Abstract：Based on the existing hierarchical scheme of architectural units in clastic deposits,taking account of the evolution law of natural river sedimentation,the data base and economic development scale of offshore oil fields,and following the principle and basis of the geological bodies classification,an architecture hierarchy of fluvial compound sand-body in offshore oil field is established. In this paper,the basic characteristics of 13g rade architecture units of fluvial compound sand-body are systematically described from the aspects of geological genesis,main control factors,space-time scale,etc.,and the correlation between them and related sedimentary geological body grades is analyzed. The difference between the fluvial compound sand-body architecture hierarchy and the existing classification of reservoir architecture mainly lies in the adding of “composite point bar”,which is a composite sedimentary unit composed of multi-stage residual point bar. Composite point bar is the connecting point of reservoir architecture theory,offshore oil field data resolution and offshore oil field economic development scale. It is a good practice of “seismic guidance,well-seismic combination” research ideas in offshore oil field. It has been proved that the architecture hierarchy of fluvial compound sand-body has certain advantages for guiding offshore oil and gas development.
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