对山西保德扒楼沟剖面二叠系曲流河砂体进行实测、精细解剖和岩相分析,建立不同类型河道砂体的构型模式,定量表征其内部沉积非均质性,预测不同类型河道砂体的剩余油聚集区。基于露头的岩性、粒度、沉积构造和颜色等特征,在扒楼沟二叠系曲流河砂体中识别出8种岩相类型,通过对砂体进行精细解剖与岩相分析,将河道下部槽状交错层理砂体从传统定义的边滩砂体中划分出来称为“底滩”,而将河道上部板状层理砂体称为“边滩”。在精细刻画河道内底滩与边滩砂体沉积特征及叠置关系的基础上,识别出侧向迁移型、串沟截直型、颈项截直型及废弃河道型4种河道砂体。结合不同类型河道砂体构型与非均质性特征,认为侧向迁移型河道砂体非均质性较弱,剩余油分布较少;串沟截直型与废弃河道型河道砂体非均质性较强,剩余油相对富集;颈项截直型河道砂体非均质性最强,剩余油最为富集。图6表3参14
Through actual measurement, careful sand body anatomy and lithofacies analysis of the meandering river sand bodies in the Permian of the Palougou profile in Baode county, Shanxi province, the architectural models of different kinds of meandering river sand bodies are established to characterize their interior sedimentary heterogeneity quantitatively, and predict the remaining oil areas in different kinds of meandering river sand bodies. Based on the outcrop characteristics, such as lithology, grain size, sedimentary structure, color, and so on, eight kinds of lithofacies are identified. By careful anatomy and lithofacies analysis of sand bodies, the bottom trough cross bedding sand body was separated from the classical point bar and named “bottom bar”, and the upper planar cross bedding was named “marginal bar”. Based on fine description of the sedimentary characteristics and superimposed relationships of bottom bar and marginal bar, four kinds of channel sand bodies, namely, lateral migration channel type, chute cutoff channel type, neck cutoff channel type and abandoned channel type, were identified. According to the architecture and heterogeneity characteristics of different types of channel sand bodies, it is concluded the lateral migration channel sand body has weak heterogeneity and little remaining oil, the chute cutoff and abandoned channel sand bodies with a little stronger heterogeneity is richer in remaining oil, and the neck cutoff channel sand body with the strongest heterogeneity has the most abundant remaining oil.
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