云南永善－大关地区五峰组－龙马溪组黑色页岩生物地层划分与沉积环境探讨：以新地2井为例

张娣; 余谦; 陆俊泽; 王正和; 赵安坤; 刘伟; 何江林; 雷子慧

doi:10.3799/dqkx.2019.028

云南永善－大关地区五峰组－龙马溪组黑色页岩生物地层划分与沉积环境探讨：以新地2井为例

doi: 10.3799/dqkx.2019.028

张娣^1,2, ,,
余谦^1,2, , ,,
陆俊泽^1,2,
王正和^1,2,
赵安坤^1,2,
刘伟^1,2,
何江林^1,2,
雷子慧^1,3

1.
中国地质调查局成都地质调查中心, 四川成都 610082
2.
自然资源部沉积盆地与油气资源重点实验室, 四川成都 610082
3.
中国地质大学地球科学学院, 湖北武汉 430074

基金项目:

国家科技重大专项 2016ZX05034004-001

中国地质调查局能源矿产地质调查项目 DD20160176

详细信息

作者简介:
张娣(1982-), 女, 工程师, 硕士, 主要从事生物地层研究及非常规油气调查工作

通讯作者:
余谦

中图分类号: P53
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- 被引次数: 0
出版历程
- 收稿日期: 2019-01-13
- 刊出日期: 2020-03-15

Graptolite Biozonation of the Wufeng and Longmaxi Formations and Its Environmental Implications from the Xindi 2 Borehole in Yongshan-Daguan Area, NE Yunnan

Zhang Di^{1,2
,
,},
Yu Qian^{1,2
, ,
,},
Lu Junze^1,2,
Wang Zhenghe^1,2,
Zhao Ankun^1,2,
Liu Wei^1,2,
He Jianglin^1,2,
Lei Zihui^1,3

1.
Chengdu Center of China Geological Survey, Chengdu 610082, China
2.
Key Laboratory of Sedimentary Basins and Oil and Gas Resources, Ministry of Natural Resources, Chengdu 610082, China
3.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 由于缺乏对四川盆地西南缘永善-大关地区五峰组-龙马溪组生物地层的详细划分与对比，黑色页岩分布时限及其沉积背景不明确.对新地2井五峰组-龙马溪组黑色页岩岩心开展生物地层研究，识别出了从上奥陶统凯迪阶上部WF1 Dicellograptus complanatus带至志留系兰多维列统埃隆阶顶部LM8 Stimulograptus sedgwickii带的9个生物带和组合.新地2井与宁211井、焦页1井、威202井、巫溪2井黑色页岩生物地层对比结果显示，新地2井的顶界与宁211井、焦页1井黑色页岩笔石带相近，但与威202井、巫溪2井相比低了1个笔石带.结合TOC值标定，新地2井富有机质页岩沉积期为WF2-LM6笔石带，其顶界高于宁211井的LM4笔石带.在笔石生物地层框架内对比了各井黑色页岩的沉积厚度、沉积速率及TOC值，探讨了它们的沉积演化差异及构造背景.靠近古隆起或古陆的沉积区，海侵-海泛稳定期时间呈缩短的趋势，富有机质页岩上界可低至LM5笔石带或以下；远离古隆起或古陆的沉积区，富有机质页岩上界可达LM8-LM9笔石带.受沉积水体深浅差异及古隆起陆源碎屑输入的影响，威远、焦石坝及巫溪地区出现了沉积分异现象.阶段性的海退事件及古隆起的状态变化（隆升与扩大）是广西运动的构造响应.
- 永善-大关 /
- 新地2井 /
- 五峰组-龙马溪组 /
- 笔石 /
- 生物地层 /
- 沉积环境
Abstract: Due to the lack of detailed division and comparison of graptolite biozonation in Wufeng and Longmaxi formations of Yongshan-Daguan area, the distribution time of black shale and its sedimentary background are unclear. Nine graptolite biozones of the Wufeng and Longmaxi formations are recognized in the Xindi 2 borehole from the Yongshan-Daguan area, NE Yunnan in this paper. They are Dicellograptus complanatus, D. complexus, P. pacificus-M. extraordinarius, A. ascensus-P. acuminatus, C. vesiculosus, C. cyphus, D. triangulatus, L. convolutes, and S. sedgwickii biozones. A correlation of the Wufeng-Longmaxi graptolite biozones among the Xingdi 2, Ning 211, Jiaoye 1, Wei 202, and Wuxi 2 boreholes are indicated. The top of the Longmaxi black shale is diachronous, from which the top of the Longmaxi black shale of the Xindi 2, Ning 211, and Jiaoye 1 boreholes are one biozone lower than those of the Wei 202 and Wuxi 2 boreholes. High TOC content in the Longmaxi black shale is measured from WF2 (D. complexus Biozone) to LM6 (D. triangulatus Biozone) in the Xindi 2 borehole but only up to LM 5 (C. cyphus Biozone) in the Ning 211 borehole near the Central Guizhou uplift. However, the top of the Longmaxi black shale in Wei 202 and Wuxi 2 boreholes may reach to the level of LM9 (S. guerichi Biozone).According to our study, the transgression to maximum flooding period is shortened near the uplift or the old land, and the upper limit of high-quality black shale can be as low as LM5 (or below). Sedimentary differentiation occurred in Weiyuan, Jiaoshiba and Wuxi areas, which was affected by sedimentary water depth and the debris input from the uplift.
- Yongshan-Daguan area /
- Xindi 2 borehole /
- Wufeng and Longmaxi formations /
- graptolite /
- biozonation /
- sedimentary environment

