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通过对旬邑地区15口井钻井资料的岩石类型、岩心特征、测井相特征等分析研究,明确长8、长6油层组的沉积相特征及储集性能。研究区的沉积相类型主要为三角洲前缘亚相,发育水下分流河道、水下天然堤、水下决口扇、分流间湾等沉积微相。长8组成藏期,湖盆整体处于缓慢沉降期,河道砂体规模中等;长6组成藏期,湖盆面积收缩,水体变浅,水下分流河道砂体向湖盆中心推进范围明显,分布面积最大。不同沉积微相的储集性能存在差异:水下分流河道砂体的储层物性最好,是主力储集砂体;水下天然堤、水下决口扇储层物性中等;分流间湾储层物性较差。研究成果为有利勘探目标优选奠定了基础。
By analyzing and analyzing the rock types, core features and logging facies characteristics of drilling data of 15 wells in Xunyi area, the sedimentary facies characteristics and reservoir properties of Chang 8 and Chang 6 oil reservoirs are clarified. The sedimentary facies of the study area mainly include the delta front facies, the development of underwater distributary channel, underwater natural dike, underwater rupture fan, shunt bay and other sedimentary microfacies. During the formation period of the Chang-8 formation, the lacustrine basin was in a slow subsidence period and the channel sandbody was of medium scale. During the long period of the 6th member formation, the area of the lakeshore shrank and the water body became shallower. The submarine distributary channel sand body promoted the center of the lake basin obviously, The largest area. Different sedimentary microfacies have different reservoir characteristics: the submarine distributary channel sandstone has the best reservoir property and is the main reservoir sandbody; the natural underwater embankment and underwater rift fan reservoir have medium physical properties; the shunt bay reservoir Poor physical properties. The research results laid the foundation for the favorable exploration target optimization.