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以钻井、测井资料的综合研究为基础,详细研究了鄂尔多斯盆地胡尖山姬塬地区三叠系延长组长6油层组短期基准面旋回层序特征,将短期旋回层可划分3种基本结构类型,再根据可容纳空间大小和上下两个半旋回的厚度进一步划分为7个亚类型。不同类型的短期旋回在三角洲前缘、湖泊两类沉积体系及相应的微相类型中具有不同的基准面旋回结构和叠加样式,并总结了短期基准面旋回层序的变化规律和分布模式。在此基础上,探讨了不同结构类型和充填样式的短期旋回层序的沉积序列对储层的控制作用,指出最有利储集砂体发育的短期旋回类型。
Based on the comprehensive study of drilling and well logging data, the short-term basaltic cycle characteristics of Chang 6 oil layer of Triassic Yanchang Formation in Jiyuan area, Hujian Mountain, Ordos Basin are studied in detail. The short-term cyclotron can be divided into three basic types , And then further divided into seven subtypes according to the size of the accommodating space and the thicknesses of two semi-cycles up and down. Different types of short-term cycles have different datum cycle structure and superimposition pattern in the delta front and lacustrine sedimentary systems and corresponding microfacies types, and summarize the variation regularities and distribution patterns of short-term basement cycle sequences. On this basis, we discuss the control effect of sedimentary sequences of short-term cycle sequences of different structural types and filling patterns on reservoirs and indicate the short-term cycle types of the most favorable reservoir sand bodies.