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Five shale samples preserved from the oil window of four unconventional reservoirs were solvent-extracted using toluene and methanol for high-resolution, secondary-electron imaging with field emission scanning electron microscopy (SEM) of the textures of organic matter (OM) present at or near induced fracture surfaces. The samples represent calcareous, siliceous, and mixed mineralogy mudrocks. Based on their nanoscopic textures, nine categories of OM could be distinguished: (1) nonporous particles, (2) low-porosity masses (sometimes [3] with mineral crystallites), (4) spherule aggregates, (5) intermediate-porosity granular masses, and (6) high-porosity foamy frameworks between mineral grains, together with (7) thick, (8) thin, or (9) very...

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