Abstract: The core scanning image analysis is a new technology of core observation generally rose with the rapid development of information sciences recently. From core scanning, image treatment and geologic analysis three respects, the technology was introduced systematically, and the methods of core image treatment and related sedimentary structural parameter calculation were expounded. Combined with examples, pore and fracture targets were picked up and related parameters were calculated automatically by core images. In the case of well Chegu-201, by core observation and core scanning image analysis and combined with laboratory rock and mineral identification and conventional petrophysical property testing, the pore development and oil-bearing characteristics of the Ordovician carbonate rock reservoirs in the Lower Paleozoic of the well were studied comprehensively.