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图 1 新地2井位置

Fig. 1. Location of Well Xindi 2

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图 2 扬子区奥陶纪-志留纪之交笔石带序列

WF1为Dicellograptus complanatus带；表中各带同位素年龄值均代表其底界年龄，引自Gradstein et al. (2012)和陈旭等(2015, 2018)

Fig. 2. Subdivision of the Ordovician-Silurian graptolite biozones in the Yangtze region

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图 3 新地2井五峰组-龙马溪组综合柱状图及笔石延限图

Fig. 3. Synthetic stratigraphic histogram of Wufeng and Longmaxi formations in Well Xindi 2

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图 4 新地2井五峰组和龙马溪组部分典型笔石化石

a₁. Styracograptus chiai (Mu)，2 081.04 m，WF1；a₂. Pararetiograptus sp.，2 080.94 m，WF2；a₃. Dicellograptus complexus Davies，2 080.51 m，WF2；a₄. Paraorthograptus pacificus（Ruedemann），2 080.10 m，WF3；a₅. Rectograptus songtaoensis Li，2 075.43 m；a₆. Dicellograptus ornatus Elles and Wood，2 075.03 m；a₇.Rectograptus obesus Li，2 071.53 m；a₈.Appendispinograptus supernus（Elles and Wood），2 079.22 m，WF3；b₁. Neodiplograptus anhuiensis（Li），2 067.74 m；b₂. Normalograptus mirnyensis (Obut and Sobolevskaya)，2 068.87 m；b₃. Cystograptus penna (Hopkinson)，2 043.66 m；b₄. Petalolithus latus (Barrande)，2 039.37 m；b₅. Coronograptus annellus (Li)，2 047.77 m；b₆. Stimulograptus sedgwickii (Portlock)，1 968.49 m，LM8；b₇. Dimorphograptus nanjingensis Sun，2 054.22 m；b₈. Parapetalolithus palmeus (Barrande)，1 925.44 m，LM8；b₉. Rastrites pregrinus Barrande，2 033.88 m，LM6；b₁₀. Atavograptus atavus (Jones)，2 048.17 m；b₁₁. Richardsograptus laifengensis Chen，1 988.92m；b₁₂. Coronograptus cyphus (Lopworth)，2 046.13 m；b₁₃. Paramonoclimacis chengkouensis (Ge)，1 970.20 m；b₁₄. Monograptus cf. capillaris (Carruthers)，2 046.84 m；b₁₅. Cystograptus vesiculosus（Nicholson），2 056.97 m，LM4；b₁₆. Pseudorthograptus minutus (Churkin and Carter)，2 043.66 m；b₁₇. Cystograptus penna (Hopkinson)，2 056.71 m，LM4；b₁₈. Demirastrites cf triangulatus (Harkness)，2 033.46 m；b₁₉. Avitograptus cf. avitus (Davies), 2 070.34 m；b₂₀. Coronograptus gregarius (Lopworth)，2 047.25 m；b₂₁. Richardsograptus elongatus (Churkin and Carter)，2 047.77 m；b₂₂. Lituigraptus sp.，LM7；b₂₃. Lithurgraptus cf. convolutues (Hisinger)，1 986.98 m，LM7；b₂₄. Lithurgraptus cf. convolutues（Hisinger），2 006.64 m；b₂₅. Petalolithus cf. minor Elles，2 039.47 m.图中比例尺均代表 1 mm

