Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea

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	Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea
	Wang, Xiujuan ; Wu, Shiguo ; Xu, Ning ; Zhang, Guangxue
刊名	TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
	2006-12-01
卷号	17 期号:4 页码:799-813
关键词	Gas Hydrate Free Gas Saturation Acoustic Impedance South China Sea
ISSN号	1017-0839
文献子类	Article
英文摘要	Bottom-simulating reflectors (BSRs) were observed beneath the seafloor in the northern continental margin of the South China Sea (SCS). Acoustic impedance profile was derived by Constrained Sparse Spike Inversion (CSSI) method to provide information on rock properties and to estimate gas hydrate or free gas saturations in the sediments where BSRs are present. In general, gas hydrate-bearing sediments have positive impedance anomalies and free gas-bearing sediments have negative impedance anomalies. Based on well log data and Archie's equation, gas hydrate saturation can be estimated. But in regions where well log data is not available, a quantitative estimate of gas hydrate or free gas saturation is inferred by fitting the theoretical acoustic impedance to sediment impedance obtained by CSSI. Our study suggests that gas hydrate saturation in the Taixinan Basin is about 10 - 20% of the pore space, with the highest value of 50%, and free gas saturation below BSR is about 2 - 3% of the pore space, that can rise to 8 - 10% at a topographic high. The free gas is non-continuous and has low content in the southeastern slope of the Dongsha Islands. Moreover, BSR in the northern continental margin of the SCS is related to the presence of free gas. BSR is strong where free gas occurs.; Bottom-simulating reflectors (BSRs) were observed beneath the seafloor in the northern continental margin of the South China Sea (SCS). Acoustic impedance profile was derived by Constrained Sparse Spike Inversion (CSSI) method to provide information on rock properties and to estimate gas hydrate or free gas saturations in the sediments where BSRs are present. In general, gas hydrate-bearing sediments have positive impedance anomalies and free gas-bearing sediments have negative impedance anomalies. Based on well log data and Archie's equation, gas hydrate saturation can be estimated. But in regions where well log data is not available, a quantitative estimate of gas hydrate or free gas saturation is inferred by fitting the theoretical acoustic impedance to sediment impedance obtained by CSSI. Our study suggests that gas hydrate saturation in the Taixinan Basin is about 10 - 20% of the pore space, with the highest value of 50%, and free gas saturation below BSR is about 2 - 3% of the pore space, that can rise to 8 - 10% at a topographic high. The free gas is non-continuous and has low content in the southeastern slope of the Dongsha Islands. Moreover, BSR in the northern continental margin of the SCS is related to the presence of free gas. BSR is strong where free gas occurs.
学科主题	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Oceanography
语种	英语
WOS记录号	WOS:000243814800011
公开日期	2010-12-24
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/5135]
专题	海洋研究所_海洋地质与环境重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 3.China Univ Petr, Dongying, Peoples R China 4.MLR, Guangzhou Marine Geol Survey, Guangzhou, Guangdong, Peoples R China 5.Chinese Acad Sci, Grad Sch, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xiujuan,Wu, Shiguo,Xu, Ning,et al. Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea[J]. TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,2006,17(4):799-813.
APA	Wang, Xiujuan,Wu, Shiguo,Xu, Ning,&Zhang, Guangxue.(2006).Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea.TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,17(4),799-813.
MLA	Wang, Xiujuan,et al."Estimation of gas hydrate saturation using constrained sparse spike inversion: Case study from the northern South China Sea".TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES 17.4(2006):799-813.