Abstract

The results of a comprehensive study of electrical properties of the upper part of the Earth’s crust according to the data of lateral resistivity logging of the Kola SG-3 superdeep borehole and the results of deep and superdeep sounding using controlled sources and electrical profiling on the daylight surface are presented. The possibility of extrapolation of the Kola SG-3 temperature field to a depth below the bottomhole, up to the Moho discontinuity, taking into account the data MHD sounding with the Khibiny source and with the use of industrial power transmission lines (FENICS experiment) is considered. The results of frequency electromagnetic soundings with controlled sources are analyzed, and their geodynamic interpretation is performed together with the data of drilling the SG-3 borehole. The geological and geophysical data are interpreted in the Kola SG-3 section and on the daylight surface to search for homologs and define the nature of the intermediate conductive layer of the dilatancy-diffusion nature (DD layer) discovered in the Earth’s crust of the Baltic Shield at depths from 2–3 to 7–8 km. Based on the latest results of remote deep sounding (the Murman-2018 experiment), it is concluded that, in the vicinity of Kola SG-3 at a depth of 10–12 km, there is a boundary of “impenetrability” for direct current (for the galvanic mode). The geodynamic interpretation of the data is carried out taking into account the model by V.N. Nikolaevskii (1996); it has been suggested that the new boundary most closely corresponds to the brittle-to-quasi-plastic transition area of the Earth’s crust. The results are compared to the log data of the SG-3 borehole and the data of superdeep drilling.

中文翻译：

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可乐SG-3超深井孔五十周年

摘要

根据可乐SG-3超深井眼的侧向电阻率测井数据以及使用可控源和日光下的电剖面进行深，超深测深的结果，对地壳上部的电学特性进行全面研究的结果表面。考虑到Khibiny源和工业输电线路的MHD探测数据，将Kola SG-3温度场外推到井底以下深度直至Moho不连续性的可能性是（FENICS实验）经过考虑的。分析了具有可控源的频率电磁测深的结果，并与SG-3钻孔数据一起进行了地球动力学解释。在Kola SG-3部分和日光表面上解释地质和地球物理数据，以寻找同系物，并定义在波罗的海地壳中发现的扩散扩散性中间导电层（DD层）的性质在2–3至7–8 km的深度进行屏蔽。根据遥测的最新结果（Murman-2018实验），得出的结论是，在10-12 km深度的Kola SG-3附近，直流存在“不可穿透性”边界（用于电流模式）。VN Nikolaevskii（1996）考虑了该模型，对数据进行了地球动力学解释。有人提出，新边界最接近地壳的脆性到准塑性过渡区域。