鄂西黄陵背斜南缘下寒武统牛蹄塘组一段古沉积环境演化特征——以秭地1井为例

许露露; 温雅茹; 周向辉; 居字龙; 陈威; 杨洁; 任志军; 文剑航

doi:10.11781/sysydz202203456

鄂西黄陵背斜南缘下寒武统牛蹄塘组一段古沉积环境演化特征——以秭地1井为例

doi: 10.11781/sysydz202203456

许露露^{1, 2,},
温雅茹^{1, 2, ,},
周向辉¹,
居字龙¹,
陈威¹,
杨洁¹,
任志军¹,
文剑航¹

1.
湖北省地质调查院, 武汉 430034
2.
湖北省地质勘查工程技术研究中心, 武汉 430034

基金项目:

湖北省自然资源厅科研项目"鄂西地区下古生界页岩气储层物性特征及差异富气机理研究" ZRZY2020KJ10

湖北省地质调查院科研项目"鄂西地区中下寒武统海相碳酸盐岩含油气性研究" KJ2022-50

详细信息

作者简介:
许露露(1985-), 男, 高级工程师, 从事页岩气地质调查及储层评价研究工作。E-mail: xulu19850806@126.com

通讯作者:
温雅茹(1986-), 女, 高级工程师, 从事油气地质及页岩气调查评价工作。E-mail: wenyaru2013@163.com

中图分类号: TE121.3
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出版历程
- 收稿日期: 2021-06-28
- 修回日期: 2022-04-07
- 刊出日期: 2022-05-28

Paleo-environment of the first member of Niutitang Formation on the southern margin of Huangling anticline, western Hubei province: a case study of well ZD-1

XU Lulu^{1, 2
,},
WEN Yaru^{1, 2
, ,},
ZHOU Xianghui¹,
JU Zilong¹,
CHEN Wei¹,
YANG Jie¹,
REN Zhijun¹,
WEN Jianhang¹

1.
Hubei Geological Survey, Wuhan, Hubei 430034, China
2.
Hubei Research Center of Geological Exploration and Engineering Technology, Wuhan, Hubei 430034, China

摘要

摘要: 下寒武统牛蹄塘组为鄂西地区重要的页岩气勘探目的层之一，针对牛蹄塘组一段(Ꞓ₁n¹，简称牛一段)古沉积环境研究较为薄弱的现状，对宜昌黄陵背斜南缘秭地1井牛一段的古气候、古氧化还原条件及古生产力等沉积环境演化特征进行了综合分析，并建立了沉积环境演化模式图。与贫有机质层段相比，富有机质层段TOC含量高，SiO₂含量更高，而CaO含量更低。U、V、Ni、Zn、Cu更为富集。化学蚀变指数(CIA)显示牛蹄塘组一段总体处于中等风化强度，富有机质层段气候温暖湿润，且地层往上气候变得炎热潮湿。由底到顶，牛一段主要经历了富有机质层段下部厌氧到富有机质层段上部缺氧再到贫有机质层段含氧3个阶段。总体上，研究区处于弱滞留—中等滞留盆地，富有机质层段由于Mo含量更高而滞留程度更高。富有机质层段具有更高的古生产力，且存在古生产力快速下降的2个时期，这与海平面下降导致水体由厌氧转化为氧化有直接关系。根据古气候、古氧化还原条件和古生产力特征可将研究区牛一段划分为3个演化阶段。
- 古沉积环境 /
- 页岩 /
- 黄陵背斜 /
- 牛蹄塘组 /
- 下寒武统 /
- 鄂西
Abstract: The Lower Cambrian Niutitang Formation is one of the important targets for shale gas exploration in the western Hubei province. In view of the relatively weak research on the paleo-sedimentary environment of the 1st member of Niutitang Formation (Ꞓ₁n¹), the paleo-climate, paleo-redox conditions and paleo-productivity of the Ꞓ₁n¹ were comprehensively studied based on data collected from well ZD-1 on the southern margin of the Huangling anticline in Yichang area, and a model of the evolution of sedimentary environment was proposed. Compared with the organic-poor strata, the organic-rich strata have higher TOC content, much higher SiO₂, U, V, Ni, Zn and Cu contents, and lower CaO content. The chemical index of alteration (CIA) shows that the Ꞓ₁n¹ has experienced weathering effect of moderate intensity. The climate was warm and humid when the organic-rich layers deposited, and became hot and wet when the upper layers deposited. The redox conditions of Ꞓ₁n¹ have experienced 3 stages, including euxinic in the lower part of organic-rich strata, dysoxic in the upper part of organic-rich strata, and oxic in organic-poor strata. In general, the study area developed in a weak-medium retention basin. The ratio of Mo_EF/U_EF is usually 1-3 times than that of normal seawater due to the high content of Mo, showing much higher retention rate. The organic-rich strata have higher paleo-productivity, and there are 2 periods of rapid decline of paleo-productivity, which is directly related to the change of water from anaerobic to oxidized due to the decrease of sea level. According to paleo-climate, paleo-redox conditions and paleo-productivity characteristics, the Ꞓ₁n¹ can be divided into 3 evolution stages.
- paleo-environment /
- shale /
- Huangling anticline /
- Niutitang Formation /
- Lower Cambrian /
- western Hubei

