鄂尔多斯盆地东部本溪组一段泥页岩元素地球化学特征

doi:10.11764/j.issn.1672-1926.2021.12.009

Abstract

Abstract:

The Carboniferous Benxi Formation shale is an important target interval for shale gas exploration in the Upper Paleozoic in the central and eastern Ordos Basin. On the basis of its representative field profile， drilling core system observation and sampling analysis， using the analyticaldata of major and trace elements， combined with the test data of the whole rock mineral composition， organic carbon content， organic microscopic composition， and so on， the palaeoclimate， water environment and the relationship with the development of organic-rich mud shale during the sedimentary period of the First Member of Benxi Formation in the eastern Ordos Basin are studied. The results show that the shale in the First Member of Benxi Formation of the study area is mainly clayey shale and siliceous shale， and quartz and clay minerals are absolutely dominant in the mineral composition； the CIA， Sr/Cu， and C value parameters indicate that the sedimentary period of the first member is mainly hot characteristics of wet paleoclimate； Sr content， Sr/Ba， Ba/Ga and other parameters indicate that the salinity of the sedimentary water in the upper and lower sub-members of the member is saline water， saline water-brass water， respectively，indicating that the water body salt in the late depositional period of this member was at relatively high degree；V/（V+Ni），Ce_anom，Th/U and other parameters indicate that the water body in this sedimentary period was dominated by anoxic-poor oxygen environment. The hot and humid paleo-climate， the saline anoxic-poor sedimentary water environment and other good organic matter preservation conditions are favorable factors for the development of organic-rich shale in this section， especially the upper subsection. The development of high-quality shale provides a good foundation for shale gas exploration in the study area.

Key words: Element geochemistry, Organic-rich shale, Benxi Formation, Sedimentary environment, Paleoclimate, Ordos Basin.

CLC Number:

TE122.1⁺13

Chenguang CUI,Hui ZHANG,Wenxiang LIU,Shifang LI,Yan LIU,Huanxin SONG,Chenjun WU,Zhigang WEN. Element geochemical characteristics of shale in the First Member of Benxi Formation in eastern Ordos Basin： Take Zhaoxian section and Well M115 in Linxian County， Shanxi as examples[J].Natural Gas Geoscience, 2022, 33(6): 1001-1012.

Figures/Tables 10

Fig.1

Fig.2

Fig.3

Fig.4

Table 1

Test results of element content analysis in the First Member of Benxi Formation"

