义棠矿煤系灰岩水文地质特征及其与瓦斯富集的关系

Hydrogeological Characteristics of Coal Limestone in Yitang Coal Mine and Its Relationship with Gas Enrichment

针对义棠煤矿煤层顶板灰岩瓦斯涌出量大的问题,利用太原组灰岩水水位、离子浓度、氢氧稳定同位素和灰岩瓦斯抽采数据及其与煤层瓦斯含量对比分析,得出灰岩水对灰岩具有强烈溶蚀作用,改造K2、K3、K4灰岩成为瓦斯富集的有利储层;瓦斯通过地下水的运移及灰岩裂隙的输导作用,最终富集于大西庄背斜灰岩储层,并有上覆泥页岩进行封闭。解释了研究区灰岩水文地质特征与瓦斯富集的关系,这对义棠矿安全生产以及开采瓦斯资源有重要指导意义。

In view of the large amount of gas emission from the limestone in Yitang mine,analyze water level elevation,ionic concentration,hydrogen and oxygen stable isotope of limestone water of Taiyuan formation and gas extraction data of limestone and its comparison of gas content with coal seam.It is concluded that limestone water has a strong dissolution to limestone,made K2,K3 and K4 limestones to be the favorable reservoirs for gas enrichment.Through the movement of groundwater and the transport of limestone fissures,gas enriched in limestone reservoir of Daxizhuang anticline finally,closed with shale.Interpreted the relationship between the hydrogeological characteristics of limestone and gas enrichment in the study area.It has important guiding significance for the safe production and exploitation of gas resources in Yitang mine.