Research Article
Petrographic Characterization and Maceral Controls on Porosity in Overmature Marine Shales: Examples from Ordovician-Silurian Shales in China and the U.S.
Figure 17
(a) Micro-FTIR spectra of pyrobitumen and graptolite in studied samples. The first two are of pyrobitumen, and the third and fourth show graptolite in Wufeng-Longmaxi shale and Utica shale, respectively. (b) Micro-FTIR spectra of alginite, AOM, solid bitumen, vitrinite, and inertinite from New Albany Shale samples () (adapted from [89]).
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