编号	层位	SiO₂/%	Al₂O₃/%	微量元素/10^-6								Sr/Ba	Ba/Ga	V/ （V+Ni）	Ce_anom	Th/U	CIA	Sr/Cu	C值	P/Ti	TOC/%
编号	层位	SiO₂/%	Al₂O₃/%	Sr	V	Ni	Ba	Cu	Mo	Ga	Th	Sr/Ba	Ba/Ga	V/ （V+Ni）	Ce_anom	Th/U	CIA	Sr/Cu	C值	P/Ti	TOC/%
Z-S12	招贤剖面C₂b_1?^上	57.39	24.23	217.26	95.93	12.88	169.32	13.41	0.47	31.04	20.57	1.28	5.45	0.88	-0.03	4.94	91.30	16.20	0.73	0.11	2.93
Z-S11		59.46	24.01	222.63	96.24	9.14	190.31	8.33	0.45	31.48	20.38	1.17	6.05	0.91	-0.05	4.86	91.06	26.73	0.31	0.09	2.29
Z-S10		56.27	21.29	193.25	91.81	52.91	148.53	19.83	0.62	26.88	15.74	1.30	5.53	0.63	-0.02	3.82	91.74	9.75	2.54	0.16	2.25
Z-S9		48.10	17.11	298.55	81.22	26.90	202.87	12.72	0.94	24.34	17.16	1.47	8.34	0.75	-0.04	4.54	90.00	23.47	1.12	0.16	1.62
Z-S8		58.05	22.77	270.02	94.04	22.58	167.83	22.61	0.50	31.10	20.40	1.61	5.40	0.81	-0.06	4.98	91.42	11.94	0.79	0.13	2.98
Z-S7		59.02	24.14	222.90	96.23	52.34	187.36	23.38	0.49	29.41	18.60	1.19	6.37	0.65	-0.04	3.38	91.38	9.53	0.36	0.17	2.03
Z-S6		55.56	21.66	339.26	68.78	11.14	3648.07	14.87	0.57	33.65	17.44	0.09	108.42	0.86	-0.07	3.21	90.17	22.82	0.35	0.14	12
Z-S5	招贤剖面C₂b₁^下	57.98	20.47	149.25	134.39	57.61	289.23	28.04	0.43	27.77	17.82	0.52	10.42	0.70	-0.05	4.54	83.52	5.32	1.38	0.10	1.97
Z-S4		61.55	22.31	184.10	167.13	10.49	336.66	12.91	0.72	32.76	22.25	0.55	10.28	0.94	-0.02	3.44	82.63	14.26	0.24	0.08	1.74
Z-S3		58.54	23.75	201.47	175.50	26.01	357.14	23.02	0.23	34.39	21.80	0.56	10.38	0.87	-0.02	4.40	83.80	8.75	0.41	0.08	1.66
Z-S2		64.61	21.00	180.29	89.51	14.48	132.49	20.09	0.32	28.28	14.48	1.36	4.68	0.87	-0.04	4.57	92.17	8.97	1.28	0.14	1.26
Z-S1		47.05	35.77	34.14	99.32	34.39	45.50	4.28	1.31	36.74	6.22	0.75	1.24	0.74	-0.03	1.15	99.01	7.80	2.60	0.02	1.09
M-S9	M115井C₂b_1?^上	50.48	32.69	270.82	93.75	11.29	108.47	14.17	0.39	43.36	20.75	2.50	2.50	0.89	-0.02	4.97	97.06	19.12	1.08	0.07	1.01
M-S8		47.75	17.98	403.32	168.82	26.85	250.11	17.99	2.90	26.86	14.46	1.61	9.31	0.86	-0.03	1.98	86.97	22.42	2.04	1.56	1.44
M-S7		60.23	24.45	88.54	199.45	22.68	281.2	25.48	0.42	33.89	17.94	0.31	8.30	0.90	-0.04	3.44	88.68	3.47	0.22	0.08	1.42
M-S6		46.03	28.06	354.52	207.49	86.45	188.57	81.31	1.02	36.84	21.35	1.88	5.12	0.71	-0.01	2.26	93.74	4.36	1.61	0.15	5.33
M-S5	M115井C₂b_1?^下	58.40	20.39	203.99	133.65	22.37	318.89	26.61	0.35	28.37	17.54	0.64	11.24	0.86	-0.05	4.49	85.60	7.67	1.15	0.12	2.57
M-S4		64.22	20.06	75.27	202.86	28.4	351.14	22.16	0.19	33.04	20.28	0.21	10.63	0.88	-0.03	3.56	83.65	3.40	0.15	0.09	0.83
M-S3		53.53	29.62	339.09	144.74	55.25	190.24	33.65	0.48	34.08	34.66	1.78	5.58	0.72	0.00	3.46	93.19	10.08	0.58	0.12	0.81
M-S2		47.63	34.55	138.09	94.62	21.56	91.15	5.67	1.48	48.48	8.73	1.51	1.88	0.81	-0.18	0.69	97.49	24.35	1.15	0.03	0.46
M-S1		49.93	34.11	221.73	108.88	39.27	180.15	4.7	0.32	41.72	20.07	1.23	4.32	0.73	-0.04	3.49	94.85	47.18	0.13	0.03	0.67

Table 1

Fig. 5

Fig. 6

Fig.7

Fig.8

Fig.9

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Element geochemical characteristics of shale in the First Member of Benxi Formation in eastern Ordos Basin： Take Zhaoxian section and Well M115 in Linxian County， Shanxi as examples

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