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现代地质 ›› 2023, Vol. 37 ›› Issue (05): 1169-1181.DOI: 10.19657/j.geoscience.1000-8527.2022.093

• 沉积学 • 上一篇    下一篇

塔里木盆地北部下寒武统肖尔布拉克组海进-海退转换背景下的微生物礁滩发育模式

陈格格1(), 高志前1(), 焦存礼2, 胡宗全2, 袁钰轩1, 卫端1, 翟昕箐1, 畅哲1   

  1. 1.中国地质大学(北京)能源学院,北京 100083
    2.中国石油化工股份有限公司石油勘探开发研究院,北京 100089
  • 收稿日期:2023-06-05 修回日期:2023-06-29 出版日期:2023-10-10 发布日期:2023-11-14
  • 通讯作者: 高志前,男,教授,博士生导师,1978年出生,矿产普查与勘探专业,主要从事碳酸盐岩层序地层学及沉积学研究。Email:gzq@cugb.edu.cn
  • 作者简介:陈格格,女,博士研究生,1997年出生,矿产普查与勘探专业,主要从事碳酸盐岩层序地层研究。Email: kbzz@qq.com
  • 基金资助:
    中国石油化工股份有限公司科技部项目(P22122);中石化西北勘探开发研究院项目(33550000-22-ZC0611-0007);国家自然科学基金项目(41972130)

Development Model of Microbial Reef-shoal in the Lower Cambrian Xiaoerbulak Formation Under Transgression-Regression Transition in the Northern Tarim Basin

CHEN Gege1(), GAO Zhiqian1(), JIAO Cunli2, HU Zongquan2, YUAN Yuxuan1, WEI Duan1, ZHAI Xinqing1, CHANG Zhe1   

  1. 1. School of Energy, China University of Geosciences (Beijing), Beijing 100083, China
    2. Petroleum Exploration and Development Research Institute, SINOPEC, Beijing 100089, China
  • Received:2023-06-05 Revised:2023-06-29 Online:2023-10-10 Published:2023-11-14

摘要:

基于塔里木盆地西北缘阿克苏地区的野外露头观察和北部地区重点探井的测井资料分析和薄片鉴定工作,建立塔里木盆地塔北地区的高精度层序地层格架,分析肖尔布拉克组碳酸盐岩台地的演化过程及微生物礁滩发育模式。研究认为肖尔布拉克组可分为2个三级层序(SQ1和SQ2)和5个四级层序(sq1、sq2、sq3、sq4和sq5),其中sq1和sq2发育层状微生物席,为中-内缓坡沉积,对应缓坡型台地;sq3时期相对海平面先上升后下降,缓坡型台地转变为弱镶边台地,在古地貌高地微生物开始建礁,古地貌较低的斜坡区微生物岩基本不发育;sq4和sq5时期海平面持续下降,弱镶边台地发育,sq4发育藻粒滩和微生物礁沉积,sq5发育砂屑滩、砾屑滩和微生物礁沉积。高精度层序地层对比结果显示海平面的变化在垂向上控制着微生物礁滩的演化特征,古地貌在平面上控制着微生物礁滩的分布。

关键词: 高精度层序划分, 层序地层格架, 微生物礁滩, 沉积相, 发育模式

Abstract:

Based on the outcrop observation in Aksu area in the northwestern Tarim Basin, and the analysis of logging data and thin section identification of key exploration wells there, the high-precision sequence stratigraphic framework at north Tarim Basin is established.We analyzed the development model of microbial reef-shoal and carbonate platform evolution in the Xiaoerbulak period, and suggested that the Xiaoerbulak Formation can be subdivided into two third-order sequences (SQ1 and SQ2) and five fourth-order sequences (sq1, sq2, sq3, sq4 and sq5): sq1 and sq2 developed layered microbial mats, which were middle-inner ramp deposition, corresponding to the ramp carbonate platform stage; sq3 is a transition period from ramp carbonate platform to slightly rimmed shelf carbonate platform, and the relative sea-level likely rose first and then fell, and microorganisms began to build reefs in the paleo-geomorphic highlands, and the microbiolites were basically undeveloped in the slope area of low paleo-geomorphic terrain; sq4 and sq5 represent the stage of slightly rimmed shelf carbonate platform with continuous sea-level decline; sq4 developed algal grain shoal and microbial reef deposits, whilst sq5 developed sand shoal, gravel shoal and microbial reef deposits.The high-precision sequence stratigraphic correlation shows that the sea-level change controlled the vertical development of microbial reef shoal, and the paleo-geomorphology controlled the planar microbial reef shoal distribution.

Key words: high-precision sequence division, stratigraphic framework, microbial reef-shoal, sedimentary facies, development model

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