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从斜坡带沉积背景和古地貌特征入手,以高分辨率层序地层格架为单元,采用3D地震、测录井、取心、砂体分布与油气藏特征等资料综合分析的方法,探讨了渤海湾盆地歧口凹陷歧北斜坡沙三段坡折体系特征与砂体分布以及油气藏之间的关系。结果表明,歧北斜坡沙三段受差异沉降、断块翘倾与基底构造影响,总体发育三级坡坪带,在斜坡高部位一级坡坪带的凸起近缘发育侵蚀坡折带,斜坡中低部位发育挠曲坡折带,构成了沙三段低位期侵蚀-挠曲坡折体系。在斜坡区沙三期,盆内物源供砂,沟槽输砂,坡坪控砂,源型聚砂,纵向上可识别出低位、湖扩、高位3个三级旋回与7个四级高分辨率旋回,各层顺斜向上超覆分布,在各级坡坪带发育了辫状河三角洲前缘、远岸水下扇与滨浅湖砂质滩坝等砂体,地层岩性圈闭发育。这些地层岩性圈闭与烃源区近邻,优势输导,富集成藏,叠合连片,是斜坡区地层岩性油气藏勘探的重要对象之一。
Based on the sedimentary background and palaeogeomorphology of the slope belt, the high-resolution sequence stratigraphy framework is taken as a unit. Based on the comprehensive analysis of 3D seismic data, well logging, coring, sand body distribution and reservoir characteristics, Characteristics of Slope Break System and Distribution of Sandbody and Relationships between Reservoirs in Qikou Depression, Qikou Depression, Bohai Bay Basin. The results show that the third member of the third section of Qifbei slope is affected by differential settlement, fault block tilt and basement structure, and generally develops three-level slope plateau. The erosion near the convex edge of the first- The middle and lower parts of the slope developed flexural slope break, which formed the low-stage erosion-deflection slope-break system of Es3. In the third stage of the Shahejie Formation, the sand source in the basin is supplied with sand, the sand is transported by the groove, the sand is controlled by the slope, and the source sand is vertical. Three low-lying, High-resolution cycles, the strata of the strata are overtaxed and overtopped, and the braided river delta front, the submarine fan at the far shore and the sandy beach bank of the shore-shallow lake are developed at each level of the slope, Closed development. These stratigraphic lithologic traps are adjacent to hydrocarbon source areas, and have advantages in guiding and enrichment of reservoirs and superimposition of contiguous strata. It is one of the important targets for lithologic reservoirs exploration in slope areas.