A Conductivity Model for Inequigranular Sandstones Based on Material Properties with Pore Geometric Conduction Theory and Effective Medium Conduction Theory

Abstract

The characteristics of inequigranular sandstone reservoirs in S3 Formation in Lei 64 Area are strong heterogeneity, complex pore structures and shale-bearing, therefore accurate calculation of water saturation becomes focus and difficult in calculation of oil reserves of inequigranular sandstone reservoirs. Based on the pore geometric conduction theory and effective medium conduction theory, a conductivity model for inequigranular sandstone reservoirs is established in this paper. In this model, the pore geometric conduction theory is used to describe the influence of pore structures on sand conductivity, the effective medium conduction theory is used to describe the influence of shale on sand conductivity. The two kinds of theory are combined through conductivity of equivalent pore fluid. Then, the log data of Lei xxx are processed with the model, and the results are compared with well test results. The results show that the new model can be applied in saturation evaluation of inequigranular sandstone reservoirs in Lei 64.