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

Table 2

North America Shale and Chang 7 Shale elemental concentrations.

Elements	North America shale								Chang 7 Shale
	Woodford Fm		Barnett Fm		Ohio Shale		Eagle Ford Fm
	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Average
Si (%)	5.89	38.2	6.22	32.7	26.8	28.8	3.75	22.6	7.508	38.91	26.36
Al (%)	0.64	7.62	1.2	8.47	6.87	10.77	1.07	5.98	2.851	11.31	7.91
Fe (%)	0.61	4.92	0.64	3.54	3.09	4.6	0.43	3.57	1.72	13.81	5.04
K (%)	0.17	3.51	0.27	1.83	2.92	4.32	0.14	1.61	0.7	2.71	1.9
Ca (%)	0.07	18.1	2.77	31.2	0.19	0.71	9.36	34.7	0.32	24.07	2.02
Mg (%)	0.27	10.25	0.52	2.64	0.66	1.08	0.24	0.66	0.33	4.49	1.02
S (%)	0.46	5.32	0.25	2.24	0.72	2.25	0.33	3.81	0.026	5.024	0.91
P (%)	0.01	0.48	0.07	0.98	0.02	0.17	0.02	0.15	0.047	0.94	0.217
Ti (%)	0.04	0.33	0.07	0.46	0.4	0.53	0.04	0.39	0.083	0.575	0.42
Mn (%)	0.008	0.325	0.008	0.031	0.008	0.031	0.008	0.023	0.011	0.355	0.09

Bold and italic are the maximum and minimum values of this element, respectively.