鄂尔多斯盆地白垩系含水层系统分析  

The groundwater system analysis of Cretaceous system of Ordos basin

作　　者：李云峰 冯建国[1] 王玮[1] 李金荣[1] 王疆霞[1] 徐中华[1] 李英[2] 

机构地区：[1]长安大学,陕西西安710054 [2]西安地质矿产研究所,陕西西安710054

出　　处：《西北地质》2004年第2期90-96,共7页Northwestern Geology

基　　金：中国地质调查局地质调查项目"鄂尔多斯盆地地下水勘查"(项目编号01002233)

摘　　要：从地下水含水层系统的角度对鄂尔多斯盆地白垩系地下水系统进行了划分和分析。由于下白垩系统保安群为一套陆相碎屑岩建造,岩性复杂,由砂岩、粉砂岩和泥岩组成的频繁交替、重复叠置的多层层状结构,决定了鄂尔多斯白垩系自流水盆地是多层结构的地下水系统。这种重复叠置的多层层状地质结构,决定了地下水含水层系统的多层性、承压性及层与层之间的相对封闭性。根据沉积旋回和含水介质的性质,在全盆地范围内把白垩系地下水系统从上向下划分为:罗汉洞含水岩组、环河含水岩组和洛河含水岩组。通过对这3大含水岩组分别进行了分析认为,洛河含水岩组和环河含水岩组分布范围广、含水层厚度大、天然资源丰富,是盆地区具供水意义的主要含水岩组。罗汉洞含水岩组因分布面积小,含水层厚度差异大、水质变化大,除陇东地区外,大部分地区供水价值较小。Groundwater system of Cretaceous system of Ordos basin in terms of system of water-bearing stratum of groundwater was divided and analysesed.Because Bao'an group of lower Cretaceous system is formed of clastic rock of a set of land facies,which rock is complicated,made up of sandstone,flour sand rock and mud stone.And these stratum frequently replace,repeat a pile of multilevel layer of forms structure put, determine Cretaceous system of Ordos basin which groundwater flow automatically is multilevel groundwater system of structure.And It determines the groundwater system is multilevel stratum,confined and relatively close between stratum and stratum.According to depositing gyration and quality of aquifer material,the Cretaceous system groundwater system is divided into Luohandong aquiferous group,Huanhe aquiferous group and Luohe aquiferous group from up to low within the range of the whole basin.The author has analyzed the three aquiferous groups separately.Based on above these,Huanhe aquiferous group and Luohe aquiferous group,which distribute range wide,aquifer stratum thickly,natural resource abundantly,are the main aquiferous stratums to supply water of the meaning.Luohandong aquiferous group distributeas limited,thickness widely different,water quality changing heavily,besides east area of Gansu Province,value of supply water is relatively little in most areas.

关 键 词：鄂尔多斯盆地 白垩系地下水 含水层系统 

分 类 号：P534.53[天文地球—古生物学与地层学] P641.7[天文地球—地质学]