勃利盆地影响瓦斯抽放的地质因素

发布时间：2019-02-13 09:21

【摘要】：针对勃利盆地随生产矿井开采深度增加,进入瓦斯事故高发阶段,为治理瓦斯,需采用超前抽放,然而,能否达到预期的效果,受诸多的地质因素影响,因此,有必要开展影响瓦斯抽放地质因素研究;通过影响瓦斯抽放的煤层孔隙性、渗透性、瓦斯压力、围岩储层物性特征和地质构造特征的分析,得出勃利盆地煤层孔隙多以微小孔为主,煤层吸附瓦斯量较多,游离瓦斯较少,瓦斯释放困难;煤层渗透率不高,瓦斯压力较小,瓦斯运移困难,不利于瓦斯抽放;围岩储层瓦斯含量低,渗透率低,瓦斯抽放效果不理想,综合得出勃利盆地的地质条件不利于瓦斯抽放.因面割理走向为NWW向、一组构造节理为NNW向,在现今应力场下表现为张扭性,为治理瓦斯采用超前抽放,在加密布置抽放孔的同时,抽放孔应沿着NE-SW向钻进,才能获得良好的效果.
[Abstract]:With the increase of mining depth in Boli Basin, gas accident is at a high stage. In order to control gas, it is necessary to adopt advanced drainage. However, whether the expected effect can be achieved is affected by many geological factors. It is necessary to study the geological factors affecting gas drainage. Based on the analysis of porosity, permeability, gas pressure, physical properties of surrounding rock reservoir and geological structure characteristics of coal seams which affect gas drainage, it is concluded that the pores of coal seams in Boli basin are mainly micro-pores, and the amount of gas adsorbed by coal seams is more. The free gas is less and it is difficult to release the gas. Coal seam permeability is not high, gas pressure is small, gas migration is difficult, is not conducive to gas drainage; surrounding rock reservoir gas content is low, permeability is low, gas drainage effect is not ideal, it is concluded that the geological conditions are not conducive to gas drainage. Because the strike of surface cleavage is NWW and a group of structural joints is NNW, it is tensional and torsional under the present stress field. In order to control gas, the drainage holes should be drilled along the direction of NE-SW while the drainage holes are infilled and arranged at the same time. In order to get good results.
【作者单位】：辽宁工程技术大学矿业学院;中国建筑材料工业地质勘查中心辽宁总队;
【分类号】：TD163

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