Pore Structure Differentiation between Deltaic and Epicontinental Tight Sandstones of the Upper Paleozoic in the Eastern Linxing Area, Ordos Basin, China

Figure 9

The quartz cement characteristics of coal-measure sandstone. All sections were selected from wells LXD-2 and LXD-5, which are located in the central part of the study area, and the depths are marked. (a) Quartz overgrowth (Taiyuan Formation); (b) quartz overgrowth (Shanxi Formation); (c) quartz secondary enlargement, crystal shape is better (Taiyuan Formation); (d) pore-filling authigenic quartz that is euhedrally crystallized (Taiyuan Formation).