Water injection dominant channel identification and microsphere blocking particle size selection method and apparatus

The present invention provides a water injection dominant channel identification and microsphere blocking particle size selection method and apparatus, and relates to the technical field of clastic oil and gas development. The method comprises: determining the clay mineral related characteristic data of the marine clastic reservoir; dividing the marine clastic reservoir into a plurality of to-be-studied reservoirs by the size of the average throat radius; establishing an interpretation model of permeability of the to-be-studied reservoir of the marine clastic and the reservoir throat radius, and calculating the core average throat radius of the marine clastic corresponding to each to-be-studied reservoir; according to the reservoir permeability of the to-be-studied reservoir under different flooding levels, determining the threshold value of the water injection dominant channel; establishing an interpretation model of core porosity of the marine clastic and the core permeability of the marine clastic; determi