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

<div>SEM images showing zooclast types and related pores in Wufeng-Longmaxi shale samples. (a–d) Zooclasts, including graptolite, chitinozoan, and acritarch, have no observable pores. (e, g) SEM images of graptolite in natural cores with no polishing. (f, h) Enlarged images of (e, g) in the arrow-pointed area, respectively.</div>

Geofluids

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Figure 10

Figure 10: Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S. 

Figure 10 | Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S. 