|本期目录/Table of Contents|

[1]曹光耀,刘 宇*,周小琳,等.川西南地区五峰组—龙马溪组沉积环境及有机质富集模式[J].地球科学与环境学报,2023,45(05):1227-1245.[doi:10.19814/j.jese.2022.11040]
 CAO Guang-yao,LIU Yu*,ZHOU Xiao-lin,et al.Sedimentary Environment and Accumulation Pattern of Organic Matter in Wufeng-Longmaxi Formations in the Southwestern Sichuan, China[J].Journal of Earth Sciences and Environment,2023,45(05):1227-1245.[doi:10.19814/j.jese.2022.11040]
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第45卷
期数:
2023年第05期
页码:
1227-1245
栏目:
庆贺汤中立院士从事地质工作七十周年专辑
出版日期:
2023-09-15

文章信息/Info

Title:
Sedimentary Environment and Accumulation Pattern of Organic Matter in Wufeng-Longmaxi Formations in the Southwestern Sichuan, China
文章编号:
1672-6561(2023)05-1227-19
作者:
曹光耀12刘 宇123*周小琳456李源春12
(1. 成都理工大学 沉积地质研究院,四川 成都 610059; 2. 成都理工大学 沉积与生物地球化学国际研究中心,四川 成都 610059; 3. 成都理工大学 油气藏地质及开发工程国家重点实验室,四川 成都 610059; 4. 中国地质调查局成都地质调查中心,四川 成都 610081; 5. 自然资源部沉积盆地与油气资源重点实验室,四川 成都 610081; 6. 中国地质调查局沉积地质研究中心,四川 成都 610081)
Author(s):
CAO Guang-yao12 LIU Yu123* ZHOU Xiao-lin456 LI Yuan-chun12
(1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. International Center for Sedimentary Geochemistry and Biogeochemistry Research, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 3. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 4. Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China; 5. Key Laboratory of Sedimentary Basin and Oil and Gas Resources of Ministry of Natural Resources, Chengdu 610081, Sichuan, China; 6. Sedimentary Geology Research Center, China Geological Survey, Chengdu 610081, Sichuan, China)
关键词:
古海洋 沉积环境 黑色页岩 五峰组 龙马溪组 氧化-还原条件 有机质富集 四川
Keywords:
paleo-ocean sedimentary environment black shale Wufeng Formation Longmaxi Formation redox condition organic matter accumulation Sichuan
分类号:
P595; P618.13
DOI:
10.19814/j.jese.2022.11040
文献标志码:
A
摘要:
为了明确川西南地区五峰组—龙马溪组富有机质页岩的沉积环境演化特征及有机质主控因素,充分利用元素地球化学和有机地球化学方法,获得了YD1井五峰组—龙马溪组总有机碳(TOC)、主量和微量元素含量纵向变化特征,探讨了五峰组—龙马溪组古环境演化特征及有机质富集机制。结果表明:龙马溪组总有机碳(平均值为4.50%)整体高于五峰组(平均值为1.26%); 地球化学指标V/Cr值、Corg/P值、Mo含量及Mo/TOC值表明,五峰组—龙马溪组沉积期,沉积环境处于中等—强的局限程度,同时海水经历了氧化—次氧化(五峰组V/Cr平均值为3.39,Corg/P平均值为138.16,Mo平均含量为4.28×10-6)向缺氧硫化(龙马溪组V/Cr平均值为6.71,Corg/P平均值为249.38,Mo平均含量为61.49×10-6)的变化过程; 古生产力指标Ni含量、(Ni+Cu)/Al值、Babio含量指示五峰组—龙马溪组均具有相对较高的生产力水平,这主要归因于同期频繁火山活动引起的丰富营养物质的输入以及上升流的发育。总有机碳与陆源输入指标、氧化-还原指标、古生产力指标相关性分析发现:五峰组和龙马溪组有机质富集主要受控于沉积环境的氧化-还原条件; 氧化—次氧化的水体环境抑制了五峰组有机质的保存; 强烈的缺氧条件及较高的生产力水平共同促成龙马溪组较高的有机质含量,使得龙马溪组更加有利于页岩气开发。
Abstract:
In order to find the evolution characteristic of sedimentary environment and main controlling factors of organic matter in Wufeng-Longmaxi Formations organic-rich shale in the southwestern Sichuan, the vertical variations of total organic carbon(TOC), and contents of major and trace elements in Wufeng-Longmaxi Formations in well YD1 were obtained by element geochemistry and organic geochemistry; and the paleo-environment evolution characteristic and organic matter accumulation mechanism of Wufeng-Longmaxi Formations were discussed. The results show that TOC of Longmaxi Formation with the average of 4.50% is higher than that of Wufeng Formation with the average of 1.26%. The geochemical indices(V/Cr, Corg/P, Mo content and Mo/TOC)indicate that the sedimentary environment of Wufeng-Longmaxi Formation is in a moderate to strong limitation, and the seawater undergoes from oxic-suboxic(the averages of V/Cr, Corg/P and Mo content of Wufeng Formation are 3.39, 138.16 and 4.28×10-6)to anoxic sulfide(the averages of V/Cr, Corg/P and Mo content of Longmaxi Formation are 6.71, 249.38 and 61.49×10-6). The paleoproductivity indices((Ni+Cu)/Al and contents of Ni and Babio)indicate that Wufeng-Longmaxi Formations have relatively high productivity levels, which is mainly attributed to the input of rich nutrients caused by frequent volcanic activities and the development of upwelling in the same period. According to the correlation analysis of TOC with continental input indices, redox indices and paleoproductivity indices, it is found that the organic matter accumulation of Wufeng and Longmaxi Formations are controlled by the redox conditions; organic preservation of Wufeng Formation is suppressed by oxic-suboxic condition; intense anoxic condition and high productivity contribute to the high organic matter content, making Longmaxi Formation conducive to shale gas development.

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备注/Memo

备注/Memo:
收稿日期:2022-11-11; 修回日期:2023-01-01投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(42102142)
作者简介:曹光耀(1998-),男,山东枣庄人,理学硕士研究生,E-mail:caoguangyao98@163.com。
*通讯作者:刘 宇(1985-),男,福建邵武人,副教授,理学博士,E-mail:Liuyu17@cdut.edu.cn。
更新日期/Last Update: 2023-10-15