HTML全文

图 1 鄂西地区黄陵背斜南缘秭地1井沉积环境及岩性柱状图

图 1a修改自参考文献[12]，图 1b引自参考文献[13-14]

Figure 1. Geological setting (a, b) and stratigraphic column (c) of well ZD-1 on the southern margin of Huangling anticline, western Hubei

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图 2 鄂西地区黄陵背斜南缘秭地1井下寒武统牛一段纵向上TOC含量和样品位置分布

Figure 2. Vertical distribution of TOC and samples of Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

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图 3 鄂西地区黄陵背斜南缘秭地1井下寒武统牛蹄塘组一段主量元素三角图

Figure 3. Ternary diagram of major elements of samples from Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

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图 4 鄂西地区黄陵背斜南缘秭地1井下寒武统牛蹄塘组一段富有机质及贫有机质页岩主量及微量元素富集系数

Figure 4. Enrichment factors of major and trace elements of organic-rich and organic-poor shale samples from Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

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图 5 鄂西地区黄陵背斜秭南缘地1井下寒武统牛蹄塘组一段样品A-CN-K三角图

Figure 5. A-CN-K ternary diagram for samples from Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

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图 6 鄂西地区黄陵背斜南缘秭地1井下寒武统牛蹄塘组一段氧化还原环境、古生产力分布

Figure 6. Redox environment and paleoproductivity distribution of samples from Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

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图 7 鄂西地区黄陵背斜南缘宜地2井牛一段U_EF—Mo_EF协变模式及Mo—TOC相关性

数据源自参考文献[11]。

Figure 7. U_EF-Mo_EF covariation and TOC vs. Mo_EF scatter plots for samples from Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

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图 8 鄂西地区黄陵背斜南缘下寒武统牛一段沉积环境演变

Figure 8. Evolution of sedimentary environment of Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

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表 1 鄂西地区黄陵背斜南缘秭地1井样品主量元素含量统计

Table 1. Contents of major elements of samples from Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

	贫有机质样品				富有机质样品						PAAS
	Z1	Z2	Z3	Z4	Z5	Z6	Z7	Z8	Z9	Z10	PAAS
ω(TOC) /%	0.49	0.65	1.53	0.69	1.85	2.12	3.24	4.82	3.92	8.77
SiO₂/%	43.66	27.06	50.35	24.43	51.44	33.92	61.41	60.60	52.33	56.77	62.8
TiO₂/%	0.57	0.30	0.66	0.17	0.59	0.42	0.41	0.50	0.41	0.47	1
Al₂O₃/%	10.61	6.42	13.76	3.62	12.37	9.54	9.7	9.05	7.73	8.13	18.9
Fe₂O₃/%	4.53	2.66	4.99	2.06	4.69	3.43	3.79	2.73	3.39	2.81	7.22
MnO/%	0.07	0.03	0.04	0.04	0.04	0.04	0.03	0.04	0.07	0.02	0.11
MgO/%	1.56	1.06	2.15	1.35	2.03	2.53	1.57	1.25	3.37	1.37	2.2
CaO/%	16.87	31.10	9.11	35.34	10.35	21.28	5.32	6.96	10.07	7.07	1.3
Na₂O/%	1.11	0.69	1.01	0.50	1.04	0.78	1.27	0.99	0.90	0.72	1.2
K₂O/%	2.26	1.34	3.11	0.69	2.64	2.09	2.08	2.94	2.64	3.41	3.7
P₂O₅/%	0.15	0.2	0.19	0.07	0.18	0.09	0.12	0.14	0.15	0.20	0.16
Fe₂O₃/TiO₂	7.95	8.87	7.56	12.12	7.95	8.17	9.24	5.46	8.27	5.98	7.22
Al₂O₃/(Al₂O₃+Fe₂O₃)	0.70	0.71	0.73	0.64	0.73	0.74	0.72	0.77	0.7	0.74	0.72
Al/(Al+Fe+Mn)	0.64	0.64	0.64	0.64	0.64	0.64	0.64	0.64	0.64	0.64	0.66
CIA	63.48	63.29	67.26	60.19	66.30	66.37	60.12	58.40	57.02	57.26	70.36
CIA_Corr	66.40	65.90	71.90	61.30	70.00	70.50	62.60	65.80	64.60	69.30	73.90
注：PAAS为上太古界澳大利亚页岩，数据来自于参考文献[17]; CIA为化学蚀变指数，见公式(2)；CIA_Corr为矫正后的化学蚀变指数。

