二叠纪中晚期地质事件对川东北富有机质页岩发育的控制

邓空; 陆扬博; 张柏林; 刘占红; 蒙冕模; 杜学斌; 陈斐然; 李飞; 陆永潮; 苟启洋; 王瀚明

doi:10.19509/j.cnki.dzkq.tb20240483

二叠纪中晚期地质事件对川东北富有机质页岩发育的控制

doi: 10.19509/j.cnki.dzkq.tb20240483

邓空^1a,,
陆扬博^1a, ,,
张柏林²,
刘占红^1b,
蒙冕模^1b,
杜学斌^1b,
陈斐然³,
李飞³,
陆永潮^1a,
苟启洋⁴,
王瀚明^1c

1a.
中国地质大学（武汉）资源学院
1b.
中国地质大学（武汉）海洋学院
1c.
中国地质大学（武汉）地质过程与矿产资源国家重点实验室，武汉 430074
2.
成都理工大学沉积地质研究院，成都 610059
3.
中国石化勘探分公司物探研究院，成都 610041
4.
中国石油大学（华东）地球科学与技术学院，山东青岛 266580

基金项目: 国家自然科学基金项目（42072137；42472201；42472197）；“地大学者”人才岗位科研启动经费（2023099）；国家重大科技专项“大型油气田及煤层气开发”（2022ZC06070001）

详细信息

作者简介:
邓空：E-mail：dengkong@cug.edu.cn

通讯作者:
E-mail：luyb@cug.edu.cn

中图分类号: P618.13
计量
- 文章访问数: 24
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-28
- 录用日期: 2024-11-08
- 修回日期: 2024-11-07
- 网络出版日期: 2025-03-21

Controls of Middle and Late Permian major geological events on the development of the organic-rich shales in northeast Sichuan Basin

1a.
China University of Geosciences (Wuhan) School of Earth Resources
1b.
China University of Geosciences (Wuhan) College of Marine Science and Technology
1c.
China University of Geosciences (Wuhan) State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430074, China
2.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
3.
Research Institute of Geophysics, Exploration Company, China Petroleum & Chemical Corporation, Chengdu 610041, China
4.
School of Geosciences, China University of Petroleum (East China), Qingdao Shandong 266580, China

More Information

Author Bio:
E-mail：dengkong@cug.edu.cn

Corresponding author: E-mail：luyb@cug.edu.cn

摘要

摘要:
川东北地区二叠系大隆组、吴家坪组和茅口组中3套黑色富有机质页岩获页岩气勘探的重大发现，开辟了接替五峰组−龙一段海相页岩气勘探开发的新领域。基于岩石学、沉积学和地球化学分析，探讨了这3套黑色富有机质页岩的沉积特征及其沉积古环境的演化过程，综合分析了川东北地区二叠纪中晚期富有机质页岩沉积时期的古环境差异及有机质富集的控制因素。结果表明，茅口组、吴家坪组及大隆组富有机质页岩具有强烈的非均质性，其发育控制因素也存在显著差异。其中，茅口组三段沉积期受强上升流、弱火山和弱热液活动影响，气候温暖湿润，伴随有极高的初级生产力、低陆源输入及缺氧硫化的水体条件；吴家坪组二段所对应的沉积环境具备高生产力、低陆源输入、季节性上升流、弱热液活动及间隙硫化−硫化条件的特征；大隆组受强热液、上升流和岛弧火山的影响，其所对应的沉积环境具有高初级生产力、低陆源输入及间隙硫化−硫化条件的特征。研究结果进一步揭示了多重地质事件对富有机质页岩的复杂耦合作用，构建了多重地质事件联控的富有机质页岩成因模式，为海相页岩气勘探有利区提供了理论依据及模型支持。
- 地质事件 /
- 成因模式 /
- 上扬子地区 /
- 大隆组 /
- 吴家坪组 /
- 茅口组 /
- 富有机质页岩 /
- 二叠纪
Abstract: Objective
Three sets of black organic-rich shales found in the Permian Dalong Formation, Wujiaping Formation, and Maokou Formation in northeastern Sichuan have yielded significant discoveries in shale gas exploration, presenting new opportunities beyond the established Wufeng-Longmaxi marine shale gas plays.
Methods
This study investigated the lithological characteristics and paleoenvironmental evolution of these formations through petrological and geochemical analyses. A comprehensive examination of the depositional environments and the key controlling factors for organic matter enrichment during the deposition of these organic-rich black shales from the Middle to Late Permian in northeastern Sichuan has been performed.
Results
The findings demonstrate that the three organic-rich shales exhibit considerable heterogeneity, with distinct controlling factors influencing their development. The sedimentary period of the third member of the Maomao Formation was characterized by strong upwelling, weak volcanic activity, and limited hydrothermal activities. This environment featured a warm and humid climate, extremely high primary productivity, low terrestrial input, and anoxic sulfide water conditions. In contrast, the sedimentary environment of the second member of the Wujiaping Formation was marked by high productivity, low continental source input, seasonal upwelling, weak hydrothermal activity, and interstitial sulfidation-sulfidation conditions and driven by strong hydrothermal fluid, upwelling, and island arc volcanic activity. The sedimentary environment of the Dalong Formation also exhibited high primary productivity, low terrestrial input, and interstitial sulfidation-sulfidation conditions.
Conclusion
The research highlights the complex interactions of multiple geological events on organic-rich shales and constructs a genetic model for these shales influenced by various geological factors. This model provides a theoretical basis and supports the identification of favorable areas for marine shale gas exploration.
- geological event /
- genetic model /
- Upper Yangtze area /
- Dalong Formation /
- Wujiaping Formation /
- Maokou Formation /
- organic-rich shale /
- Permian

