Figure 4
From: Geometric Heterogeneity of Continental Shale in the Yanchang Formation, Southern Ordos Basin, China
Laminas with different compositions of minerals. (A) The sandy lamina is grayish-white, the tuffaceous lamina is brown, and the organic matter-enriched lamina is black. (B) BSE image of mineral analysis of shale from the YK01 well. Oligoclase is dominant, followed by orthoclase, pyrite, organic matter, and quartz. The white box amplified on the right indicates that the minerals in the shale have a layered distribution.
