Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
| Analytical research on evolution of methane hydrate deposits at Shenhu Area, northern South China Sea | |
Su Zheng1,2 ; Cao Yun-Cheng1,3; Yang Rui1,2; Wu Neng-You1,2; Yang Sheng-Xiong4; Wang Hong-Bin4
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| 2012-05-01 | |
| Source Publication | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
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| Volume | 55Issue:5Pages:1764-1774 |
| Abstract | 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. |
| Subtype | Article |
| Keyword | Shenhu Area Gas Hydrate Hydrate Saturation Reservoir Evolution Numerical Modeling |
| WOS Headings | Science & Technology ; Physical Sciences |
| DOI | 10.6038/j.issn.0001-5733.2012.05.034 |
| WOS Subject Extended | Geochemistry & Geophysics |
| WOS Keyword | GAS HYDRATE ; MARINE-SEDIMENTS ; POROUS-MEDIA ; BLAKE RIDGE ; ACCUMULATION ; CONSTRAINTS ; SOLUBILITY ; COMPACTION ; STABILITY ; TRANSPORT |
| Indexed By | SCI |
| Language | 英语 |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000304734300034 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.giec.ac.cn/handle/344007/10588 |
| Collection | 中国科学院广州能源研究所 |
| Affiliation | 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 |
| Recommended Citation 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. |
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