Abstract：3-D Cokringing method is used to combine seismic data with borehole data，thus improving reservoir parameter interpolation. 3-D Cokringing method is suitable to reservoir parameter modeling that is far from borehole area. The joint use of seismic characteristic data and borehole data brings satisfactory reservoir parameter interpolation results which are better than those derived only from borehole data，hence achieving reasonable combination of wide and densely-sampled seismic characteristic data with borehole data. The dimension of seismic characteristic data is reduced by analysing dominant seismic content in selecting seismic characteristics，and the use of averaged borehole parameter is avoided by deriving the samplingpoint covariants from dominant content subsidence method，thus improving the accuracy of parameter modeling. The method also serves as a new way to combine seismic data with borehole data. The check result of real data taken from south Chengdao area in Shengli Oilfield proves the method very effective.
