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沾化凹陷三合村洼陷沙河街组沙三下亚段(Es3L)作为重要储集层段,勘探潜力巨大,精细刻画三合村洼陷沙三下亚段物源体系对沉积体系重建、有利区带预测具重要意义。采用古地貌宏观区分物源区与沉积区,并精细刻画西南部与南部物源通道(I~VI号),运用岩心、岩屑组成特征明确沉积区沉积相类型及原始物质成分,通过地震属性与地层切片精细描绘沉积区内“源-汇”配置及时空演化关系,从不同角度、不同层次对三合村洼陷古物源体系进行综合刻画。结果表明,洼陷西南部斜坡区(约3°)物源来自陈家庄凸起西段(I、II号沟槽输导),相对富砾,以碳酸盐岩岩屑为主;南部坡折区(约8°)物源来自于陈家庄凸起东段(III~VI号沟谷输导),相对富砂,发育单晶石英或多晶石英颗粒。平面上,沉积区扇三角洲沉积体系规模与物源通道的宽深比及延伸距离呈正相关,垂向上,低位体系域(LST)形成扇体规模远大于高位体系域(HST)扇体,且交汇区物源体系由南部向西南部迁移转化。
As an important reservoir segment, Es3L in Shahejie Formation in Sanhe Village Sag of Zhanhua sag has great potential for exploration. The Es3L sedimentary system is reconstructed by the provenance system of Es3 sub - Benefit zone prediction is of great significance. The palaeogeomorphology is used to distinguish the source and sedimentary areas macroscopically and to finely characterize the source channels (I ~ VI) in the southwest and southern China. The sedimentary facies types and components of the sedimentary facies are defined by core and debris compositional features. And the stratigraphic subdivision elaborate the relationship of “source-sink” configuration and temporal-spatial evolution in the sedimentary area, and comprehensively depict the ancient source system of Sanhe village from different angles and different levels. The results show that the source rocks in the southwestern part of the depression (about 3 °) come from the western part of the Chenjiazhuang bulge (channel I and II) and are relatively boulder with carbonate cuttings as the dominant part. The source of the area (about 8 °) comes from the eastern segment of the Chenjiazhuang convex (III / VI gulch guide), which is relatively rich in sand and develops monocrystalline quartz or polycrystalline quartz particles. In the plane, the size of fan-delta depositional system in sedimentary area is positively correlated with the aspect ratio and extension distance of the source channel, while the vertical and lower LST are larger than those of the high-level system tract (HST) Regional source system from south to southwest migration transformation.