Abstract: In order to propose effective stimulation measures,it is necessary to find a new method to depict the sand reservoir structure of complex meander belt and study the geological factors of uneven efficiency of horizontal water injection in production well group in offshore oilfield. This paper took the oil-bearing sand body NmⅢ2 of Q oilfield in Bohai for example to introduce a new reservoir architecture method. First,nine different cutting relations between every two rivers were concluded by classical meandering stream and the result of micro-facies correlation among the wells. Through combined seismic record obtained from seismic forward modeling,we found that different cutting relations make different seismic wave features. Second,the different intensity of cutting results in the different strength of seismic response. So,we tried to use a single amplitude attribute and dual seismic attribute fusion technology to locate all these different cutting relations accurately. Last,on the basis of the works above, combined with the restoring ancient landscape,the prediction of sand body thickness and configurational formula, precise recognition of architecture interfaces of complex meander belt deposition would be realized. The results show that the meander belt sand bodies were divided into several different connective or semi-connective bodies by the architecture interfaces. It is recognized that the permeability of the different cutting relations is different. The research results can provide reliable geologic accordance for optimizing injection-production structure.

Key words: characterization of single sand body, internal configuration, forward modeling, attribute fusion technology, paleogeomorphological analysis, architecture interfaces