Abstract: In the late stage of an oil field development, the oil-water interwell connectivity presents dynamic variations with the change of development conditions. This paper proposes the oil-water well production performance-based inversion method for reservoir connectivity using multivariate linear regression. Field application in J_2x4 reservoir of Wellblock Lu-9 in Junggar basin indicates that the interwell connectivity can be divided into 4 types: uniform connectivity, unidirectional connectivity, linear connectivity and single well onrush connectivity, of which the unidirectional and onrush connectivity-type waterflooding well groups are dominant, showing it is characterized by heterogeneity. For the reservoir with active edge and bottom water, the producing energy can be recovered effectively while its interwell connectivity is good.

Key words: Junggar basin, connectivity, production performance, multivariate regression, mathematical model