华北奥陶系顶部碳酸岩层隔水特性及分布规律  

Water-resisting characteristics and distribution rule of carbonate strata in the top of Ordovician in North China

作　　者：缪协兴[1] 白海波[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《煤炭学报》2011年第2期185-193,共9页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)项目(2007CB209400);国家自然科学基金重点项目(50634050);江苏省创新学者攀登项目(BK2008007)

摘　　要：采用地质演化历史、岩石成分、微孔隙结构分析及钻探资料统计等方法,从宏观和微观上证实了奥陶系顶部碳酸岩层的隔水特性及形成机理,提出了利用奥陶系顶部碳酸岩层的隔水性以增加隔水层的总厚度和强度的观点。奥陶系碳酸岩层在华北板块中部残留厚度大,残留层位高(新),在近南北边缘则被剥蚀的较多,残留厚度薄到无,残留层位低(老)。在奥陶系顶部残留层位以石灰岩为主或加里东期古岩溶台地、古岩溶斜坡等区域只存在厚度不等的充填型隔水层;顶部层位以白云岩为主或古岩溶盆(洼)地单元的区域隔水层由充填型和岩溶不发育型共同构成,隔水层厚度大。后期的改造导致奥陶系顶部碳酸岩隔水层的局部破坏,主要是指导水陷落柱、导水断裂、岩体接触界面、浅部露头带和层内新岩溶段,这也是防水和保水的重点部位。Presented a viewpoint that increasing the whole thickness and strength of aquifuge by taking advantage of the water-resisting characteristics of carbonate rock in the top of Ordovician,which proved by using several methods.Carbonate rock of Ordovician remaining in the middle of North China Plain is thick,whose residual position is high（new）,while getting smaller in the margin,with lower residual position（old）.Filling-type aquifuge only exist in the top of Ordovician where carbonate rock dominate,as well as in areas such as old Karst platform and old Karst slope of caledonian,while both filling-type and nondevelopment-type aquifuge,with large thickness,exist in the top of Ordovician where dolomite rock is the main composition,as well as in area of old Karst basin.Reconstruction in later period caused some damages to carbonate aquifuge in the top of Ordovician,including collapse pillar,fractures,outcrop zones in shallow part and new Karst in strata,which are also the most important parts of water protection and conservation.

关 键 词：奥陶系 碳酸岩 隔水特性 残留层位 分布规律 

分 类 号：P641.5[天文地球—地质矿产勘探]