石油与天然气地质 ›› 2014, Vol. 35 ›› Issue (1): 56-64.doi: 10.11743/ogg20140108

• 层序与储层 • 上一篇    下一篇

渝东南地区下志留统石牛栏组生物礁沉积特征

谭先锋1,2, 李志军1,2, 蒋艳霞3, 李洁4, 李航2   

  1. 1. 复杂油气田勘探开发重庆市重点实验室, 重庆 404331;
    2. 重庆科技学院 石油与天然气工程学院, 重庆 401331;
    3. 成都理工大学 地球科学学院, 四川 成都 610059;
    4. 重庆地质矿产研究院 外生成矿与矿山环境重庆市重点实验室, 重庆 400042
  • 收稿日期:2013-10-09 修回日期:2013-12-24 出版日期:2014-02-08 发布日期:2014-03-26
  • 作者简介:谭先锋(1982—),男,博士、副教授,沉积地质与古环境研究。E-mail:xianfengtan8299@163.com。
  • 基金资助:
    重庆市自然科学基金项目(cstc2012jjA90007);国家自然科学基金项目(41202043)。

Sedimentary characteristics of bioherm in the Lower Silurian Shiniulan Fm, southeastern Chongqing

Tan Xianfeng1,2, Li Zhijun1,2, Jiang Yanxia3, Li Jie4, Li Hang2   

  1. 1. Chongqing Key Laboratory of Complex Oil and Gas Exploration and Development, Chongqing 401331, China;
    2. Oil and Gas Engineering Institute, Chongqing University of Science and Technology, Chongqing 401331, China;
    3. Earth Sciences Faculty, Chengdu University of Science and Technology, Chengdu, Sichuan 610059, China;
    4. Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment, Chongqing Institute of Geology and Mineral Resource, Chongqing 400042, China
  • Received:2013-10-09 Revised:2013-12-24 Online:2014-02-08 Published:2014-03-26
  • Contact: 李志军(1977—),男,博士、副教授,油气田开发地质。E-mail:lzjykj@126.com。 E-mail:lzjykj@126.com

摘要: 渝东南地区下志留统石牛栏组发育一定规模的生物礁。以重庆万盛机枪台剖面和贵州习水吼滩剖面为主要对象,利用野外观察、普通薄片、碳/氧同位素等手段,对研究区下志留统石牛栏组生物礁进行了详细研究。结果表明,研究区生物礁主要发育石牛栏组中上部,且具有一定规模;岩石结构及碳/氧同位素变化揭示了该时期海平面由缓慢上升到急剧下降的变化过程,沉积环境表现为早期浅水混积陆棚—中期生物礁滩沉积—晚期礁前斜坡沉积的演化过程,水体环境适合珊瑚礁及生物群落的大量繁殖。由此证实了渝东南地区下志留统石牛栏组生物礁发育主要受海平面变化及陆源碎屑物质注入的影响,海平面的缓慢变化是生物礁发育的基本条件,陆源碎屑物质的多少制约了生物礁的发育过程。

关键词: 生物礁, 石牛栏组, 下志留统, 渝东南地区

Abstract: A certain amount of bioherm are developed in the Lower Silurian Shiniulan Formation in southeastern Chongqing.Taking the Jiqiangtai outcrop in Wansheng of Chongqing and Houtan outcrop in Xishui of Guizhou as the main study targets,we studied in detail the bioherm in the Lower Silurian Shiniulan Formation through field observation,ordinary thin section observation and carbon/oxygen isotope measurement.The bioherms mainly occur in the Upper and Middle Shiniulan in the study area and have a certain scale.Rock structure and carbon/oxygen isotopes reveal a change of sea level from slow rising to sharp declining.Depositional environment developed from shallow mixed continental shelf in the early stage to biological reef-shoal in the middle stage and finally to reef-front slope in the late stage.The aquatic environment was suitable for the coral bioherms and biological communities to thrive.The development of bioherm in the Lower Silurian Shiniulan in southeastern Chongqing was mainly affected by sea-level changes and terrigenous clastics input.Slow change of sea level was the basic condition for bioherm growth and the amount of terrigenous clastics input controlled the process of bioherm development.

Key words: bioherm, Shiniulan Formation, Lower Silurian, southeastern Chongqing

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