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
Table 1
Th and U contents of the four components.
Component
Th content (ppm)
Th average content (ppm)
U content (ppm)
U average content (ppm)
Content level
Calcite vein
0.003–3.99
0.873
0.004~3.14
0.70
Low
Interface between argillaceous lamina and sparry calcite