井下直流电法超前探测低阻区水与瓦斯视电阻率响应分析
Analysis of Apparent Resistivity Response on Water and Gas in Low Resistivity Zone by Underground DC Advance Method
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摘要: 视电阻率对于水的响应较为敏感,为使用井下直流电法探测煤层中的瓦斯赋存,需要对煤层赋水状况与煤体瓦斯含量进行综合分析。根据赵家寨煤矿12205工作面三极超前直流电法探测,工作面内存在6处低阻异常区,其中4处低阻异常区经钻探验证富水性较好,瓦斯小,另外2处低阻异常区瓦斯含量较高,富水性差。矿井低阻异常区反映了煤层水大或瓦斯大的特点,但水大瓦斯小,水小瓦斯大,二者呈现此消彼长的关系,符合一般煤层瓦斯赋存规律。Abstract: The apparent resistivity is sensitive to water response. In order to detect the gas content in the roadway by using the direct current method, we need to synthetically analyze the gas content and groundwater in the coal seam. The test area is located in 12205 working face of Zhaojiazhai Coal Mine. There are 6 low-resistance anomaly areas in the working face, and 4 of them have good water-borne properties and low gas content. In the other two, the gas content of the low resistance abnormal zone is high and the water rich is poor. The low resistivity abnormal zone of mine reflects the characteristics of coal seam water or gas. But, when the groundwater is small, the gas content is small, and when the groundwater is small, the gas content is big, so, the relationship between the two is consistent with the normal gas occurrence of coal seam.
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Keywords:
- direct current method /
- three-electrode advanced method /
- mine water /
- gas /
- apparent resistivity
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