Abstract: In the present conditions of computer resources, the digitization of every link of fine reservoir description has been realized. Application of high-precision 3-D geology modeling greatly improves the speed and accuracy of oil-gas reservoir research. 3-D reservoir model provides supports for reservoir numerical simulation and for reservoir evaluation and design of development plan. In Karamay Fengcheng oilfield, the reservoir modeling in some new prospecting districts often appear in such a situation as large area and less well like bull's eye due to a few wells. In order to improve the simulation precision in this oilfield, the adjacent dense well patterns in the old districts are applied to determine variogram which is then used for modeling of sparse well-pattern area, and good effect of modeling has been achieved.

Key words: Karamay, Fengcheng oilfield, reservoir modeling, sedimentary microfacies, variogram