苏北地区早寒武世黑色页岩地球化学特征与有机质富集模式

doi:10.11743/ogg20200416

Abstract

Abstract:

A set of black shale deposited in the Early Cambrian and characterized by a large thickness and high organic matter content is one of the important exploration target strata for marine shale gas in South China.The sedimentary environment and enrichment mechanism of organic matters in the black shale are discussed based on the core and geochemical data from Well XYZ-1 drilled through the Early Cambrian Mufushan Formation in northern Jiansu area.The Mufushan Formation in Well XYZ-1 is a set of depositional sequence of black and dark gray carbonaceous shale with stone coal layers on top and at bottom and interbeds of thin-layered carbonate rocks.The average values of V/(Ni+V), Ni/Co, U/Th, and V/Sc are 0.74, 6.78, 1.46, and 65.43, respectively.These ratios as indicators of redox environment suggest that the sediments were under anoxic conditions and two strong sulfidation events once occurred at the bottom and top.The average total organic carbon (TOC) content of the Mufushan carbonaceous shale is 5.62%, with the TOC value of 72.2% of the samples collected greater than 2%.The TOC-TS correlation coefficient is as high as 0.89.The hypoxic environment with sulfidation events provided favorable conditions for the enrichment and preservation of organic matters, thus laid down foundation for the development of high-quality source rocks and reservoirs in the Mufushan Formation of northern Jiansu.

Key words: enrichment of organic matter, black shale, Mufushan Formation, Early Cambrian, northern Jiangsu area

CLC Number:

TE135

Yuxi Zhang, Jianwen Chen, Jiangyu Zhou. Geochemical features and organic matter enrichment in the Early Cambrian black shale, northern Jiangsu area[J]. Oil & Gas Geology, 2020, 41(4): 838-851.

Figures/Tables 10

Fig.1

Table 1

Content of major elements in the Mufushan Formation from Well XYZ-1 in northern Jiangsu area"

