The Exquisite Comparison of Shale Mineralogical-Geochemical Characteristics between Chang 7 Member and Chang 9 Member in Yanchang Formation, Ordos Basin

Figure 2

Lithological and logging characteristics of the Yanchang Formation shale in the study area. The photos column: (I) pyrite framboids aggregate in Chang 7 member shale; (II) rock thin sections of Chang 7 member; (III) microscopic photos of rock thin sections; (IV) barites; (V) pyrite framboids in C9M shale; and (VI) rock thin sections of C9M.