基于沉积相分布规律的含水层富水性研究

Study on water yield capacity of fractured aquifer based on sedimentary facies distribution law

为了研究浅埋深厚煤层直接顶板砂岩含水层富水性特征,在对含水层沉积特征、沉积体系、层序地层等分析的基础上,将沉积相分布规律作为影响含水层富水性主控因素之一,并根据地质、水文地质条件,进一步利用沉积相指数、风化程度指数、含水层厚度、岩心采取率等因素构建富水性评价指标体系,并利用基于GIS的层次分析法最终获得富水性评价结果。结果表明:富水性较强区域主要位于研究区的西南部,多为古河道流经的区域;富水性较弱区域主要位于研究区的东北部,表现为河漫滩沉积微相。

In order to study the water-rich characteristics of the direct roof sandstone aquifer in shallow and thick coal seam,based on the analysis of aquifer sedimentary characteristics,sedimentary system and sequence stratigraphy,the sedimentary facies distribution law was regarded as one of the main controlling factors affecting the water-rich aquifer.According to geological and hydrogeological conditions,the sedimentary facies index,weathering of index,aquifer thickness,core take-up rate and other factors were used to constructed to construct a water-rich evaluation index system,and the GIS-based analytic hierarchy process is used to finally obtain the water-rich evaluation results.The results showed that the area with high water content is mainly located in the southwest of the study area,and most of them are the areas flowing through ancient river channels.The area with weak water-rich is mainly located in the northeast of the study area,which is characterized by flood plain.