邓帅;胡高伟;卜庆涛;

• 1:中国地质科学院
• 2:青岛海洋地质研究所自然资源部天然气水合物重点实验室
• 3:海洋国家实验室海洋矿产资源评价与探测技术功能实验室

摘要(Abstract)：

掌握影响天然气水合物(简称水合物)在海底沉积物中形成的因素对其能源和气候环境效应的评估有重要的意义。水合物的含量与沉积物颗粒的粒径紧密相关,水合物多产出于粗砂中。以人工样品为主的实验研究表明,由于孔隙半径产生的毛细管抑制压力,多孔介质的颗粒越细,孔隙越小,一定条件下稳定温度越低(或压力越高)。沉积物颗粒的比表面积与水合物饱和度呈现很高的相关性,比粒径更有优势。利用比表面积可以定量地表示粒径和孔隙大小之间的关系,量化分析孔隙大小对水合物形成的影响。此外,我国南海神狐海域水合物尽管赋存在细粒沉积物中,却具有较高的饱和度,这可能与南海沉积物中富含丰富的有孔虫壳体有关,通过微观层面的观察发现,这些古生物壳体不仅充当了沉积物中的粗砂部分,而且其多孔结构也使沉积孔隙空间增加,从而为水合物富集提供了有利的生长环境和便利的赋存空间。Klauda等的模型假定多孔介质孔径尺寸的概率密度分布函数为正态分布,新的相平衡模型包含了尺寸效应。颜荣涛等把有效孔隙半径和水合物饱和度联系起来,从而将水合物饱和度引入相平衡模型中。分形模型将分形参数与孔隙度建立了关系,但并没有与温压条件等进一步联系起来,对水合物形成和分解的影响还需做进一步的推导和实验。

关键词(KeyWords)： 水合物;粒径;比表面积;有孔虫;孔径分布

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2017YFC0307600);; 国家自然科学基金项目(41474119);; 中国地质调查局项目(DD20160219)

作者(Author): 邓帅;胡高伟;卜庆涛;

Email:

DOI: 10.19509/j.cnki.dzkq.2019.0406

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