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海底沉积物中天然气水合物形成过程数值模拟:以深部流体向上供给甲烷为背景
Alternative TitleMATHEMATICAL SIMULATION FOR SUBMARINE GAS HYDRATE FORMATION: UPON THE ASSUMPTION OF UPWARD ADVECTION OF METHANE-BEARING POREWATER
张辉1,2; 杨睿1,2; 匡增桂1,3; 黄丽4; 阎贫5
2017-02
Source Publication海洋地质与第四纪地质
ISSN0256-1492
Volume37Issue:1Pages:107-116
Abstract为深入了解深部上升流体供应甲烷的海底沉积环境中天然气水合物的形成和聚集过程,综合沉积作用、深部上升甲烷流体的对流和扩散作用、甲烷溶解度控制水合物形成等物理过程,建立了天然气水合物形成过程的数学模型,研究水合物在空间和时间尺度上的形成过程。模型通过3个无量纲参数(沉积压实引起的孔隙流体对流与扩散的比率Pe1、深部流体向上对流传输与扩散的比率Pe2、深部上升流体的甲烷含量Cm,est^1),形象地描述了天然气水合物在海底沉积中的聚集过程。数值模拟研究表明,天然气水合物首先在稳定带内上部某一位置形成,随后由于沉积作用向下延伸而在稳定带底部形成水合物;水合物演化时间与Pe1、Pez及Cm,est^1呈负相关;水合物含量与Pe1、Cm,est^1负相关,而与Pe2正相关。甲烷溶解度曲线对水合物形成和分布有重要影响,但深部上升流体的甲烷含量、上升流体的通量决定了整个水合物系统甲烷量的输入和输出,是海底天然气水合物形成的主要控制因素。
Other AbstractSea bottom gas hydrate (GH) may be formed by porewater advecting upward from deep. In order to understand this process, we developed a non-dimensional mathematical model, combining together the sedimentary process, methane transporting by convection and diffusion of fluid upward, and methane solu bility, for study of GH formation and accumulation in a temporal and spatial framework. The model de- scribes the process of GH formation and accumulation with 3 dimensionless parameters, Pe1 , Pc2, Cm,est^1 which represents respectively the sedimentary process, porewater advection upward from deep and meth- ane content in the fluid. GH emerges in the upper gas hydrate stability zone (GHSZ) first, then grows downward within the continuous sedimentary deposits, and extends eventually to the base of GHSZ. There is a negative correlation between GH evolution time and the three parameters of Pel, Pc2, Cm,est^1 and between GH concentration and Pel, Cm,est^1, but a positive correlation between GH concentration, evo- lution time and upward methane flux (Pe2 and Cm,est^1 ). The methane solubility influences greatly on the GH formation and distribution. But the simulation results suggest that both the methane concentration of fluid flow from deep and its flux control the methane inputs and outputs of the hydrate system. They are not in- eluded in the solubility-curve. So we propose the methane concentration of porewater upward and its flux as controlling factors.
Keyword天然气水合物 海底上升流体 数值模拟 gas hydrate submarine porewater advection upward mathematical simulation
DOI10.16562/j.cnki.0256-1492.2017.01.013
Language中文
Citation statistics
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/16578
Collection中国科学院广州能源研究所
Corresponding Author杨睿
Affiliation1.国土资源部海底矿产资源重点实验室,广州510075;
2.中国科学院天然气水合物重点实验室,中国科学院广州能源研究所,广州510640;
3.广州海洋地质调查局,广州510075;
4.国土资源部天然气水合物重点实验室,青岛海洋地质研究所,青岛266071;
5.中国科学院边缘海地质重点实验室,中国科学院南海海洋研究所,广州510301
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
张辉,杨睿,匡增桂,等. 海底沉积物中天然气水合物形成过程数值模拟:以深部流体向上供给甲烷为背景[J]. 海洋地质与第四纪地质,2017,37(1):107-116.
APA 张辉,杨睿,匡增桂,黄丽,&阎贫.(2017).海底沉积物中天然气水合物形成过程数值模拟:以深部流体向上供给甲烷为背景.海洋地质与第四纪地质,37(1),107-116.
MLA 张辉,et al."海底沉积物中天然气水合物形成过程数值模拟:以深部流体向上供给甲烷为背景".海洋地质与第四纪地质 37.1(2017):107-116.
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