Rare Earth Partition Characteristics and Sedimentary Diagenetic Response in Layered Argillaceous Limestone: Taking the Shale of Upper Es4 in the Nx55 Well Area as an Example

Figure 2

Lithology types of 3783.55–3790.63 m core section of Nx55. (a) Crossed polarizers photo: laminated argillaceous sparry limestone, clay organic matter lamina, recrystallized calcite lamina, and calcite vein overlap. (b) Fluorescent photo: the overlap of three laminae. (c) Cathodoluminescence photo: clay organic matter and recrystallized calcite laminae overlap. (d) Single polarized photo: micrite calcite lamina, felsic minerals, and clay organic matter lamina overlap. (e) Fluorescent photo: overlap of argillaceous silt, felsic minerals, and clay organic matter lamina. (f) Overlap of micritic calcite and clay organic matter laminae. (g) Overlap of argillaceous silt, felsic minerals, and clay organic matter lamina. (h) Fluorescent photo of argillaceous silt, felsic minerals, and clay organic matter lamina. (i) Cathodoluminescence photo of argillaceous silt. (j) Felsic minerals and clay organic matter. (k) Fluorescent photo of felsic minerals and clay. (l) Cathodoluminescence photo of felsic minerals and clay.