Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S.

<div>(a, b) Organic petrography photomicrographs (oil immersion, white incident light) of Ordos shale. The maceral of Ordos shale is composed of vitrinite and inertinite. (c, d) SEM images showing typical maceral types and the internal pore structure of Xiuwu shale.</div>

Geofluids

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Figure 8

Figure 8: Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S. 

Figure 8 | Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S. 