层位	样品	有机碳和元素含量/%
层位	样品	TOC	SiO₂	Al₂O₃	CaO	Fe₂O₃	K₂O	MgO	MnO	Na₂O	P₂O₅	TiO₂
幕Ⅲ段	G1	8.74	53.05	9.45	9.36	4.56	3.35	1.77	0.03	0.01	0.19	0.50
	G2	7.08	51.49	4.24	17.80	1.63	1.70	1.42	0.02	0.01	0.09	0.21
	G3	10.68	48.20	5.12	13.89	1.66	2.09	4.11	0.03	0.01	0.19	0.26
	G4	10.60	65.09	2.12	11.15	1.71	0.79	0.93	0.02	0.01	0.31	0.11
幕Ⅱ段	G5	4.20	60.65	2.52	16.57	0.27	0.94	2.01	0.03	0.01	0.06	0.17
	G6	3.05	48.56	7.49	13.65	1.30	2.49	5.81	0.04	0.01	0.16	0.54
	G7	5.56	29.86	3.95	31.84	0.43	1.35	2.66	0.05	0.01	0.09	0.27
	G8	8.60	19.27	2.88	40.23	0.28	1.04	1.47	0.07	0.01	0.04	0.17
	G9	2.72	50.88	7.89	12.67	1.02	2.66	5.28	0.05	0.01	0.17	0.57
	G10	8.52	16.73	2.13	42.64	0.17	0.66	1.36	0.05	0.01	0.03	0.14
	G11	1.34	68.59	6.19	8.66	1.03	2.11	1.92	0.02	0.01	0.11	0.36
	G12	1.70	55.00	9.76	10.44	1.24	2.70	4.00	0.02	0.01	0.10	0.55
	G13	5.08	12.93	2.06	45.00	0.04	0.58	1.42	0.05	0.01	0.04	0.11
	G14	2.77	52.82	7.74	12.38	0.77	2.07	4.56	0.03	0.01	0.10	0.48
	G15	1.45	57.60	9.35	7.96	1.20	2.49	4.91	0.02	0.01	0.12	0.54
	G16	6.02	18.25	2.52	41.10	0.24	0.60	1.48	0.04	0.01	0.16	0.13
	G17	1.10	59.75	9.65	5.80	2.42	2.58	4.95	0.02	0.01	0.13	0.55
	G18	9.82	25.31	3.32	35.12	0.02	0.87	2.25	0.03	0.01	0.06	0.18
	G19	1.39	57.29	9.58	6.51	1.33	2.68	6.07	0.03	0.01	0.12	0.58
	G20	1.74	55.76	8.80	10.85	1.84	2.31	3.72	0.03	0.04	0.12	0.48
	G21	6.66	15.38	2.38	43.39	0.72	0.50	1.21	0.04	0.29	0.05	0.11
	G22	1.57	59.92	9.93	6.99	0.67	2.68	4.29	0.02	0.18	0.12	0.55
	G23	1.63	65.15	8.07	5.08	1.04	2.09	4.69	0.01	0.02	0.23	0.44
	G24	9.25	33.03	1.55	33.20	0.28	0.45	1.87	0.02	0.02	0.07	0.08
	G25	2.08	60.75	6.70	9.25	1.13	1.70	4.42	0.02	0.01	0.16	0.41
	G26	7.53	21.45	1.80	40.31	0.21	0.39	1.03	0.03	0.01	0.06	0.10
	G27	1.09	82.74	4.32	1.99	1.00	1.31	1.78	0.01	0.01	0.17	0.20
	G28	6.20	17.58	1.70	42.61	0.17	0.35	1.20	0.02	0.01	0.04	0.09
	G29	1.68	60.57	7.37	7.64	0.80	1.92	5.11	0.02	0.01	0.10	0.43
	G30	2.50	58.50	7.33	8.27	0.98	1.73	5.22	0.02	0.03	0.20	0.40
	G31	7.54	28.00	3.83	33.51	0.92	0.87	1.43	0.05	0.24	0.09	0.22
	G32	4.60	45.17	10.26	14.64	1.25	2.94	3.11	0.03	0.18	0.10	0.53
	G33	4.09	47.41	11.17	11.46	1.46	3.28	3.01	0.03	0.01	0.10	0.60
幕Ⅰ段	G34	2.66	51.37	15.68	0.44	4.55	7.63	1.74	0.01	0.06	0.15	0.56
	G35	21.27	39.93	9.52	4.48	3.44	5.25	2.43	0.01	0.01	0.22	0.41
	G36	19.99	31.67	8.65	8.23	2.41	3.30	2.37	0.00	0.01	1.39	0.42
平均值		5.62	45.16	6.31	18.48	1.23	2.01	2.97	0.03	0.04	0.16	0.35

Table 1

Fig.2

Table 2

REE content of the Mufushan shale from Well XYZ-1 in northern Jiangsu area"

