Rare Earth Partition Characteristics and Sedimentary Diagenetic Response in Layered Argillaceous Limestone: Taking the Shale of Upper Es4 in the Nx55 Well Area as an Example

Table 2

Standardized rare earth element (REE) distribution patterns of laminated argillaceous sparry limestone to chondrites.

Sample point					LREE	HREE						Component
Chondrite	/	/	/	/	2.11	1.18	/	/		3.29	1.79
North American shale	6.99	15.88	3.53	1.35	152.84	20.37	0.70	1.11		173.21	7.50
1	7.14	0.56	2.11	1.20	1.53	0.49	1.77	0.84	-0.24	2.02	3.15	Calcite vein
2	18.44	1.56	5.65	5.41	5.07	1.70	2.62	0.81	-0.15	6.78	2.98	Calcite vein
3	23.40	2.75	2.97	6.26	184.41	31.23	0.95	0.96	-0.06	215.64	5.90	Calcite vein
4	7.52	0.79	2.13	2.58	4.52	0.86	1.58	0.88	-0.12	5.38	5.23	Calcite vein
5	2.64	0.44	2.59	0.86	42.41	20.79	1.16	1.27	0.06	63.19	2.04	Calcite vein
6	10.89	1.07	3.41	2.88	8.47	2.51	2.55	0.91	-0.12	10.98	3.37	Calcite vein
7	9.87	1.43	2.40	2.35	297.60	58.40	0.88	0.86	-0.03	356.00	5.10	Clay
8	7.45	0.69	4.52	1.51	180.67	72.65	0.73	0.86	-0.13	253.32	2.49	Clay
9	82.38	10.91	4.80	8.33	319.28	20.28	0.84	1.03	-0.01	339.56	15.74	Interface between argillaceous lamina and sparry calcite
10	159.10	22.29	6.27	11.27	968.16	26.37	0.78	1.05	0.002	994.53	36.71
11	7.33	0.70	3.07	1.90	37.48	12.57	1.03	0.97	-0.13	50.05	2.98
12	27.32	2.34	7.02	4.05	29.15	4.90	1.78	0.89	-0.14	34.05	5.95	Calcite vein
13	6.63	0.22	4.57	1.20	0.35	0.12	4.07		-0.51	0.47	3.02	Calcite vein
14	12.42	1.69	3.47	2.38	407.25	75.78	0.94	1.02	-0.02	483.04	5.37	Clay
15	15.02	1.91	5.90	1.81	440.49	73.68	0.86	1.07	-0.01	514.17	5.98	Micrite calcite
16	23.68	3.19	3.77	3.91	531.60	66.48	1.01	1.06	-0.01	598.08	8.00	Micrite calcite
17	6.73	0.79	2.80	1.82	200.71	67.82	0.89	0.93	-0.09	268.53	2.96	Clay
18	6.29	0.83	2.48	1.23	253.42	71.29	0.84	0.94	-0.06	324.71	3.55	Clay
19	9.62	1.24	2.94	1.88	347.78	71.47	2.55	0.98	-0.05	419.25	4.87	Clay
20	34.94	4.60	3.96	4.68	537.27	55.38	0.85	1.03	-0.02	592.65	9.70	Micrite calcite
21	6.60	0.76	2.27	1.80	158.30	47.65	0.84	0.91	-0.11	205.95	3.32	Micrite calcite

Note: the chondrite data are from [31]. The North American shale data are from [32].