Abstract
The Carboniferous-Permian Taiyuan-Shanxi coal-bearing formations, as the most promising shale-gas reservoir in North China, comprise a typical shale-gas system developed in a transitional environment. To investigate the pore structure of the Taiyuan-Shanxi shale in the Southern North China Basin, field-emission scanning electron microscopy (FE-SEM), low-pressure nitrogen adsorption (LNA), and high-pressure mercury intrusion (HMI) were employed to characterize the pore type, volume, and size distributions of 11 shale samples from the Mouye-1 well. Organic-matter-hosted pores, interparticle pores, intraparticle pores, and shrinkage cracks were observed in the FE-SEM images. Compared to matured marine shale, the number of organic-matter-hosted pores within the Taiyuan-Shanxi shale was much smaller, probably because of the high content of inertinite. The nitrogen total pore volume was found to range from 20.36 × 10–3 to 31.23 × 10–3 mL/g, whereas the mercury total pore volume was found to range from 2.1 × 10–...
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