样品	稀土元素含量/10^-6																		ΣLREE/ ΣHREE	(La/ Yb)_N	(Gd/ Yb)_N	Y/Ho	δCe
样品	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	ΣREE	ΣLREE	ΣHREE	ΣLREE/ ΣHREE	(La/ Yb)_N	(Gd/ Yb)_N	Y/Ho	δCe
G1	26.20	47.80	5.88	22.10	3.96	0.71	3.39	0.46	3.00	0.59	1.80	0.30	1.95	0.28	18.60	118.42	106.65	11.77	9.06	9.06	1.40	31.53	0.93
G2	18.70	33.90	4.29	16.50	3.31	0.67	3.04	0.46	2.83	0.55	1.65	0.26	1.57	0.23	17.30	87.96	77.37	10.59	7.31	8.03	1.56	31.45	0.91
G3	19.10	35.00	4.39	16.90	3.32	0.64	3.09	0.45	2.88	0.59	1.69	0.26	1.71	0.25	19.70	90.27	79.35	10.92	7.27	7.53	1.46	33.39	0.92
G4	14.70	29.90	3.35	13.80	2.69	0.52	2.70	0.38	2.31	0.43	1.14	0.17	0.96	0.14	14.40	73.19	64.96	8.23	7.89	10.32	2.27	33.49	1.03
G5	24.50	33.10	3.84	12.60	1.69	0.29	1.28	0.17	1.03	0.19	0.56	0.09	0.56	0.09	5.80	79.99	76.02	3.97	19.15	29.50	1.84	30.42	0.82
G6	15.50	26.90	3.28	11.80	2.11	0.39	1.77	0.25	1.54	0.29	0.87	0.14	0.91	0.13	7.90	65.88	59.98	5.90	10.17	11.48	1.57	27.48	0.91
G7	13.70	22.60	2.86	10.60	1.89	0.42	1.77	0.25	1.60	0.32	0.90	0.14	0.95	0.13	8.90	58.13	52.07	6.06	8.59	9.72	1.50	27.81	0.87
G8	12.70	19.90	2.61	9.90	2.02	0.44	1.86	0.29	1.87	0.36	1.05	0.16	1.04	0.15	10.50	54.38	47.60	6.78	7.02	8.23	1.44	29.17	0.83
G9	20.00	34.10	4.25	15.60	2.59	0.47	2.13	0.29	1.88	0.35	1.11	0.19	1.19	0.19	9.70	84.34	77.01	7.33	10.51	11.33	1.44	27.74	0.89
G10	10.50	16.80	1.87	6.70	1.26	0.32	1.12	0.18	1.24	0.25	0.77	0.12	0.87	0.13	7.90	42.09	37.41	4.68	7.99	8.14	1.04	31.68	0.91
G11	13.90	22.80	2.99	11.00	1.86	0.34	1.65	0.22	1.21	0.25	0.73	0.11	0.71	0.11	7.00	57.88	52.89	4.99	10.60	13.20	1.88	28.08	0.85
G12	27.30	39.80	5.51	19.70	3.36	0.61	2.74	0.38	2.42	0.48	1.37	0.21	1.49	0.22	14.00	105.59	96.28	9.31	10.34	12.35	1.48	29.17	0.78
G13	12.70	18.30	2.46	9.50	1.78	0.50	1.63	0.26	1.62	0.31	0.83	0.14	0.82	0.11	9.60	51.04	45.32	5.72	7.92	10.44	1.60	31.19	0.79
G14	20.70	32.10	4.23	15.30	2.48	0.45	2.15	0.30	1.81	0.35	1.01	0.17	1.10	0.16	10.50	82.31	75.26	7.05	10.68	12.69	1.58	30.00	0.83
G15	22.10	34.10	4.51	16.50	2.65	0.44	2.10	0.30	1.79	0.34	0.99	0.16	1.00	0.15	10.30	87.13	80.30	6.83	11.76	14.90	1.69	30.29	0.82
G16	18.80	28.40	4.22	16.50	3.45	0.80	3.28	0.44	2.59	0.48	1.32	0.17	1.24	0.16	16.30	81.85	72.17	9.68	7.46	10.22	2.13	33.96	0.77
G17	25.60	39.40	5.25	18.90	3.04	0.43	2.19	0.31	1.86	0.36	1.06	0.18	1.21	0.17	9.90	99.96	92.62	7.34	12.62	14.26	1.46	27.50	0.82
G18	17.10	25.00	3.47	13.10	2.50	0.54	2.26	0.34	2.11	0.41	1.27	0.19	1.30	0.19	13.80	69.78	61.71	8.07	7.65	8.87	1.40	33.66	0.78
