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

<div>Mercury injection curves for Wufeng-Longmaxi shales. The mercury intrusion curves exhibit two different trends in studied samples, which are presented in (a, b). (a) Types of samples N2 to N5 with relatively lower TOC contents. The volume of mercury intrusion first increases (0.01–1 MPa) and is then kept stable (1–400 MPa). (b) Types of samples N8 to N10 with higher TOC contents. The volume of mercury intrusion shows a rapid increase (0.01–1 MPa), a relatively stable phase (1–50 MPa), and a rapidly increasing phase (50–400 MPa).</div>

Geofluids

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Figure 15

Figure 15: Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S. 

Figure 15 | Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S. 