Multiscale Fine Characterization of a Coal Pore–Fracture System Based on SEM, CT, and NMR in the Jingbian Block, Ordos Basin

To achieve an accurate and comprehensive characterization of the multiscale pore–fracture characteristics Permian coal in Jingbian Block, Ordos Basin, a combination scanning electron microscopy (SEM), X-ray computed tomography (CT), nuclear magnetic resonance (NMR) techniques was utilized. With these experiments, mineral composition, pore size distribution (PSD), porosity, connectivity pores samples were characterized through qualitative quantitative methods. The results show that SEM experiments enabled identification types. primarily contained gas pores, cell intercrystalline moldic clay minerals predominant fracture fillings. 3D reconstruction CT shows fractures generally expand horizontally, while obvious bedding expansion characteristics. Moreover, estimation full-size porosity can be achieved by combining NMR experiments. G11-5-1, G11-5-6, G11-5-9, G11-5-11 8.93%, 9.11%, 10.45%, 11.63%, respectively. differences are determined throat development degree connected count. Samples with more larger radii exhibit excellent connectivity.