Automatic lithogenous phase identification and division method

The invention belongs to the field of shale oil-gas exploration and shale lithofacies automatic identification, and particularly discloses a lithogenous facies automatic identification and division method which comprises the following steps: selecting a standard shale sample of a target layer in a research area, obtaining digital experimental data and mineral image experimental data, and establishing a lithogenous facies classification and division standard; logging information of a target well in a research area is obtained, and logging curve data pretreatment is carried out; carrying out automatic identification and division on the lithogenous phase based on RNN + LSMT lithogenous phase automatic labeling model training; dividing lithogenous phase types based on logging information and logging empirical formulas; and comparing a lithogenous phase division result and comprehensively outputting a final lithogenous phase division result. According to the method, automatic division of shale lithogenous phases c