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

Figure 10

Shape characteristics of clay minerals in 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) Arranging loose flake kaolinite, intergranular pore development (Taiyuan Formation); (b) dissolution pores and worm-like kaolinite (Shanxi Formation); (c) authigenic quartz occurring with illite (Taiyuan Formation); (d) autogenous albite occurring together with filamentous illite and kaolinite (Taiyuan Formation); (e) bridging illite (Taiyuan Formation); (f) fibrous illite (Taiyuan Formation).