长株潭地区CSAMT法收发距探讨及实例分析

发布时间：2018-05-07 16:52

本文选题：长株潭地区 + 可控源音频大地电磁法　；参考：《中国有色金属学报》2017年02期

【摘要】：可控源音频大地电磁法(CSAMT)中的收发距和实测波区的响应数据息息相关,决定着该方法的有效勘探深度。长株潭地区是我国经济高度发展的重点区域,区内岩浆岩、褶皱、断裂发育;出露岩石有砾岩、砂岩、泥岩、白云岩、灰岩和花岗岩等,具有CSAMT探测地质构造和岩性接触带等地质现象的前提条件。但由于区内水系发育致使大部分岩石电阻率普遍较低,而花岗岩电阻率相对较高,在不同区域实施CSAMT时,满足波区条件的收发距有所不同。根据区内不同岩性组成的典型地层结构进行数值计算,计算出最佳收发距的大小,并选取实例进行分析,以期对此地区或者类似区域开展CSAMT法探测时有所参考。
[Abstract]:The distance between transceiver and receiver in the controlled source audio magnetotelluric method (CSAMT) is closely related to the response data of the measured wave area, which determines the effective exploration depth of the method. Changsha-Zhuzhou-Xiangtan area is the key area of high economic development in China. Magmatic rocks, folds and faults are developed in the area, and the exposed rocks include conglomerate, sandstone, mudstone, dolomite, limestone and granite, etc. There are preconditions for CSAMT to detect geological phenomena such as geological structure and lithologic contact zone. However, because of the development of water system in the region, the resistivity of most rocks is generally low, while the resistivity of granite is relatively high. When CSAMT is implemented in different regions, the transceiver distance satisfying the condition of wave region is different. According to the typical stratigraphic structure of different lithologic composition in this area, the size of the optimal transceiver distance is calculated, and an example is selected for analysis, in order to provide some reference for the exploration of CSAMT method in this area or similar area.
【作者单位】：湖南省地质调查院;有色资源与地质灾害探查湖南省重点实验室;中南大学地球科学与信息物理学院;
【分类号】：P631.3

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