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The purpose of this article is to make a comparative study on the pore structure of different sedimentary facies shales developed in typical areas, China. Results show that the surface area (SA) and pore volume (PV) of the over-mature marine shales are in the range of 17.83–29.49 m²/g and 3.65–18.26 ml/kg, respectively, which are much higher than that of the highly mature transitional and less mature terrestrial shales in the range of 0.9–1.9 m²/g and 2.5–10.9 ml/kg, respectively. In the view of the pore-size distribution (PSD), marine shales concentrate at the fine mesopores < 10 nm, while the terrestrial and transitional shales focus on the large-mesopores to fine-macropores (30–70 nm). Additionally, the qualitative analysis of hysteresis loops from the nitrogen isotherms reveals that the marine shales are dominated by the inkbottle-shaped pores, which are further confirmed to be the organic pores. While the …