Abstract：Meandering river reservoirs are characterized by quick lithology change on lateral,complicated reservoir space,and thin sand body. So it is difficult to accurately characterize meandering river reservoir architectures with the multi-well prediction method which is usually used in onshore oilfields with dense well pattern,because offshore oilfields always have a much larger well spacing. Due to the vertical resolution limitation of conventional 3D seismic and conventional inversion data,only thick sand bodies (larger than 10m) can be recognized and thin sand bodies cannot be identified. An accurate analysis in meandering river reservoir architecture cannot be conducted. Therefore we propose an approach to solve the problem. It is composed of 3 steps:"vertically timing,lateral boundary identification,and shape identification with 3D information" based on sedimentary models,geostatistics inversion,and logging data analysis. This approach is applied to sand bodies R23 of the 2nd member of Minghuazhen Formation in Oilfield M,Bohai Bay. Based on well logs and seismic inversion data characteristics,R23 can be divided into 2 sedimentary units in the vertical direction,R23-1 and R23-2. In the R23-1 and R23-2 composite channels,six channels with the direction SN are respectively recognized,and moreover,a few composite bars on these channels are also identified. Our experience shows that the proposed approach is practical and efficient in the condition of large well spacing in offshore oilfields.
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