1.College of Geology and Environment,Xi’an University of Science and Technology,Xi’an ,China； 2.No.185 Exploration Team，Shaanxi Bureau of Coal Geological Exploration，Yulin ，China

为评价陕北侏罗纪煤田顶板直罗组砂岩含水层富水性问题，综合分析了砂岩裂隙含水层富水性的影响因素，通过筛选并确定了含水层等效厚度、砂泥比、岩心采取率、砂泥岩交互层数等4个独立评价指标，构建了基于富水性结构指数法的含水层富水性评价方法。以金鸡滩井田为例，采用富水性结构指数方法评价了直罗组砂岩裂隙含水层的富水性。研究表明，以孔隙度、渗透性及粒度构造的富水性结构指数消除了各个影响因素之间的关联性，能够反映砂岩含水层富水性；利用砂岩等效厚度，将不同粒度砂岩统一转化为粗砂岩作为评价砂岩含水层富水性的指标；结合抽水试验获得的水文地质参数与富水性分区图进行对比，以G值为0.15作为直罗组含水层富水弱区与富水较强区的分界值，富水性弱区主要分布在西南部和东北部，验证了富水性结构指数法为陕北侏罗纪煤田覆岩富水性评价提供了一种有效预测途径。

In order to evaluation the Zhiluo formation sandstone aquifer water abundance of Jurassic coalfield in northern Shanxi province,the water abundance influential factors were analyzed; Ultimately,the equivalent thickness of aquifer,sand-mudstone ratio,core recovery percentage and the number of sand-mudstone alternating layer were determined as four independent evaluation index,a method of sandstone aquifer water abundance evaluation based on watery structure index was built.This method was applied to the Jinjitan coalmine,its water abundance evaluation of sandstone fractured aquifer of Zhiluo formation was done,and the results showed that this method which constituted by he porosity,permeability and grain size of the sandstone aquifer can well eliminate the correlation among the influencing factors and reflect the Zhiluo formation sandstone fractured aquifer water abundance; Using the G value as the partition threshold,if G value is less than 0.15,the corresponding area is zoned as weak rich water area which are mainly distributed in the southwest and northeast if the Jinjitan coalfield,otherwise,is zoned as strong water abundant area.finally the water abundance partition map was made,it was compared with the obtained hydrogeological parameters of pumping test,the evaluation results is in line with reality，and the watery structure index evaluation method provides an effective way for the Zhiluo formation sandstone aquifer water abundance of Jurassic coalfield in northern Shanxi province.