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通过岩心描述和分析，并结合砂体分布形态，确认安塞油田王窑区长６油层为湖泊三角洲沉积体系，储集砂体为三角洲前缘相带的各种砂坝和分流河道，在单井微相分析的基础上，对该区的砂体微相进行了分析．通过铸体薄片、扫描电镜、Ｘ－射线衍射和电子探针等多项分析手段，对长６油层的储层特征进行了分析，该区储层岩性为细粒长石砂岩，主要自生矿物类型为方解石、绿泥石、浊沸石、伊利石、石英、长石和少量伊一蒙混层．储层面孔率一般５％～８％，主要为粒间孔隙、骨架颗粒溶孔、浊沸石溶孔和少量裂缝孔隙．部分微裂缝在地下处于开启状态．在成岩特征研究的基础上，建立了长６油层成岩演化序列．油砂体研究结果表明，油藏分布和聚油面积受三角洲沉积作用控制，储层性质受砂体微相和成岩作用的双重控制
Based on the core description and analysis and the distribution of sand bodies, it is confirmed that Chang 6 reservoir of Wangyao area in Ansai Oilfield is a sedimentary system of lacustrine delta, and the reservoir sand bodies are various sand bars and distributary channels of delta front facies. Based on well and microfacies analysis, the sand body microfacies in this area were analyzed. The characteristics of reservoirs in Chang 6 reservoir were analyzed by cast thin slices, scanning electron microscopy, X-ray diffraction and electron probe. The reservoir lithology in this area is fine-grained feldspar sandstone, and the major authigenic minerals Types of calcite, chlorite, laumontite, illite, quartz, feldspar and a small amount of Yi mixed layer. The porosity of the reservoir is generally 5% ~ 8%, mainly for intergranular pores, framework particles dissolved pores, laky zeolite dissolved pores and a small amount of cracks pores. Part of the micro-cracks in the open underground. Based on the study of diagenetic characteristics, the diagenetic evolution sequence of Chang 6 reservoir has been established. The results of oil sands study show that the reservoir distribution and oil gathering area are controlled by the delta sedimentation, and the reservoir properties are controlled by the dual control of sand body microfacies and diagenesis