柠条塔井田直罗组沉积相与富水性关系的研究

发布时间：2018-03-14 21:38

本文选题：沉积体系　切入点：沉积相　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：柠条塔井田位于鄂尔多斯盆地的东北部边缘地带,延安组是主要含煤地层,其上覆的直罗组地层中砂体沉积较厚,给地下水的发育提供了较好的存储空间,是影响煤层开采的主要含水层。因此,分析直罗组砂体的展布对研究地下水的储存与运移具有重要意义,对于矿井防治水具有重要的指导作用。本文根据层序地层学与沉积学的理论和方法,在充分收集已有地质资料的基础上,对柠条塔井田直罗组地层的沉积体系、沉积相与层序地层格架进行了全面系统的分析;探讨了直罗组不同沉积相的空间展布特征;结合抽水试验取得的水文地质资料,探讨了直罗组砂岩含水层的富水规律,形成以下认识:1.根据沉积序列将区内直罗组地层从下到上依次划分为辫状河沉积相-辫状河三角洲沉积相-曲流河沉积相和滨浅湖沉积相;并分别进行了亚相与微相分析。2.根据高分辨率层序地层学理论,通过基准面旋回,把直罗组地层分割成1个II级层序,3个III级层序以及10个IV级层序,依次对应的是1个超长期基准面旋回(SLSC1),3个长期基准面旋回(LSC1-LSC3)以及10个中期基准面旋回(MSC1-MSC10)。3.依据直罗组沉积相的空间分布情况,分析认为该区经过了辫状河-辫状河三角洲-曲流河及滨浅湖沉积的过程。在直罗组形成阶段,研究区地形表现为西高东低、北高南低的形态,沉积碎屑物一般来自西北侧及西侧。4.直罗组沉积相以砂坝和粉砂-泥质河漫、砂质河道骨架为主,表现为南北向分布;其中,能够为地下水提供较好储存空间的主要是砂质河道及砂坝发育的厚度较大的砂岩层,此地段的砂岩富水性相对较强。5.综合分析认为直罗组沉积相与地层的富水性之间存在一定的内在联系;并根据砂体的展布规律将研究区划分为富水性不同的三个区(强、中等和弱)。
[Abstract]:The Caragana tower mine field is located in the northeastern margin of Ordos basin. Yan'an formation is the main coal-bearing formation, and the sand body is thicker in the overlying formation of Zhiluo formation, which provides a good storage space for the development of groundwater. Therefore, it is of great significance to analyze the distribution of sand bodies in Zhiluo formation in order to study the storage and migration of groundwater. According to the theories and methods of sequence stratigraphy and sedimentology, the sedimentary system of the Zhiluo formation in Caragana Tower is studied on the basis of fully collecting the existing geological data. The sedimentary facies and sequence stratigraphic framework are analyzed systematically, the spatial distribution characteristics of different sedimentary facies in Zhiluo formation are discussed, and the water-rich law of sandstone aquifer of Zhiluo formation is discussed in combination with hydrogeological data obtained from pumping test. According to the sedimentary sequence, Zhiluo formation can be divided into braided river sedimentary facies, braided river delta sedimentary facies, meandering river sedimentary facies and shore-shallow lacustrine sedimentary facies. According to the theory of high-resolution sequence stratigraphy, the stratigraphy of Zhiluo formation is divided into 1 order II sequence, 3 III sequence and 10 order IV sequence through base-level cycle. SLSC1, LSC1-LSC3) and MSC1-MSC100.3.According to the spatial distribution of sedimentary facies in Zhiluo formation, SLSC1, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, LSC1-LSC3, and MSC1-MSC100.3. It is considered that the study area has undergone the deposition process of braided river, braided river delta, meandering river and shallow littoral lake. During the forming stage of Zhiluo formation, the topography of the study area was characterized by the west high east low, the north high south low, the north high and the south low. The sedimentary clastic materials generally come from the northwest and the western side. 4. The sedimentary facies of Zhiluo formation are sandbar and silty muddy river overflowing, the framework of sandy channel is dominant, and it is distributed in the north and south direction, among them, the sedimentary facies of the Zhiluo formation are characterized by sand dam and silty muddy river. The sandstones that can provide better storage space for groundwater are mainly sand channels and sand dams with relatively thick sandstone beds. The sandstone in this area is relatively rich in water. 5. The comprehensive analysis shows that there is a certain internal relation between the sedimentary facies of Zhiluo formation and the water enrichment of formation, and according to the distribution rule of sand body, the study area is divided into three regions with different water enrichment. Medium and weak.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P641.4

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