天然气水合物储层岩心保压转移与测试进展

Advances in pressure core transfer and testing technology of offshore hydrate-bearing sediments

掌握天然气水合物储层基础物性演化特征对提升天然气水合物资源勘查与试采综合实力具有重要意义。目前,天然气水合物储层基础物性模拟实验和测试仍然以人工制备的天然气水合物岩心样品为主,导致测试结果和模拟实验认识与天然气水合物资源勘查试采工程需求仍有一定的差距,亟需原位准原位物性测试数据进行对比校正。天然气水合物储层保压取心及其后续岩心保压转移与测试是积累准原位物性测试数据的有力手段。聚焦天然气水合物储层保压取心之后的岩心保压转移与测试,全面综述了国内外现有的天然气水合物储层岩心保压转移与测试系统的优缺点,深入分析了天然气水合物储层岩心保压转移与测试获得的基础性认识;综述国内天然气水合物储层保压取心系统研发现状,梳理与之配套的岩心保压转移与测试系统研发现状及其面临的挑战;针对面临的挑战,为发展中国海域天然气水合物储层保压转移与测试技术装备研发自主能力提出了建议。

It is of great significance to understand the evolution characteristics of basic physical properties of gas hydrate reservoir to promote the exploration and test production of gas hydrate resources.Currently,the simulation experiment and test of physical property of hydrate-bearing sediments is still given priority to artificial preparation of natural gas hydrate core samples,which results a certain gap between the test results and the understanding of the simulation experiment and the requirements of the testing production engineering of natural gas hydrate resources.As physical property testing data highly need to be compared and corrected in situ in the field,pressure coring,pressure core transfer and testing techniques of hydrate-bearing sediments is an effective means for the acquisition and accumulation of physical testing data.Based on the introduction of the pressure coring,pressure transfer and testing methods,its advantages and disadvantages at home and abroad are comprehensively summarized,and the basic understanding of the core transfer and testing of hydrate-bearing sediments is deeply analyzed.According to the research and development status of pressure core transfer and testing system of offshore hydrate-bearing sediments in China,the challenges in this field are summarized.Finally,in view of the challenges,suggestions are put forward for the independent research and development capability of pressure core transfer and testing technology of offshore hydrate-bearing sediments and its related equipment in China.