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鄂尔多斯盆地北部经过多年的勘探与研究，已发现丰富的油气资源，在勘探上取得了较大突破，发现了大牛地大型气田。但大牛地上古生界砂岩气藏致密低渗，进行加砂压裂投产必不可少。依据对气藏51次井（层）的压后测试资料分析，表明盒3段压后无阻流量较高，盒2段次之，向下逐渐减小，整体呈现出高产井主要集中分布在上部盒2～3段的特点。综合分析储层沉积微相、岩石学特征、物性、含气性、压裂施工参数、压裂施工工艺以及压裂造缝情况，认为储层质量优及其含气丰度高是该区气藏压后获得巨大产能的基础，人工压裂缝造缝半长在50 m以上是压后获得高产的关键。文章分析方法对同类型气藏的科学开发具有一定的指导和借鉴意义。

POSTFRACTURE RESPONSE ANALYSIS OF UPPER PALEOZOIC GAS RESERVOIR IN DANIUDI FIELD IN E’ERDUOSI BASIN

In North E’erduosi Basin,the exploration and investigation have been carried out for many years,the abundant hydrocarbon resources being found out,a relatively great breakthrough being made in gas exploration and the Daniudi large sized gas field being discovered.The Upper Paleozoic gas reservoir in the field is compact and its permeability is low,it is necessary to carry out sand fracturing before its being put into production.According to the postfracture test data analysis of 51 well (layer) times in the gas reservoir,it was shown that the postfracture open flow capacity of P1sh3 (the third member of Shihezi Formation,Low Permian) was relatively high,then P1sh2 and then the lower zones in the bottom;and,on the whole,the high yield wells were mainly drilled in the top P1sh2-3/Through analyzing comprehensively reservoir sedimentary microfacies,petrological characteristics,petrophysical properties,gas potential,fracturing parameters and techniques,and artificial fracture distribution,etc.,it was thought that the good quality and high gas abundance of the reservoir are the basis of obtaining great productivity after being fractured and the artificial fracture hemi length of over 50 m is the key of getting high yield well in this area.The analysis method in the paper is correct,which is of a certain guiding and referable significance for exploiting scientifically the same gas reservoirs.