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基于包日温都构造带九佛堂组储层砂体分布认识不清、分层混乱、开发效果不理想的现状,利用高分辨率层序地层理论,综合地震和钻测井资料,对九佛堂组进行了层序基准面旋回结构分析,识别不同级次旋回基准面特征,划分出1个长期、4个中期和10个短期旋回层序,以及2类5种基准面旋回结构类型。提出了九佛堂组为水下冲积扇沉积体系,明确了储层发育及分布规律,储层砂体分布与扇中辫状沟道发育密切相关。建立了不同级别基准面旋回层序结构式样,有利储层发育在基准面上升型向上变深的旋回层序早期和复合型下降半旋回层序晚期,前者主要为辫状沟道沉积所形成厚度大、连通性好的储集砂体,为本区主要储层,后者为辫状沟道边部砂体及辫状沟道间薄层砂,为本区较有利储层。
Based on the current situation that the distribution of sand bodies in the Jiufotang Formation with unclear understanding, stratification and development is unsatisfactory, based on the data of high resolution sequence stratigraphy, synthetic earthquakes and drilling and logging data, The philosopher group analyzed the cycle structure of sequence datum plane, identified the characteristics of different level cycles, and divided into 1 long-term, 4 medium-term and 10 short-term cycles and 2 types of 5 types of datum cycles. It is proposed that the Jiufotang Formation is a sedimentary system of underwater alluvial fan, which defines the development and distribution of reservoirs. The distribution of reservoir sand bodies is closely related to the development of fan-shaped braided channels. The results show that the reservoirs developed at the early stage of the upward cycle of the uplift of the datum and the late stage of the composite descending half-cycle sequence. The former is mainly formed by the thickness of the braided channel deposition Large, well-connected reservoirs are the main reservoirs in this area, while the latter are braided channel edge sand body and braided channel thin sand, which is the favorable reservoir in this area.