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1. A three-dimensional visualization expression method for a multi-scale geological structure model, comprising following steps: collecting geological exploration data, wherein the geological exploration data comprises geophysical prospecting information, drilling information, outcrop survey information, seismic information and geological age data; performing interpolation simulation on the geological exploration data to obtain an exploration sample set; preprocessing the exploration sample set to obtain preprocessed data, wherein the preprocessing comprises data cleaning, format unification and noise removal; constructing a multi-scale geological structure model according to the preprocessed data based on a three-dimensional modeling technology; performing scale decomposition on the geological structure model using a multi-scale analysis method to form model representations at different scale levels; and converting the model representations into three-dimensional visualization images using a three-dimensional graphics processing technology; and wherein the constructing a multi-scale geological structure model according to the preprocessed data based on a three-dimensional modeling technology comprises: constructing a microphase scale model, a structural model and an initial geological model according to the preprocessed data; based on the microphase scale model, the structural model and the initial geological model, constructing a flow simulation process in a real geological environment according to a preset scaling strategy; and updating the microphase scale model, the structural model and the initial geological model according to the flow simulation process to obtain the geological structure model.
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