This paper discusses the principle and methods of the predetermination ofreservoir parameters between wells with three kriging methods of geostatistics,which have been applied to one oilfield. On the basis of the geological characteristics of the oilfield, using theoptimum inspection, some optimal estimation models of reservoir parametershave been established. Then, the 3-d variation rules of reservoir parameters havebeen set forth, thus opening up a new method for establishing a 3-d reservoirpredetermination model.