Mechanism Analysis of Organic Matter Enrichment of Upper Ordovician-Lower Silurian Shale in the Upper Yangtze Area: Taking Jiaoye-1 Well in the Jiaoshiba Block as an Example

Table 3

The major elements and trace elements of 20 bentonite samples. Some of the data were referenced in the data of Wang et al. [50], Luo et al. [51], Hu et al. [52], and Tang et al. [53].

Sample	Major elements (%)			Trace elements (ppm)			Ratios
	SiO2	Al2O3	TiO2	Nb	Y	Zr	Nb/Y	Zr/TiO2
1	54.31	23.74	0.79	20.74	48.83	418.90	0.42	0.05
2	70.63	11.79	0.50	26.00	19.30	158.00	1.35	0.03
3	48.91	27.39	0.51	12.47	29.91	260.00	0.42	0.05
4	71.35	13.55	0.46	11.10	34.10	152.00	0.33	0.03
5	70.05	13.88	0.47	10.70	37.50	170.00	0.29	0.04
6	68.34	14.25	0.55	10.80	35.70	160.00	0.30	0.03
7	69.53	14.10	0.38	10.70	41.70	204.00	0.26	0.05
8	57.19	21.39	0.58	18.80	20.50	206.00	0.92	0.04
9	65.49	13.54	0.67	17.90	22.50	285.00	0.80	0.04
10	58.59	20.51	0.60	19.70	21.50	207.00	0.92	0.03
11	63.23	15.69	0.65	23.30	196.00	220.00	0.12	0.03
12	67.92	14.94	0.64	13.50	125.00	162.00	0.11	0.03
13	64.84	15.59	0.60	13.50	130.00	164.00	0.10	0.03
14	49.46	24.54	1.57	214.00	115.00	1363.00	1.86	0.09
15	47.23	25.16	0.38	21.20	40.60	359.00	0.52	0.09
16	36.32	9.81	0.56	12.70	13.90	155.00	0.91	0.03
17	56.83	23.67	0.50	7.59	51.30	144.00	0.15	0.03
18	60.82	21.61	0.46	8.22	55.30	148.00	0.15	0.03
19	51.69	25.57	0.46	15.10	51.80	265.00	0.29	0.06
20	51.48	25.68	0.45	14.90	50.60	264.00	0.29	0.06