HTML全文

图 1 二叠纪中晚期全球重大生物演化和地质作用事件

SLIP. 西伯利亚大火成岩省；ELIP. 峨眉山大火成岩省，改自文献[12]；大气CO₂浓度：1 ppmv=2.86 mg/m³

Figure 1. Key stages of biological evolution stages and significant geological events during the Mid-Late Permian

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图 2 研究区吴家坪组古地理背景图和重点井位(a)及关键层位岩性柱状图(b)

Figure 2. Paleogeographic map of the study area, location of the study drill-core (a) and lithological column of the organic-rich strata (b)

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图 3 LY-1井茅口组−大隆组的代表性样品矿物学成分

Figure 3. Mineralogical composition of representative samples from the Maokou Formation and Dalong Formation in Well LY-1

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图 4 LY-1井茅口组−大隆组主要岩相类型序列、火山活动喷发期次及凝灰岩分布特征

D1-2，D3-5，D6，D7-22，W1-99. 不同层的火山灰编号

Figure 4. Main lithofacies types and sequences, volcanic eruption periods and distribution characteristics of tuffaceous rocks in the Maokou Formation and Dalong Formation of Well LY-1

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图 5 LY-1井茅口组−大隆组页岩岩心及镜下特征照

a，b. 大隆组含灰硅质页岩，见大量麻点状石膏；c. 富有机质硅质页岩，见大量放射虫定向排列（单偏光）；d. 富有机质硅质页岩，见黄铁矿及放射虫散乱分布（单偏光）；e. 含灰硅质页岩，见白云石及石英散乱分布（单偏光）；f. 富有机质硅质页岩，见放射虫散乱分布，局部可见被溶蚀；g. 吴二段硅质页岩，见放射虫散乱分布（单偏光）；h. 富有机质灰质页岩，见白云质胶结（单偏光）；i. 含黏土质灰质页岩，见海百合分布（单偏光）；j. 石英及白云质胶结（单偏光）；k. 吴一段凝灰岩含有火山碎屑和火山尘；l. 茅口组硅质页岩和硅质泥岩；m～p. 吴一段凝灰岩，脱玻化作用下的不均匀斑团级形成的微晶长石及石英，见大量碎屑及溶蚀孔分布（单偏光）；q～t. 见大量放射虫分布、石英溶蚀胶结及白云质胶结（单偏光）

Figure 5. Shale core and microscopic characteristics of the Maokou Formation and Dalong Formation in Well LY-1

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图 6 主微量元素分布图

Figure 6. Distribution of major and trace elements

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图 7 LY-1井火山活动、热液活动、上升流、初级生产力、氧化还原条件及其古气候的指标

Figure 7. Geochemical proxies related to volcanism, hydrothermal activitiy, upwelling, primary productivity, redox conditions, and CIA in Well LY-1

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图 8 研究区二叠纪中晚期火山活动演化期次

a. Th/Nb−Hf元素构造环境图解；b. Hf/Th−Th/Nb及Nb/Hf−Th/U构造环境图解；c. 二叠纪中晚期各组火山活动演变模式图；上寺剖面、朝天剖面、煤山剖面和猫儿山剖面数据引用HUANG等^[35]、ZHONG等^[36]和张晗等^[39]；峨眉山玄武岩数据引用HUANG等^[35]、ZHONG等^[36]、杨凤英等^[37]和CHENG等^[38]

Figure 8. Evolutionary stages of volcanism in the study area during the Mid-Late Permian

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图 9 LY-1井茅口组−大隆组汞（Hg）元素与总有机碳（TOC）相关性分析图

Figure 9. Correlation analysis of mercury (Hg) concentrations and total organic carbon (TOC) in the Maokou Formation and Dalong Formation of Well LY-1

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图 10 地球化学指标交会图

RS. 红海金属沉积物；EPS. 太平洋隆起含金属沉积物；CU. 金属沉积物；PC. 太平洋深海沉积物；UC. 陆源沉积物；SW. 海水

Figure 10. Cross-plots of geochemical proxies

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图 11 二叠纪中晚期川东北地区富有机质页岩沉积环境、演化模式及有机质富集控制因素

Figure 11. Depositional environment, evolution model and controlling factors of organic matter enrichment in the organic-rich shales of the northeast Sichuan Basin during Middle and Late Permian

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