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源-汇系统研究是当今地质学研究热点.东营凹陷南缓坡沙二段沉积时期是构造稳定的斜坡带,与其物源区广饶凸起构成完整的源-汇系统.基于岩心、测井、分析化验及三维地震资料,精细刻画研究区古地貌形态及沉积物搬运通道,明确沙二段浅水辫状河三角洲沉积特征;通过地震属性与钻井岩性标定,明确沉积体系分布及时空演化关系,探讨沉积主控因素及源-汇体系配置关系.结果表明,物源区自西向东发育i~iii三个汇水单元,及V1~V4四个古沟谷,碎屑沉积物通过古沟谷搬运输送,向滨-浅湖沉积环境的缓坡(0.52°~1.29°)沉积区供源,形成平面上河道频繁分叉改道、垂向上多个正韵律叠置、岩性以分选中等、磨圆较好的含砾砂岩为主的浅水辫状河三角洲沉积.自沙二下亚段沉积期到沙二上亚段沉积期,沉积体向前推进,规模增大,沉积体系垂向演化主要受控于古气候变化导致的湖平面升降.平面上,Ⅰ~Ⅲ沉积区内朵叶体形态及规模受控于源区汇水单元面积、垂向高差及通道形态与规模,朵叶体面积与垂向高差及汇水单元面积呈正相关.
The study of source-sink system is a hot research topic in geology today.During the sedimentary period of the second member of NanBaopo Formation in Dongying sag, it is a stable slope zone, forming a complete source-sink system with Guangrao bulge in its provenance area.Based on core, well logging and analysis Sedimentary and 3D seismic data are used to characterize the paleogeomorphology and sediment transport pathways in the study area and to clarify the sedimentary characteristics of shallow braided river delta in the second member of the Shahejie Formation. The relationship between sedimentary system distribution and temporal-spatial evolution is clarified through seismic attributes and drilling lithology calibration Sedimentary controlling factors and source-sink system configuration.The results show that there are three catchment units i ~ iii and four ancient valleys V1 ~ V4 from west to east in the provenance area, and the clastic sediments are conveyed through the ancient valleys, The sediments of gentle slope (0.52 ° ~ 1.29 °) in the shallow-lake sedimentary environment are supplied to the sedimentary area, and the channels on the formation plane are frequently diverged and diversified, with a number of positive rhythmic superimposition in the vertical direction. Of sandstone-dominated shallow braided river delta deposition.The sedimentary bodies moved forward and increased in size from the sedimentary period of the second sub-sand to the second sub-sand of the Shahejie Formation, and the vertical evolution of the sedimentary system was mainly controlled by Paleoclimate changes lead to In the plane, the morphology and size of the leaf body in Ⅰ ~ Ⅲ sedimentation area are controlled by the catchment unit area, vertical height difference, channel shape and scale, leaf area, vertical height difference and sink Water unit area was positively correlated.