上奥陶统五峰组海底麻坑沉积的首次识别及其地质意义<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2024.02.019

古地理学报 ›› 2024, Vol. 26 ›› Issue (2): 255-268. doi: 10.7605/gdlxb.2024.02.019

• 岩相古地理学及沉积学 • 下一篇

上奥陶统五峰组海底麻坑沉积的首次识别及其地质意义^*

时志强^1,2, 彭深远¹, 赵子腾¹

1 成都理工大学沉积地质研究院,四川成都 610059;
2 成都理工大学油气藏地质及开发工程国家重点实验室,四川成都 610059

收稿日期:2023-10-13 修回日期:2023-12-02 出版日期:2024-04-01 发布日期:2024-04-03
作者简介:时志强,男,1972年生,教授,主要从事沉积学研究。E-mail: szqcdut@163.com。
基金资助:
*四川省科技计划项目(编号: 2021YJ0353)和国家自然科学基金(编号: 41272131)联合资助

First identification and its geological significance of seafloor pockmarks sediments in the Upper Ordovician Wufeng Formation in China

SHI Zhiqiang^1,2, PENG Shenyuan¹, ZHAO Ziteng¹

1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;
2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China

Received:2023-10-13 Revised:2023-12-02 Online:2024-04-01 Published:2024-04-03
About author:SHI Zhiqiang,born in 1972,professor,is mainly engaged in research on sedimentology. E-mail: szqcdut@163.com.
Supported by:
Co-funded by Science and Tectnology Planning Project,Sichuan Province(No.2021YJ0353)and National Natural Science Foundation of China(No.41272131)

摘要/Abstract

摘要： 尽管海底麻坑普遍发育在现代海洋的多种环境,但关于深时、特别是古生代麻坑沉积的研究却极为罕见,研究者对其特征、成因、鉴别标志所知甚少。本次研究在重庆石柱地区柑子坪及歇步头剖面识别了发育在上奥陶统五峰组暗色细粒岩中的海底麻坑沉积,在野外观察、采样的基础上,利用显微薄片及扫描电镜观察了其微观特征,并测试了麻坑与围岩的主量元素和微量元素。研究显示麻坑沉积总体呈楔状或顶平底凹的透镜状,麻坑内岩层紊乱并发育上拱的岩层,被硅质脉分割的角砾普遍发育,麻坑沉积中常见重晶石、沥青及赤铁矿,主量及稀土元素测试结果显示麻坑的形成可能与热液及冷泉无关,推测五峰组自生的低熟油气是麻坑形成的基础。总结认为深时麻坑的识别标志有: 地震剖面的负地形形态、碳同位素负偏明显的不规则形态的碳酸盐岩岩体、楔状或透镜状宏观形态、麻坑内杂乱的沉积填充、局部地层的上拱形态及古生物化石显示的沉积间断或时序混乱等。五峰组海底麻坑沉积具岩石学、地层学、古环境及油气地质学意义。

关键词: 海底麻坑, 细粒岩, 五峰组, 奥陶系, 四川盆地

Abstract: Seafloor pockmarks are commonly seen in various marine environments. The study on the pockmark sediments,however,have been hardly involved in the literature,causing few knowledges of their characteristics,origin and identification. In this study,we recognized the pockmark sediments from the Paleozoic fine-grained rocks for the first time in China. Based on the field observations and sampling of Upper Ordovician Wufeng Formation at Ganziping and Xiebutou in Shizhu,Chongqing,we tested pockmark rocks with microscope,scanning electron microscope(SEM),and major and trace element analyses. We found the bed chaos and arched beds in the lentoid or cuneal pockmark sediment body. Breccia carved by siliceous veins,are commonly seen,together with asphalt and barite,hematite minerals in the pockmark sediments. Observations and results of major element and REE suggest that the formation of pockmarks were unrelated with hydrothermal liquid and cold seeps. All the geological facts indicate the low-matured oil and gas generated from the Wufeng Formation as the first essential for the formation of pockmarks. The identification marks of deep-time pockmarks are thought as: (i)negative relief in seismic sections,(ii)lentoid or cuneal sediment body,(iii)chaos beds,(iv)arched beds,and(v)hiatus and temporal chaos of sediments. Meanwhile,petrological,stratigraphical,paleoenvironmental and petrogeological significances of the pockmarks in the Wufeng Formation are discussed in this study.

Key words: seafloor pockmarks, fine-grained rocks, Wufeng Formation, Ordovician, Sichuan Basin

中图分类号:

P512.2

时志强, 彭深远, 赵子腾. 上奥陶统五峰组海底麻坑沉积的首次识别及其地质意义^*[J]. 古地理学报, 2024, 26(2): 255-268.

SHI Zhiqiang, PENG Shenyuan, ZHAO Ziteng. First identification and its geological significance of seafloor pockmarks sediments in the Upper Ordovician Wufeng Formation in China[J]. JOPC, 2024, 26(2): 255-268.

http://www.gdlxb.cn/CN/Y2024/V26/I2/255

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上奥陶统五峰组海底麻坑沉积的首次识别及其地质意义^*

First identification and its geological significance of seafloor pockmarks sediments in the Upper Ordovician Wufeng Formation in China

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上奥陶统五峰组海底麻坑沉积的首次识别及其地质意义*

First identification and its geological significance of seafloor pockmarks sediments in the Upper Ordovician Wufeng Formation in China

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上奥陶统五峰组海底麻坑沉积的首次识别及其地质意义^*