Lithofacies analysis system and method based on shale geological - mechanical coupled lithofacies classification system

A lithofacies analysis system based on a shale geological-mechanical coupled lithofacies classification system, comprising:

• a data acquisition module acquires information data, comprising geological lithofacies data and in-situ mechanics parameter data;
• a system construction module connected to the data acquisition module determines a geological-mechanical coupled lithofacies classification system based on the information data;
• a prediction module connected to the system construction module performs, by the geological-mechanical coupled lithofacies classification system, single-well quantitative prediction of lithofacies based on logging data, and acquires single-well lithofacies prediction information, wherein the single-well lithofacies prediction information refers to a prediction result of single-well geological-mechanical coupled lithofacies in an entire wellbore space within a range of a bed of interest, and is configured to characterize a facies sequence change characteristic of the single-well geological-mechanical coupled lithofacies along a wellbore;
• a feedback adjustment module connected to the prediction module performs feedback adjustment on the single-well lithofacies prediction information based on a set range of a rock mechanics and geostress parameter, and acquires adjustment information;
• a three-dimensional model construction module connected to the feedback adjustment module performs, by a genetic algorithm, seismic attribute embedding and integrated inversion based on seismic attribute data and the adjustment information, and constructs, by a collaborative Kriging method, a three-dimensional model for well-seismic collaborative modeling of the geological-mechanical coupled lithofacies, wherein the three-dimensional model is a three-dimensional physical simulation model constructed based on an inherent relationship between respective properties of a geological lithofacies and the geological-mechanical coupled lithofacies, and configured to characterize a mechanical heterogeneity difference and distribution law of the geological lithofacies;
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• a parameter model determination module connected to the three-dimensional model construction module and configured to determine, by a layer control-facies control constraint, a geological-mechanical coupled lithofacies control rock mechanics and geostress parameter model based on the three-dimensional model, wherein the parameter model characterizes three-dimensional spatial distribution heterogeneity of a geological-mechanical characteristic of a shale bed, thereby providing a basis for the exploration and development of an artificial oil and gas reservoir in a production area.