RESERVOIR PORE STRUCTURE CLASSIFICATION METHOD BASED ON SPHERE-CAPILLARY MODEL

摘要

A reservoir pore structure classification method based on a sphere-capillary model, comprising: on the basis of a sphere-capillary model, establishing first mapping relationships between a transverse relaxation time T2 and an equivalent pore radius ratio Cd corresponding to different reservoir pore structures; obtaining a measurement of the transverse relaxation time T2 of a rock sample; calculating the equivalent pore radius ratio Cd corresponding to the rock sample according to the measurement of the transverse relaxation time T2, and establishing a second mapping relationship between the measurement of the transverse relaxation time T2 and the equivalent pore radius ratio Cd corresponding to the rock sample; comparing how similar the first mapping relationships are to the second mapping relationship, and obtaining, from the first mapping relationships corresponding to different reservoir pore structures, a first mapping relationship closest to the second mapping relationship; and classifying the reservoir pore structures of the rock sample according to a reservoir pore structure corresponding to the first mapping relationship most similar to the second mapping relationship. The method does not rely on a capillary pressure curve, but instead on the basis of pore structures, providing more detailed classification of reservoir pore structures and achieving a better classification result.