X-Ray Fluorescence for Laminated Silty Shale Reservoirs in Ordos Basin, China: Implications for Lithology Identification

Table 4

Element concentration of three types of lithology.

	Si (%)	Al (%)	Fe (%)	K (%)	Ca (%)	Mg (%)
Argillaceous shale	14.25~34.17	4.12~11.31	2.48~13.81	1.14~2.71	0.32~7.80	0.33~1.75
Silty laminated shale	18.30~38.91	3.71~10.25	1.72~7.32	0.59~2.46	0.51~7.57	0.47~1.90
Calcareous laminated shale	2.93~18.54	0.53~5.40	3.26~9.65	0.70~1.94	8.95~24.07	1.35~4.49