Lithofacies-based meandering river reservoir microscopic pore throat classification evaluation method

The invention provides a lithofacies-based meandering river reservoir microscopic pore throat classification evaluation method, which comprises the following steps of: 1, establishing a lithofacies division method, and determining the lithofacies type of a meandering river reservoir under the control of sedimentary microfacies; 2, determining lithofacies discriminant logging characteristic parameters, and establishing different lithofacies logging quantitative interpretation modes by applying a Bayesian discriminant analysis theory; 3, selecting sensitive parameters of microscopic pore throat evaluation according to a correlation evaluation result; 4, establishing classification evaluation standards of different lithofacies microscopic pore throat structures of the meandering river reservoir; and step 5, establishing a microscopic pore throat structure evaluation model of the lithofacies, and determining microscopic pore throat characteristics of different lithofacies. According to the method, a comprehensive