| Changyuan in Daqing oilfield has grown Sartu,Putaohua and Gaotaizi reservoirs, this group reservoir belongs to big scale fluvial-delta deposit in the north of Songliao Basin, the deposit thickness is about 500m, and mainly in sand-shale inter-bedding deposit. The deposit characteristics are: the number of layers is too much; the thickness of single layer is thin; interlamination,inlayer and areal heterogeneities are serious. Changyuan reservoir was put into production in 1964, which is in water flooding and polymer flooding development, and has been produced in high water-cut late stage already. To further improve oilfield development effects and enhance the ultimate recovery factor, geologic modeling techniques research on deposit reservoirs determinacy was developed. Based on the area geologic characteristics of Sartu,Putaohua and Gaotaizi reservoirs in Changyuan, this paper adopted fractal theory, difference method, wavelet conversion and neural network to give "explanations" to logs according to bare well logs principle, realized dividing deposit units limitation automatically, identifying deposit microfacies and building database to build the basis of geologic modeling techniques for reservoirs determinacy. On this basis and surveys on domestic and foreign geologic modeling techniques, this paper explored a geologic modeling technique for deposit reservoirs determinacy suit to this area, and suggested to build reservoir space data volume by using vertical non-uniform grid technique to solve the problem of vertical non-uniform value in modeling and faceis control technique to solve areal distribution differential. This model could portray reservoir heterogeneity's space changing characteristics in detail, and have got a nice effect on oilfield adjustment and potential tapping after applying this technique. These practices explored a new path to guide oilfield developments, and to improve developments level.
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