G19	23.40	36.40	4.87	17.90	2.82	0.44	2.28	0.32	2.08	0.40	1.19	0.18	1.30	0.17	12.40	93.75	85.83	7.92	10.84	12.14	1.42	31.00	0.82
G20	30.10	42.80	6.12	21.40	3.65	0.63	2.93	0.44	2.53	0.47	1.49	0.21	1.45	0.20	14.40	114.42	104.70	9.72	10.77	14.00	1.63	30.64	0.76
G21	17.50	22.80	3.24	11.70	2.37	0.57	2.35	0.36	2.30	0.45	1.42	0.22	1.47	0.18	17.50	66.93	58.18	8.75	6.65	8.03	1.29	38.89	0.73
G22	23.70	33.90	4.54	16.50	2.83	0.44	2.10	0.32	1.95	0.39	1.13	0.19	1.30	0.19	12.10	89.48	81.91	7.57	10.82	12.29	1.30	31.03	0.79
G23	20.10	31.10	3.87	13.30	2.05	0.24	1.60	0.19	1.29	0.23	0.66	0.10	0.71	0.11	7.00	75.55	70.66	4.89	14.45	19.09	1.82	30.74	0.85
G24	8.98	12.10	1.65	6.00	1.12	0.23	1.01	0.14	0.92	0.17	0.52	0.08	0.52	0.07	6.30	33.52	30.09	3.43	8.77	11.64	1.57	37.41	0.76
G25	17.90	27.10	3.58	12.30	1.99	0.34	1.72	0.25	1.41	0.27	0.78	0.12	0.82	0.11	8.90	68.69	63.21	5.48	11.53	14.72	1.69	33.30	0.81
G26	9.92	13.60	2.02	7.90	1.62	0.41	1.59	0.24	1.51	0.30	0.84	0.12	0.82	0.11	11.20	41.01	35.48	5.53	6.42	8.16	1.56	37.33	0.73
G27	8.55	16.10	1.96	7.40	1.25	0.14	0.98	0.13	0.72	0.13	0.33	0.05	0.38	0.05	3.50	38.24	35.47	2.77	12.81	15.17	2.08	27.31	0.95
G28	12.10	18.00	2.47	8.90	1.72	0.47	1.61	0.21	1.25	0.23	0.58	0.08	0.58	0.08	7.80	48.28	43.66	4.62	9.45	14.07	2.24	34.04	0.79
G29	15.30	24.50	2.96	10.10	1.49	0.20	1.13	0.17	1.03	0.20	0.60	0.10	0.67	0.10	5.50	58.55	54.55	4.00	13.64	15.40	1.36	27.70	0.88
G30	17.80	28.50	3.57	12.50	2.04	0.32	1.68	0.23	1.26	0.23	0.66	0.10	0.68	0.10	7.10	69.67	64.73	4.94	13.10	17.65	1.99	30.87	0.86
G31	23.80	32.90	4.74	17.50	3.17	0.73	3.08	0.41	2.45	0.46	1.26	0.19	1.14	0.17	16.40	92.00	82.84	9.16	9.04	14.08	2.18	35.65	0.75
G32	29.40	44.00	6.04	21.40	3.59	0.66	2.93	0.44	2.79	0.49	1.45	0.22	1.54	0.22	15.00	115.17	105.09	10.08	10.43	12.87	1.54	30.61	0.79
G33	27.10	38.80	5.43	18.30	3.34	0.65	2.94	0.43	2.53	0.48	1.42	0.22	1.47	0.20	14.50	103.31	93.62	9.69	9.66	12.43	1.61	30.21	0.77
G34	61.30	77.10	10.70	35.60	1.12	0.20	3.76	0.49	3.03	0.61	1.70	0.31	1.99	0.27	18.50	198.18	186.02	12.16	15.30	20.77	1.52	30.33	0.72
G35	51.00	46.90	12.10	52.10	9.37	1.53	13.70	1.99	13.40	3.10	9.91	1.60	10.80	1.64	120.00	229.14	173.00	56.14	3.08	3.18	1.02	38.71	0.45
G36	114.00	85.10	26.10	115.00	23.90	4.69	35.30	5.44	35.80	8.15	24.90	3.77	23.90	3.57	348.00	509.62	368.79	140.83	2.62	3.22	1.19	42.70	0.38

Table 2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

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Geochemical features and organic matter enrichment in the Early Cambrian black shale, northern Jiangsu area

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