皖北海孜矿10煤顶底板砂岩水化学特征及成因  

Study on Hydrochemical Characteristics and Genesis of Sandstone Between the Top and Bottom of the 10 Coal Seam in Haizi Mine in Northern Anhui Province

作　　者：张俊 姚多喜[1] 蒋正[1] ZHANG Jun;YAO Duo-xi;JIANG Zheng(School of Earth Science and environment,Anhui University of Science and Technology,Huainan Anhui 232001,China;Hohai University,Wentian College,Ma＇anshan Anhui 243031,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]河海大学文天学院,安徽马鞍山243031

出　　处：《安徽理工大学学报（自然科学版）》2018年第4期6-13,共8页Journal of Anhui University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(51474008);河海大学文天学院校级科研项目(WT16006;WT17012)

摘　　要：二叠系主采煤层顶底板砂岩裂隙含水层,是矿井直接充水含水层。以皖北矿区海孜矿10煤层顶底板砂岩含水层为研究对象,通过对其地质特征的研究和17个水样品(8个底板砂岩水、7个顶板砂岩水)的常规水化学组成进行分析,利用主成分分析并结合水-岩相互作用关系来探讨其特征差异及成因。结果表明:海孜矿10煤层底板岩性为浅灰色细砂岩与深灰色灰黑色泥岩、粉砂岩互层,顶板为浅灰色中细粒长石石英砂岩;顶底板砂岩水的离子含量差异明显,底板煤系砂岩水化学类型主要为Ca-Mg-SO4,其次有HCO3-Cl、HCO3-Cl-SO4;顶板煤系砂岩水化学类型主要为HCO3-Cl,其次有SO4-HCO3-Cl;与第四含水层、太原组灰岩水、老塘水相比,10煤层底板含水层中Ca2+、Mg2+、SO2-4与顶板含水层中Cl-、HCO-3所占比例区分明显。主成分分析结果表明10煤底板受到"脱硫酸"作用、硅酸盐矿物的溶解及于地下水径流作用有关,顶板则主要是钠盐矿物(如芒硝)、苦盐矿物(如苦盐)、硅酸矿物以及石膏的溶解所致。The fractured aquifer of the top and bottom of the main coal mining in Permian is the direct water-filled aquifer of a mine. In this paper, the geological characteristics and conventional water chemistry of 17 water samples （8 samples of bottom sandstone water and 7 samples of top sandstone water） of the coal seam of Haizi coal mine in northern Anhui mining area were analyzed. Factor analysis and cluster analysis were used to study the cause of formation and the interaction between water and rock. The results show that the Haizi coal mine 10 coal seam floor lithology is composed of grayish fine sandstone and dark gray, black mudstone, siltstone, roof lithology was composed of grayish fine grained feldspar quartz sandstone. The ion content of sandstone in the top and bottom plate was obviously different, with The bottom coal sandstone water chemistry type being Ca-Mg-SO 4, followed by HCO 3-Cl and HCO 3-Cl-SO 4, and roof coal sandstone water chemistry type being HCO 3-Cl, followed by SO 4-HCO 3-Cl. Compared with the fourth aquifer, Taiyuan group limestone water, goaf water, the proportion of Ca 2＋ , Mg 2＋ and SO 2- 4 in the aquifer of the floor of coal seam was significantly different from that of Cl - and HCO - 3 in the roof aquifer. Factor analysis shows that the bottom of 10 coal seam aquifer was related with “removing sulfate” effecy, silicate mineral dissolution and impact of groundwater runoff, however, the roof aquifer was mainly related with the dissolution of minerals, for example, salt minerals （such as Glauber＇s salt）, bitter salt minerals （such as salt）, silicate minerals and the dissolution of gypsum.

关 键 词：煤系砂岩 含水层 常规水化学 10煤层 海孜煤矿 

分 类 号：P641.3[天文地球—地质矿产勘探]