Abstract

The paper presents the techniques and results of the joint interpretation of AMTS and RMT-C tensor data in the area of the Karelian Isthmus near the village of Yablonovka, promising for the discovery of primary diamond sources. Earlier, according to drilling data, fluid-cataclastic breccias, fluidolites, were identified here, which, according to modern geological concepts, can be primary diamond sources. The area is located in the marginal part of the Pasha-Ladoga rift zone and is characterized by a complex three-dimensional structure. Under these conditions, in the presence of a system of multidirectional faults, the joint interpretation of the AMTS and RMT-C tensor data was performed within a 3D model of the medium. To reduce the inversion execution time, an approach and a procedure for transforming the RMT-C data obtained in the intermediate-field zone of a controlled source to sounding curves corresponding to the plane-wave model are proposed. The transformed RMT-C apparent resistivity curves were also used to correct the static displacements of the AMTS curves. A joint 3D inversion was performed taking into account the relief. The resulting model is in good agreement with the geological data obtained from the wells previously drilled near the study area. The geoelectric sections show zones of relatively increased resistivity, which may be associated with fluidolites. The developed approaches to the joint 3D interpretation of AMTS and RMT-C tensor data and the obtained information about the structure and properties of the basement rocks, fluidolite-hosting rocks, and overlying sedimentary deposits, can be used in prospecting works for diamonds on the Karelian Isthmus and adjacent territories.

中文翻译：

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联合三维解释 AMTS 和 RMT-C 张量数据在一个地区寻找主要钻石来源（卡累利阿地峡）的前景

摘要

本文介绍了在 Yablonovka 村附近卡累利阿地峡地区 AMTS 和 RMT-C 张量数据联合解释的技术和结果，有望发现主要钻石来源。早些时候，根据钻探数据，这里发现了流体碎裂角砾岩、流体岩，根据现代地质概念，它们可能是主要的钻石来源。该区位于帕夏-拉多加裂谷带边缘部分，具有复杂的三维结构特征。在这些条件下，在存在多向断层系统的情况下，在介质的 3D 模型内对 AMTS 和 RMT-C 张量数据进行联合解释。为了减少反演执行时间，提出了一种将受控源中场区获得的RMT-C数据转换为与平面波模型相对应的探空曲线的方法和程序。转换后的 RMT-C 视电阻率曲线还用于校正 AMTS 曲线的静态位移。考虑到地形，进行了联合 3D 反演。由此产生的模型与从研究区域附近先前钻探的井获得的地质数据非常吻合。地电剖面显示电阻率相对增加的区域，这可能与流岩有关。开发的 AMTS 和 RMT-C 张量数据联合 3D 解释方法以及获得的有关基岩、流岩质岩石的结构和性质的信息，