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为了了解羌塘盆地冻土层的结构,利用核磁共振测深(MRS)技术对羌塘盆地的两个研究区进行了野外勘探。结合室内实验及野外实际资料,冻土层基本无法引起仪器核磁共振响应是划分冻土层和探测水合物的重要证据。在钻井附近进行的MRS方法对试验点进行测量并采集到了NMR信号,分析认为是天然气水合物处在亚稳定状态,分解产生水或者液态烃,形成水-水合物-气三相共存的情况,引起了NMR反应。实践表明可以将MRS方法运用于探测陆域冻土带分布以及冻土带,该方法对于冻土层的结构划分具有十分重要的科学意义和应用价值。
In order to understand the structure of permafrost in the Qiangtang Basin, two fields studied in the Qiangtang Basin were explored by using MRS. Combined with laboratory experiments and actual field data, the permafrost can hardly cause the NMR response of the instrument to be an important evidence to divide the frozen soil layer and detect hydrate. The MRS method in the vicinity of the well bore measured the test points and collected NMR signals. The analysis shows that the natural gas hydrate is in a metastable state, decomposes to produce water or liquid hydrocarbons, and forms a water-hydrate-gas co-existence. Caused the NMR reaction. Practice shows that the MRS method can be used to detect the distribution of tundra and tundra in the land area. This method has very important scientific significance and application value for the structure division of permafrost.