地球物理测井在多年冻土厚度和地下冰调查中的应用

基于青藏高原多年冻土区三个钻孔的地球物理测井数据和钻孔编录资料,我们对多年冻土厚度和多年冻土层内地下冰与地球物理测井数据之间的关系进行了相关的分析研究.研究表明,当地层为土壤类型时,可以使用井径和侧向测井曲线来判断多年冻土层厚度;而当地层为致密的基岩时,不能使用上述两种测井曲线来判断多年冻土层厚度.此外,还可以使用长源距伽马-伽马曲线和侧向测井曲线来识别多年冻土层内部分地下冰层的位置,其前提条件是地下冰层具有一定的厚度,或即使厚度较薄,但连续出现.这一研究结果对于利用地球物理测井曲线来调查多年冻土情况具有一定的应用价值.

Application of geophysical logging in the surveys of permafrost thickness and underground ice

Based on geophysical borehole logging data and catalog information of the three boreholes in permafrost regions of the Qinghai-Tibet Plateau, the relations between geophysical logging data and permafrost thickness as well as the distribution of underground ice were analyzed. The result shows that in soils, the caliper data and lateral resistivity data can be used to find the permafrost thickness; but in rocks, the abovementioned methods are not effective. In addition, the gamma-gamma data and the lateral resistivity data can be used to distinguish the distribution of the underground ice if the underground ice has a certain thickness or is thin but closely spaced. The research may have application values to using geophysical logging for the survey of permafrost.