大地电磁测深法在断裂识别中的应用

Application of Magnetotelluric Method in Fault Identification

断裂识别对找矿、找地下水、找油气以及水利工程建设都有重要意义,由于其特殊的构造特征往往是矿液、地下水循环和油气运移富集的重要“通道”。在地球物理勘探工作中对局部断裂构造的识别方法有很多,应用大地电磁测深方法从电性差异的基础上对藏北高原库木库里测区内部隐伏断裂的识别效果进行研究和分析,结果表明该方法对于识别浅层断裂构造有较高的有效性和准确性,且较适用于地层电阻率差异较大的地区。

Fault identification is of great significance for prospecting,groundwater exploration,oil and gas exploration and water conservancy project construction.Because of its special structural characteristics,it is often an important’channel’for ore fluid,groundwater circulation and oil and gas migration and enrichment.There are many identification methods for local fault structures in geophysical exploration.The geomagnetic method is used to study and analyze the identification effect of the hidden faults in the Kumukuli measurement area of the Northern Tibet Plateau from the basis of electrical differences.The results show that the proposed method has high effectiveness and accuracy for identifying shallow fracture structures,and it is more suitable for areas with large differences in formation resistivity.