The microscopic pore structure of reservoirs provides the basis for shale oil exploration and development. In our analyses of the pore development characteristics of shale oil reservoirs, we integrated the argon-ion scanning electron microscopy test and a statistical method to determine the parameters of the pore images of the reservoir. Eighteen rock-core samples of the Shahejie Formation in the Dongying Sag, Bohai Bay Basin, China, were used in the analyses. The results indicate that the main pore types o...