Foreign component determination and rock naming method suitable for pulveryte

The invention provides a method suitable for determining genetic components of pulveryte and naming rocks. The technical core is to carry out slice identification and X-diffraction matching analysis on a sample, and the slice identification and the X-diffraction matching analysis are mutually constrained to realize determination or correction of the content of cause components: slice observation determines main cause components and structural characteristics, and focuses on analysis of different occurrence states of the same mineral; and on the basis of the structure constraint, determining or correcting the content of the cause component identified by the slice through content deduction or splitting by utilizing an X-diffraction analysis result. The cause component determined by the method can reflect the rock deposition cause or characteristic diagenesis event, and has important reference significance for pulveryte classification, lithofacies division and shale oil and gas sweet spot evaluation and predicti