Abstract: A novel fluvial model for reservoir sedimentary facies is presented, which is characterized by extensional description and simulation of fluvial forking and crossing phenomena. According to the features of modified fluv ial model and fluvial geology and geography,a new conditioning algorithm for the model is adopted, realizing co-Boolean simulation, in which combined with sand probability model. The case study shows that the modified fluvial model contains more abundant and practical geologic information, with which the description of the fluvial deposit is more accurate, simple and fast, including upstream, downstream and branch channel. Thus, the co-Boolean simulation could allow the sedimentary facies modeling to efctively decrease uncertainty of the reservoir modeling by integrating w ith secondary information.

Key words: fluvial deposit, reservoir, model, method