Taking Xiashihezi Formation in the Daniudi gas field as the research object and using the data of the drilling cores,logging,properties and productive capacity,etc.,this paper studies the relationship between different lithofacies-logging facies and reservoir sandbody properties and productive capacity in detail.The results show that the reservoir sandbody containing pebbly coarsegrained sandstone lithofacies whose gamma well log is box shape has the best physical property and the highest productive capacity,that the reservoir sandbody containing coarse-grained sandstone and medium-grained sandstone facies whose gamma well log is bell shape or dentation box shape has better physical property and middle productive capacity,and that the reservoir sandbody containing finegrained sandstone facies whose gamma well log is funnel shape has poor physical property and low productivity.Based on the statistical analysis of the superior lithofacies-logging facies,of more than 700 wells in study area and according to the plane distribution characteristics of the sedimentary microfacies and the sandbody,taking the He 3-1 small layer for example,the authors make the lithofacies-logging facies plane distribution map of the He 3-1 small layer,and depict the plane distribution characteristics of the superior lithofacies-logging facies of the He 3-1 small layer.The plane distribution map reflects the distribution rule of the physical property and production ability and also highlights the plane distribution of the gas reservoir sandbody.The achievements provide the forecast basis for appraising the traps of lithology.%以鄂尔多斯盆地大牛地气田上古生界下石盒子组为研究对象,利用钻井岩心、测井、物性和产能等资料,研究不同岩相-测井相与储集砂体物性及产能的关系,结果表明:(含砾)粗粒砂岩相(箱形)储集砂体物性最好,产能最高;其次为粗粒砂岩相-中粒砂岩相(伽马测井曲线为钟形或齿状箱形)储集砂体物性较好,产能中等;细粒砂岩相(漏斗形)储集砂体物性差,产能低.在对研究区内700余口单井优势岩相-测井相统计分析的基础上,以沉积微相和砂体平面分布特征为基础,以盒3-1小层为例编制岩相-测井相平面分布图,精细刻画金3-1小层优势岩相-测井相的平面分布特征;结合岩相-测井相与储集砂体物性和产能的相关性,得到了盒3-1小层储集砂体在平面上不同位置物性、含气性的差异,为岩性圈闭的评价提供预测依据.
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