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

Table 3

Element contents of shale layers ① ~ ⑨ in Well Y1.

	Si (%)	Al (%)	Fe (%)	K (%)	Ca (%)	Mg (%)
①	26.84~38.91	5.18~9.02	1.72~5.67	1.47~2.38	0.54~1.36	0.71~1.05
②	11.87~30.20	4.13~10.16	3.76~9.98	0.92~2.71	0.32~24.07	0.33~3.57
③	7.58~30.55	2.93~10.73	2.87~10.03	0.74~2.51	0.70~22.18	0.61~4.49
④	17.16~21.24	5.57~11.31	4.32~6.30	1.78~2.51	0.44~1.27	0.67~1.23
⑤	9.96~30.03	2.58~8.68	2.87~7.23	0.73~2.42	0.63~21.87	0.62~2.62
⑥	17.16~22.56	4.47~9.57	4.55~9.81	1.69~2.55	0.59~1.43	0.36~1.19
⑦	2.93~32.41	0.53~9.61	2.76~10.10	0.70~1.95	0.66~17.75	0.47~3.15
⑧	14.5 ~ 29.76	4.55~10.63	3.77~13.81	1.14~2.22	0.51~7.80	0.52~2.71
⑨	25.37~31.72	6.06~9.19	3.14~4.85	0.91~1.81	0.62~3.65	0.67~1.22