霍西煤田义棠矿太原组灰岩储层宏观孔隙度研究

Study on Macroscopic Porosity of Taiyuan Formation Limestone Reservoir of Yitang Coal Mine in Huoxi Coalfield

为了评价霍西煤田义棠矿9~#、8~#、7~#煤层上覆K_2、K_3、K_43层灰岩中瓦斯资源,解释灰岩瓦斯大量涌出的现象,并保障后续瓦斯资源的开采,通过野外地质环境调查及矿井井下观测,并结合本区灰岩岩心采取率和钻井漏失量资料分析,最终采用以3层灰岩钻井漏失量的比值关系约束由岩心采取率所得各层灰岩孔隙度的方法,估算得K_2、K_3、K_43层灰岩宏观孔隙度分别为20.10%、14.81%、10.58%。研究成果解释了义棠矿煤系灰岩储层中瓦斯大量涌出的现象。

In order to evaluate the gas resources of K2, K3 and K4 limestone in 9^#, 8^# and 7^# coal seams of Yitang Coal Mine in Huoxi coal field, explain the large gas emission in the limestone reservoirs, ensure the subsequent exploitation of gas resources,through the survey of field geological environment and underground mine observations, as well as the data analysis of core recovery and drilling leakage, finally, we adopt the method of using the ratio of drilling leakage of three-layer limestone to limit the porosity which is calculated from core recovery. The macroscopic porosity of K2, K3 and K4 limestone is estimated to be 20.10% ,14.81% and 10.58% . The results provide the explanation for large gas emission in the limestone reservoirs of Yitang Coal Mine.