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表 2 鄂西地区黄陵地区南缘秭地1井微量元素含量统计

Table 2. Contents of trace elements of samples from Ꞓ₁n¹, well ZD-1, southern margin of Huangling anticline, western Hubei

微量元素	贫有机质样品				富有机质样品						PAAS
微量元素	Z1	Z2	Z3	Z4	Z5	Z6	Z7	Z8	Z9	Z10	PAAS
Sc/10^-6	10.57	6.39	13.70	3.67	12.86	9.81	9.80	9.07	7.36	7.46	16.00
V/10^-6	96.08	64.43	124.25	44.93	173.20	86.85	798.30	247.36	74.71	963.02	150.00
Cr/10^-6	59.63	35.67	78.19	20.93	77.71	51.57	64.27	56.42	43.12	65.37	110.00
Co/10^-6	16.09	8.97	16.87	6.21	14.05	12.86	15.46	13.24	12.36	14.84	23.00
Ni/10^-6	47.79	31.93	63.77	19.31	75.77	37.41	161.27	118.32	40.89	220.18	55.00
Cu/10^-6	26.84	20.36	42.23	11.42	45.14	32.83	100.51	29.34	27.01	42.65	50.00
Zn/10^-6	63.94	47.65	101.21	35.45	118.78	65.81	135.55	100.14	9.84	291.41	85.00
Ga/10^-6	14.90	8.52	18.59	4.77	17.66	13.35	13.22	12.36	10.02	12.07
Rb/10^-6	101.21	60.54	139.73	30.64	117.35	93.51	80.14	73.51	61.43	65.96	160.00
Sr/10^-6	1 630.13	10 677.99	1 290.37	4 278.46	905.29	1 768.26	455.66	320.69	377.32	220.47	200.00
Zr/10^-6	135.15	58.86	125.13	34.77	119.98	79.53	84.82	112.71	89.82	116.55	210.00
Ba/10^-6	976.65	903.04	1 319.67	1 053.36	1 384.48	1 874.48	1 548.20	1 204.83	1 078.13	924.57	650.00
Hf/10^-6	3.64	1.62	3.38	0.91	3.20	2.22	2.25	2.99	2.45	3.03	5.00
Th/10^-6	10.30	5.57	12.40	3.29	12.04	9.16	8.09	7.06	5.79	6.67	14.60
U/10^-6	3.98	5.10	5.18	4.36	6.82	4.93	31.72	38.85	35.52	75.02	3.10
La/10^-6	32.31	17.55	36.04	11.26	36.25	27.60	22.90	22.36	21.30	24.08	38.00
Ce/10^-6	62.41	34.86	68.08	22.66	66.78	52.67	44.41	39.98	39.69	35.43	80.00
Pr/10^-6	6.97	3.96	7.71	2.53	7.65	6.06	5.24	4.53	4.48	5.05	8.90
Sr/Cu	60.73	524.51	30.55	374.69	20.05	53.86	4.53	10.93	13.97	5.17	4.00
Sr/Ba	1.67	11.82	0.98	4.06	0.65	0.94	0.29	0.27	0.35	0.24	1.67
V/Cr	1.61	1.81	1.59	2.15	2.23	1.68	12.42	4.38	1.73	14.73	1.36
U/Th	0.39	0.92	0.42	1.32	0.57	0.54	3.92	5.50	6.13	11.25	0.21
Ni/Co	2.97	3.56	3.78	3.11	5.39	2.91	10.43	8.93	3.31	14.84	2.39
Ni_xs+Cu_xs+Zn_xs	33.14	35.39	68.88	29.79	115.34	40.14	299.81	156.82	24.96	472.51
Ni/Al	8.51	9.39	8.75	10.08	11.57	7.41	31.40	24.69	9.99	51.16	5.50
δCe	0.96	0.96	0.94	0.98	0.92	0.94	0.93	0.91	0.93	0.74
注：Ni_xs+Cu_xs+Zn_xs为3个元素海洋沉积部分即生物成因的含量。

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