南海北部神狐海域沉积物颗粒对天然气水合物聚集的主要影响

发布时间：2018-04-20 12:04

本文选题：天然气水合物饱和度 + 沉积物粒度　；参考：《科学通报》2016年03期

【摘要】：天然气水合物在海底沉积物中的饱和度是对其资源评价的重要参数.掌握水合物饱和度的影响因素对其能源和气候环境效应的评估有重要的意义.沉积物粒度属性与水合物饱和度的关系,几十年来仍停留在简单统计和定性认识层面.本研究以南海神狐SH3站位样品为研究对象进行粒度、比表面积的测量,以此为基础建立模型表征沉积孔隙大小、水合物相平衡改变量,探讨沉积物颗粒对天然气水合物饱和度的影响及其影响机理.实验结果显示,水合物产出于极细粉砂层(粉砂含量60%).赋存水合物的地层含有极细砂以上的粗粒组分(10%),而其上覆和下伏不含水合物的地层不含有这一粗粒组分.天然气水合物饱和度并非简单依赖于砂(63mm)的含量,而与较粗的部分砂(125mm)含量统计上存在更好的相关性.沉积颗粒的比表面积呈现较为平滑的走势,水合物产出层位的沉积物具有较小的比表面积(8~14 m~2/g),而不含水合物的层位其比表面积16 m~2/g.孔隙度一定的前提下,沉积孔隙的大小主要由沉积颗粒的比表面积决定,且两者呈反比关系.沉积物颗粒的比表面积比其粒度更有优势,与水合物饱和度呈现良好的相关性,可用以定量化分析沉积孔隙大小、天然气水合物相平衡条件的改变,是研究沉积物颗粒影响天然气水合物分布有效且经济的参数指标,同时也还需要大量实验的验证或改进.
[Abstract]:The saturation of natural gas hydrate in the seafloor is an important parameter for the evaluation of its resources. It is of great significance to master the influence factors of hydrate saturation on its energy and climate environmental effects. The relationship between the grain size property of the sediment and the saturation of the hydrate remains in a simple statistical and qualitative understanding for several decades. In this study, the particle size and specific surface area were measured with the sample of SH3 station in the South China Sea as the research object. On this basis, the size of the pore size, the change of the hydrate phase equilibrium and the effect of the sediment particles on the gas hydrate saturation were investigated and the influence mechanism of the sediment particles on the gas hydrate saturation was discussed. The experimental results showed that the hydrate was produced from the very fine silt sand. The layer (silt content is 60%). The formation of the accumulation of hydrates contains coarse-grained coarse-grained components (10%), while its overlying and lower volt free formations do not contain this coarse fraction. The saturation of gas hydrate is not simply dependent on the content of sand (63mm), but has a better correlation with the coarser part of the sand (125mm). The specific surface area of the deposited particles shows a relatively smooth trend, and the sediment at the production layer has a smaller specific surface area (8~14 m~2/g), but the pore size of the hydrate free layer is 16 m~2/g. with a certain porosity, and the size of the sedimentary pore is mainly determined by the specific surface area of the sedimentary particles, and the sedimentation is inversely proportional. The specific surface area of the product particles is more advantageous than the particle size, and has a good correlation with the hydrate saturation. It can be used to quantitatively analyze the size of the sedimentary pores and the change of the equilibrium conditions of the gas hydrate phase. It is an effective and economical parameter to study the effect of sediment particles on the distribution of natural gas hydrate. Verification or improvement.

【作者单位】：中国科学院广州能源研究所中国科学院天然气水合物重点实验室;北京大学工学院能源与资源工程系;广州海洋地质调查局;
【基金】：中国科学院重点部署项目(KGZD-EW-301);中国科学院国家外国专家局创新团队国际合作伙伴计划;中国科学院广州能源研究所所长基金(y007r51001)资助中国地质调查局地质调查项目(GHZ2012006003) 广东省博士启动项目(S2013040013738)
【分类号】：P618.13

【共引文献】