Occurrence of the Main Seam of Shanxi Formation in Sanhejian Coal Mine

The Sanhejian Coal Mine, situated in the outer zone of Xuzhou-Shuzhou thrust nappe, is complicated not only in geological structure, but also in the variation of coal seam thickness. The mining layout and operation of the coal mine are greatly influenced by the uncertainty of variation in thickness of coal seams. Based on analyzing the data collected in geological exploration and mining activity, the variation of coal seam thickness is discussed in detail, and the correlation marks for coal seams are as-certained, which are of vital significance for coal-mining operation.

三河尖关闭煤矿煤层CO_(2)封存潜力研究

关闭煤矿煤层CO_(2)地质封存是CO_(2)封存的重要方式之一,也是短期内实现碳减排指标的有效手段之一。以江苏省徐州市三河尖关闭煤矿为例,分析了已采7号煤和9号煤的煤岩煤质特征,统计了剩余煤炭资源储量,运用模糊综合评价法,选取了稳定系数、上覆岩层性质、地质构造复杂程度、地下水指标、封存煤层压温比、封存煤层深厚比、封存煤层渗透率、采空塌陷程度和其他因素等9个主要影响因素指标对7号煤和9号煤封存CO_(2)稳定性进行评价,建立关闭煤矿煤层CO_(2)封存评价方法并评估CO_(2)封存潜力。结果表明,三河尖关闭煤矿7号煤和9号煤剩余储量较大,CO_(2)封存稳定性综合评价结果分别为86.209和87.698,评价等级均为较稳定,封存潜力较高。根据建立的关闭煤矿煤层CO_(2)封存评价方法,计算获得三河尖关闭煤矿7号和9号煤层CO_(2)理论封存量分别为207.6 Mt和80.9 Mt,并据此划分封存有利区为有利区、较有利区和不利区3个等级。研究可为关闭煤矿煤层CO_(2)封存研究提供基础依据。

三河尖煤矿张庄断层防隔水煤柱留设探讨

根据三河尖煤矿水文地质及张庄断层的实际揭露情况,采用分析计算法分别对张庄断层的上下盘防隔水煤柱进行了计算,上盘煤柱按50 m留设,下盘按43. 8～75. 7 m留设,共计解放煤炭资源量96. 6万t,稳定了矿井生产接续,对类似条件的矿井具有一定的借鉴意义。