Fig. 4. Graptolites of the Wufeng and Longmaxi formations in Well Xindi 2

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图 5 新地2井2 069.69 m观音桥组发育的腕足类化石

Fig. 5. Hirnantia Fauna of the Guanyinqiao Formation in Well Xindi 2

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图 6 五峰组-龙马溪组黑色页岩沉积速率及有机质含量对比

Fig. 6. Deposition rate and TOC comparison of typical wells in Wufeng and Longmaxi formations

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表 1 典型井的生物地层划分及厚度、沉积速率、TOC对比

Table 1. Graptolite biozones, thickness, sedimentary rate and TOC comparison of typical wells

系	统	阶	笔石带	沉积时间 (Ma)	新地2井（本文）				宁211井（罗超等，2017）				威202井（王红岩等，2015）				焦页1井（郭旭升等，2014；Liu et al., 2017）				巫溪2井（王红岩等，2017；武瑾等，2017）
系	统	阶	笔石带	沉积时间 (Ma)	井深 (m)	厚度 (m)	沉积速率 (m/Ma)	TOC (%)	井深 (m)	厚度 (m)	沉积速率 (m/Ma)	TOC (%)	井深 (m)	厚度 (m)	沉积速率(m/Ma)	TOC (%)	井深 (m)	厚度 (m)	沉积速率 (m/Ma)	TOC (%)	井深 (m)	厚度 (m)	沉积速率 (m/Ma)	TOC (%)
志留系	兰多维列统	特列奇阶	N2		未见顶				未见顶				未见顶								未见顶
		特列奇阶	LM9/N1	0.36	1 915.50				2 180.00				2 541.63	> 6?		2.1	未见顶				1 564.2	> 53.79	> 149.42	1.80
		埃隆阶	LM8	0.27	1 968.49	52.99	196.26	0.74	2 213.16	33.16	122.81	0.55	2 546.79	5.16	19.11		2 344.19	> 44.19	> 163.67	1.43	1 599.1	34.90	129.26	2.87
			LM7	0.45	2 009.14	40.65	90.33	1.31	2 251.73	38.57	85.71	0.86	2 551.08	4.29	9.53		2 348.22	4.03	8.96	2.40	1 610.91	11.81	26.24	3.51
			LM6	1.56	2 045.67	36.53	23.42	2.76	2 313.44	61.71	39.56	1.42	2 561.6	10.52	6.74	3.7	2 367.43	19.21	12.31	1.99	1 613.86	2.95	1.89	4.49
		鲁丹阶	LM5	0.80	2 047.77	2.10	2.62	3.94	2 326.97	13.53	16.91	1.48	2 567.34	5.74	7.18	3.3	2 390.58	23.15	28.94	2.59	1 620.47	6.61	3.89	4.71
			LM4	0.90	2 056.97	9.20	10.22	5.85	2 337.21	10.24	11.38	4.50	2 571.79	4.45	1.56	4.9	2 404.27	13.69	15.21	3.66	1 620.47	6.61	3.89	4.71
			LM3	0.93	2 064.55	12.40	9.12	3.79	2 342.20	4.99	5.37	4.25					2 407.76	3.49	2.57	4.67	1 624.67	4.2	3.09	5.41
			LM2	0.43	2 069.37	12.40	9.12	3.79	2 346.33	4.13	9.60	3.69					2 407.76	3.49	2.57	4.67	1 624.67	4.2	3.09	5.41
奥陶系	上奥陶统	赫南特阶	LM1	0.60	2 070.44（?）	1.07	1.78	6.16（?）	2 349.04	2.71	4.52	6.80					2 412.10	4.34	7.23	3.22	1 628.9	4.23	7.05	5.32
		赫南特阶	WF4	0.73	2 080.1	9.66	3.73	3.51	2 351.67	2.63	3.60	5.59	2 579.6	7.81	2.45	?	2 412.52	0.42	0.16	4.85	1 629.1	0.20	0.27	6.09
		凯迪阶（上部）	WF3	1.86	2 080.1	9.66	3.73	3.51	2 353.99	2.32	1.25	3.00					2 412.52	0.42	0.16		1 636.00	6.90	2.80
			WF2	0.60	2 080.94	0.84	1.40	2.10	2 357.5	3.51	5.85	2.56					2 415.20	2.68	4.47		1 636.00	6.90	2.80
			WF1		2 081.62	0.68		1.23									2 415.36	0.16		4.95
总厚度						166.12				177.50								> 115.36				> 125.59
注：表中井深代表底界深度.

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