Abstract：Based on the understanding of the fault breakpoint ownership of complex fault blocks and on previous studies results,a research of fault breakpoint assemblage types of sand-mud inter-beds in Saertu Oilfield,Daqing is carried out.The fault breakpoint assemblage types with throw of less than 5m in sand-mud inter-beds are summarized from the aspects of fault combination,fault binary structure,fault vertical segmental growth,and seismic fault terminal portion.The following observations are obtained:①There are four types of fault breakpoint assemblage,such as fault intersection,single fault fracture zone,fault vertical segment,and the seismic fault terminal portion.The corresponding representation of theses breakpoint assemblages in space,plane,and section is established; ②Breakpoints of fault intersection are mainly classified by seismic fault identification,their throws vary greatly,and the breakpoint vertical distance is less than 40m.Fault breakponts with small throws belong to fault fracture zones.For releasing vertical segmental breakpoints,throws are almost equal,and there are plastic layers among breakpoints.For restraining vertical segmental fault breakpoints,there are plastic layers with a larger thickness,in which Faults experienced multi-stages.Terminal portion breakpoint of seismic fault is located in the direction of fault extension and accords with the law of fault throw-distance curve; ③Based on this research,52 breakpoints with throws from 5m to 10m are identified,the overall breakpoint assemblage ratio reaches 93.3%.The breakpoint assemblage ratio with throws smaller less than 5m is 81.8%.It provides accurate and useful data for of fault characteristics analysis,fault model building,and remaining oil development.
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