Analytical research on evolution of methane hydrate deposits at Shenhu Area, northern South China Sea

doi:10.6038/j.issn.0001-5733.2012.05.034

GIEC OpenIR > 中国科学院广州能源研究所

	Analytical research on evolution of methane hydrate deposits at Shenhu Area, northern South China Sea
	Su Zheng1,2 ; Cao Yun-Cheng 1,3; Yang Rui1,2 ; Wu Neng-You1,2 ; Yang Sheng-Xiong 4; Wang Hong-Bin 4
	2012-05-01
发表期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
卷号	55 期号:5 页码:1764-1774
摘要	Geological conditions for gas hydrate formation have been naturally prepared on the northern continental slope of the South China Sea. Shenhu Area is currently regarded as one of the promising targets for gas hydrate exploration and exploitation. However, the methane hydrate at Shenhu Area concentrates at base of hydrate stability zone (HSZ) and is of high saturation. The feature differs from that of the typical hydrates dominated by low methane flux. The reservoir-forming mechanism and controlling factors are not clearly understood. In this paper a one-dimensional kinetic model is constructed for investigating the evolution of special hydrate. The model includes sedimentation compaction, methane solubility, and hydrate formation and sediment permeability, and has two controlling parameters of sedimentation rate at seafloor and water flux. At a constant methane concentration in pore water, water flux determines transfer rate of dissolved methane gas and gas supply into the HSZ. The model is applied to compute the process of hydrate accumulation in the sediment at Shenhu Area. We discuss the hydrate reservoir and distribution under the given conditions of sedimentation rate and water flux, and compare the model results with observed data. The modeled results of hydrate formation based on the current sedimentation rates and water flow rates are much different from the measured values to some extent. Surprisingly the simulation matches the hydrate distribution well at an initial condition of 16 similar to 20% hydrate existing in pores of the old sediment. The results imply that a large amount of gas hydrates existed in the early sediment at Shenhu Area, the sediment evolved by inheriting the old hydrates and herewith produced the current feature of hydrate distribution, and that the hydrate content in the area is decreasing.
文章类型	Article
关键词	Shenhu Area Gas Hydrate Hydrate Saturation Reservoir Evolution Numerical Modeling
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.6038/j.issn.0001-5733.2012.05.034
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	GAS HYDRATE ; MARINE-SEDIMENTS ; POROUS-MEDIA ; BLAKE RIDGE ; ACCUMULATION ; CONSTRAINTS ; SOLUBILITY ; COMPACTION ; STABILITY ; TRANSPORT
收录类别	SCI
语种	英语
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000304734300034
引用统计	被引频次：11[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/344007/10588
专题	中国科学院广州能源研究所
作者单位	1.Chinese Acad Sci, Guangzhou Ctr Gas Hydrate Res, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Key Lab Renewable Energy & Gas Hydrate, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China 3.Chinese Acad Sci, Key Lab Marginal Sea Geol, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China 4.Guangzhou Marine Geol Survey, Guangzhou 510075, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Su Zheng,Cao Yun-Cheng,Yang Rui,et al. Analytical research on evolution of methane hydrate deposits at Shenhu Area, northern South China Sea[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2012,55(5):1764-1774.
APA	Su Zheng,Cao Yun-Cheng,Yang Rui,Wu Neng-You,Yang Sheng-Xiong,&Wang Hong-Bin.(2012).Analytical research on evolution of methane hydrate deposits at Shenhu Area, northern South China Sea.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,55(5),1764-1774.
MLA	Su Zheng,et al."Analytical research on evolution of methane hydrate deposits at Shenhu Area, northern South China Sea".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 55.5(2012):1764-1774.