基于可控源音频大地电磁法的陷落柱精细探测
Fine detection of collapse columns based on controlled source audio-frequency magnetotelluric method
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摘要: 以黄玉川煤矿为例，针对矿区地质勘探发现的疑似陷落柱，但尚未明确其发育范围及其含水性问题，依据其地质与地球物理特征，利用可控源音频大地电磁法（CSAMT）对疑似陷落柱进行精细探查，采用二维Occam反演方法进行处理，结合地质资料对地质异常体电性响应特征进行分析，该电性异常存在明显的低阻电性响应特征，最终圈定了地质异常体范围，并且推断该异常为含水陷落柱引起，主要发育于6上#煤层附近到奥灰，在对应6#煤层位置处（深度395 m）直径约30 m，往深部直径增大，后期井下钻探验证了CSAMT探查结果的准确性。
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关键词:
- 可控源音频大地电磁法 /
- 陷落柱 /
- 精细探测 /
- Occam反演 /
- 富水性
Abstract: Taking Huangyuchuan Coal Mine as the research background, aiming at the problem that the suspected collapse column found in the geological exploration of the mining area has not yet been clear about its development range and water content, based on the geological and geophysical characteristics of the suspected collapse column, this paper adopts controlled source audio magnetotelluric method（ＣＳＡＭＴ） to finely investigate the suspected collapse columns and applies the 2D Occam inversion method to finely process the measured data and analyze the electrical response characteristics of the geological anomalies in combination with geological data. The electrical anomaly has obvious characteristics of low resistance electrical response, and finally delineated the geological anomaly and inferred that the anomaly is caused by a water-bearing collapse column. The collapse column is mainly developed in the 6# upper coal seam near the Ordovician limestone, and the diameter is about 30 m at the corresponding 6# coal seam position（depth 395 m）, and the diameter increases to the deep. Subsequent underground drilling verified the accuracy of the CSAMT exploration results. -
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