Organic-rich marine shale in South China has great potential for gas generation, and the pore structure has a considerable influence on the enrichment of shale gas. The nanoscale pore characteristics and fractal characteristics of the Niutitang shales in the Fenggang block were studied by means of methane adsorption and low-pressure nitrogen adsorption experiments, porosity and permeability tests, X-ray diffraction analyses, organic geochemical analyses, and field emission scanning electron microscopy. The fractal geometry of the pore structure was assessed, and the factors influencing the pore structure were determined. We used a fractal Frenkel-Halsey-Hill-based method to obtain the fractal dimensions D1 and D2 by nitrogen adsorption at relative pressures of 0-0.5 and 0.5-1, respectively. The relationships between the shale pore structure parameters and the fractal dimensions, the mineral composition,

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