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）。

The Ningtiaota coal mine is located in the eastern edge of Ordos Basin. Yan’an Formation is the main coal-bearing strata in Jurassic in this area, and overlying strata is Zhiluo Formation, which develops many sand bodies. The thick layers of sand provide large storage spaces for groundwater. It makes an important sense for the safety of coal mining in Yan’an Formation, after research Zhiluo Formation sandstone aquifer characteristics and rich water situation. This article is based on fully collecting field outcrops, drilling and logging information, using the theory and method of sedimentology and sequence stratigraphy to analyze sedimentary characteristics of Zhiluo Formation in the Ningtiaota coal mine and has divided the sedimentary system and identified the sedimentary facies in the study area, analyzed the Zhiluo Formation by the sequence stratigraphy, established the sequence stratus frame, and has studied the sand body spreading regularity in this sequence stratus frame. The conclusion contains the follows: 1. The vertical sedimentary sequence for Zhiluo Formation in the research area can be divided into braided river sedimentary system, braided river delta sedimentary system, meandering river sedimentary system and shore shallow lacustrine sedimentary system in ascending order. This paper has identified the sedimentary facies, subfacies and microfacies in the study area. 2. Based on the principle and methods for base level cycle of the high-resolution sequence stratigraphy, the Zhiluo Formation in the study area is divided into a II level sequence(SLSC1), three III level sequences and ten IV level sequences, respectively corresponding to a super long-term base-level cyclic sequence (SLSC1)，three long-term base-level cyclic sequences (LSCl-LSC3) and ten mid-term base-level cyclic sequences(MSC 1-MSC 10), and has established the sequence stratus frame. 3. Based on the division of sedimentary system and identify the sedimentary facies to research the Zhiluo Formation’s sedimentary facies distribution in the study area. We consider the study area experienced a braided river- braided river delta- meandering river and shore shallow lacustrine of evolution, and marginal decline and uplift of tectonic cycle. In the other way, the researchers found that the east of Ordos Basin roughly showing west to east, north to south, and the sediment sources of Zhiluo Formation comes mainly from the western and northwestern edge on the higher topography. 4. Furthermore, the sedimentary facies are distributed in north-south direction, mainly including sandy river skeleton, sand dam and silty sand-shale river alluvial flat, and the thick sand layers, formed by the sandy river and sand dam, provide good conditions for groundwater reservoir and development. The sandstone of this area is relatively strong water-richness. 5. On the basis of hydrogeological data, comprehensive analysis that there are some inherent relationship between sedimentary facies and stratigraphic’s water-richness in Zhiluo Formation; and the study area is divided into three different water-richness zones (strong, medium and weak).