River facies and physical property synchronous simulation method and system and storage medium

The invention discloses a riverway facies and physical property synchronous simulation method, a riverway facies and physical property synchronous simulation system and a storage medium. The method comprises the following steps: acquiring a width range and a thickness range of a first-stage riverway sand body of a braided river reservoir; according to the width range and the thickness range of the first-stage river channel sand body, a first-stage river channel facies model is established through a Fluvsim method, and the sand-ground ratio of the first-stage river channel is obtained; controlling and simulating a first-stage riverway physical property model through the first-stage riverway facies model; and obtaining the width range and the thickness range of a next-stage river channel sand body in the same braided river reservoir, establishing a next-stage river channel facies model on the basis of the previous river channel facies model through a Fluvsim method, and establishing a final river channel facies