Paleoenvironment, Geochemistry, and Pore Characteristics of the Postmature to Overmature Organic-Rich Devonian Shales in Guizhong Depression, Southwestern China

Table 1

Major element content and element ratios of Devonian shale of GY-1 well.

Depth																	δU	V/V+Ni	V/Cr	Ni/Co	U/Th		Sr/Ba
300.70 m	91.16	247.34	69.79	11.01	17.49	9.27	40.64	144.93	207.42	99.38	166.97	2735.54	22489.38	827.12	7.29	8.69	1.3	0.54	1.68	5.88	0.45	10.81	0.3
350.10 m	93.43	167.94	72.54	8.94	15.23	5.01	31.86	119.88	178.04	79.43	175.22	2730.23	10514.21	768.42	8.65	8.13	0.87	0.51	2.21	5.47	0.26	11.42	0.22
399.70 m	124.73	136.84	77.4	14.87	43.16	18.82	31.99	138.24	386.86	165.02	135.58	4063.01	21241.92	734.01	12.94	13.64	1.3	0.59	0.82	7.23	0.44	9.85	0.19
451.30 m	145.89	151.77	68.97	14.7	9.51	0.001	74.33	128.48	333.27	159.78	157.48	4373.91	6268.96	803.56	12.69	13.66	1.22	0.55	0.99	5.01	0.71	7.56	0.19
499.50 m	112.81	181	92.88	6.39	10.64	0.001	53.14	133.7	286.59	71.72	190.87	3464.37	3513.37	936.34	8.82	7.91	1.45	0.59	2.66	6.17	0.9	8.2	0.19
550.70 m	110.17	305.17	89.57	11.58	20.19	20.62	99.26	170.06	268.02	101.64	231.84	3718.66	19320.6	913.31	11.61	2.03	1.29	0.63	2.28	5.19	0.6	10.2	0.33
599.90 m	114.31	216.53	80.92	6.6	40.08	39.61	119.05	193.03	222.82	99.69	288.39	3620.85	24523.35	877.75	9.59	8.41	1.34	0.67	2.89	5.59	0.67	9.11	0.25
649.50 m	87.5	252.36	79.42	17.86	34.28	19.6	165.57	150.07	274.15	89.57	373.79	2523.86	7612.05	1211.87	9.12	18.34	1.42	0.71	4.17	6.93	1.3	7.63	0.28
700.30 m	31.04	294.81	21.94	5.45	13.58	8.7	81.84	97.68	348.11	0.001	132.09	531.95	2881.06	1341.49	6.01	9.44	1.43	0.87	5.67	7.12	0.84	6.32	0.43
750.20 m	86.64	96.75	81.85	9.54	59.83	25.87	255.47	173.8	216.88	134.4	381.8	2502.73	28648.95	1113.62	9.15	10.01	1.55	0.69	2.84	7.85	1.13	7.13	0.09
799.40 m	66.76	333.43	58.97	12.75	25.21	43.28	96.88	183.84	337.36	83.93	232.4	2182.99	15541.45	1428.57	8.75	10.64	1.04	0.68	2.77	8.32	0.47	9.89	0.33
848.30 m	33.21	454.22	26.63	6.04	13.29	7.77	93.99	128.95	3481.92	0.001	110.67	619	3735.33	807.5	6.23	9.01	0.92	0.46	1.75	6.26	0.55	11.49	0.56
901.80 m	151.6	36.03	84.64	14.5	48.94	8.29	48.16	101.39	148.73	120.8	178.74	5550.84	2847.54	511.3	16.74	10.66	0.89	0.42	1.48	4.93	0.64	8.73	0.03
951.20 m	95.12	49.52	125.06	22.98	6.54	8.72	19.58	76.69	249	120.38	217.8	4583.87	3012.26	762.31	14.06	20.54	1.16	0.51	1.81	5.76	0.46	10.03	0.04