摘要
为研究影响勃利盆地瓦斯抽放地质因素问题;通过分析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,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.煤岩裂隙在现今应力场下表现为张扭性,是瓦斯运移的主要通道,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.
With the increasing of production mining depth of Boli basin, gas accident is entering into the high stage. In order to control the gas accident, advanced drainage is required. However, it depends on many geological factors whether drainage can achieve the desired effect. So, it is necessary to study the geological factors of gas drainage. By the analysis of the coal seam porosity, permeability and gas pressure, wall rock＇ reservoir property features, and geological structure features, the results of study show that the basin coal seam porosity is mainly with tiny holes, adsorption quantity of coal seam gas is more, the free gas is less, and gas release is difficult. Coal seam permeability is not high, gas pressure is smaller, gas migration is difficult, and it is not good for gas drainage Reservoir gas content of wall rock is low, and permeability is low, and gas drainage effect is not ideal. The geological conditions of Boll basin are bad for gas drainage. Coal rock crack has been performance tenso-shear structural plane in the current stress field, is the main channel of gas migration. In order to obtain better effect in governance gas, the advanced drainage is adapted, additional drainage holes are set up and the drainage holes should be set up along NE-SW direction.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2015年第7期797-800,805,共5页
Journal of Liaoning Technical University (Natural Science)
基金
辽宁省教育厅科学技术研究项目(L2010157)
关键词
勃利盆地
地质因素
瓦斯抽放
瓦斯压力
渗透率
Boli basin
geological factors
gas drainage
gas pressure
permeability
