE ; BOEM ; National Natural Science Foundation of China ; National Program on Key Basic Research Project (973 Program) ; Chinese Scholarship Council ; Jaiswal at the Boone Pickens School of Geology (BPSG), Oklahoma State University, USA
语种英语
关键词[WOS]PROJECT LEG II ; TRAVEL-TIME INVERSION ; SOUTH CHINA SEA ; VELOCITY STRUCTURE ; SIMULATING REFLECTORS ; BEARING SEDIMENTS ; MARINE-SEDIMENTS ; METHANE HYDRATE ; ROCK PHYSICS ; ELASTIC PROPERTIES
资助项目DOE[DE-FE0002911] ; DOE[DE-FE0009904] ; BOEM[10PG00239] ; National Natural Science Foundation of China[41606072] ; National Program on Key Basic Research Project (973 Program)[2015CB251201] ; Chinese Scholarship Council ; Jaiswal at the Boone Pickens School of Geology (BPSG), Oklahoma State University, USA
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000443597500026
出版者SOC EXPLORATION GEOPHYSICISTS
引用统计
文献类型期刊论文
条目标识符http://ir.idsse.ac.cn/handle/183446/6351
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.Oklahoma State Univ, Stillwater, OK 74078 USA
3.US Geol Survey, Box 25046, Denver, CO 80225 USA
4.US Geol Survey, Santa Cruz, CA 95060 USA
第一作者单位中国科学院深海科学与工程研究所
通讯作者单位中国科学院深海科学与工程研究所
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GB/T 7714
Wang, Jiliang,Jaiswal, Priyank,Haines, Seth S.,et al. Gas hydrate quantification using full-waveform inversion of sparse ocean-bottom seismic data: A case study from Green Canyon Block 955, Gulf of Mexico[J]. GEOPHYSICS,2018,83(4):B167-B181.
APA Wang, Jiliang,Jaiswal, Priyank,Haines, Seth S.,Hart, Patrick E.,&Wu, Shiguo.(2018).Gas hydrate quantification using full-waveform inversion of sparse ocean-bottom seismic data: A case study from Green Canyon Block 955, Gulf of Mexico.GEOPHYSICS,83(4),B167-B181.
MLA Wang, Jiliang,et al."Gas hydrate quantification using full-waveform inversion of sparse ocean-bottom seismic data: A case study from Green Canyon Block 955, Gulf of Mexico".GEOPHYSICS 83.4(2018):B167-B181.
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