On the basis of core analysis,well logging interpretation and well test analysis, the characteristics of logging attributes of Upper Palaeozoic sandstone reservoirs are analyzed in Yanchang gas field,east of northern Shaanxi. There have two kinds of reservoirs: quartz sandstone and lithic sandstone. The reservoirs have different well logging attributes, different relations among their physical parameters and well logging interpretation models. The results show that the differential amplitude of overlap by acoustic curve and spontaneous potential curve and the differential amplitude of overlap by resistivity curves with different prospecting range can reveal the reservoir physical properties and their variation. Furthermore, the gas-bearing characteristics of reservoirs and their logging attributes are analyzed.%通过岩心分析、测井资料综合解释和试井分析等手段,研究了陕北东部气区上古生界砂岩储层测井属性特征.研究区上古生界储层存在石英砂岩与长石砂岩两种类型,对应测井属性特征及其物性参数之间的关系、测井解释模型等均存在明显差异.针对岩屑砂岩渗透率约束困难的问题,提出了应用声波-自然电位曲线重叠图幅度以及不同探测范围电阻率曲线之间的幅度关系,综合反映砂岩储层渗透率及其变化特征的方法,进而分析了储层含气性的测井属性特征.
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