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

<div>Geological background and core location (well NX is marked as a colored dot in Changning area) in Sichuan Basin in the southwest of China. Sichuan Basin is surrounded by the orogenic belt around Longmen Mountain, Jinhe Mountain, and Qinling Mountain. The study region is located in the southwest region of Sichuan Basin.</div>

Geofluids

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Figure 1

Figure 1: Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S. 

Figure 1 | Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S. 