古地理学报 ›› 2013, Vol. 15 ›› Issue (6): 751-764. doi: 10.7605/gdlxb.2013.06.062

• 岩相古地理学及沉积学 •    下一篇

鄂尔多斯西部地区中—晚奥陶世克里摩里期—乌拉力克期岩相古地理

马占荣1,2, 白海峰1,2, 刘宝宪1,2, 王红伟1,2, 陈调胜1,2   

  1. 1 低渗透油气田勘探开发国家工程实验室,陕西西安 710018
    2 中国石油长庆油田分公司勘探开发研究院,陕西西安 710018
  • 收稿日期:2012-10-26 修回日期:2013-05-03 出版日期:2013-12-01 发布日期:2013-12-01
  • 作者简介:马占荣,男,1979年生,工程师,2005年毕业于中国石油大学(华东)构造地质学专业,获硕士学位,现主要从事天然气勘探地质研究工作。联系电话:13572183309。E-mail: mazr_cq@petroChina.com.cn。
  • 基金资助:
    国家科技重大专项(编号:2011ZX05004-006)资助; “第12届全国古地理学及沉积学学术会议”青年优秀论文

Lithofacies palaeogeography of the Middle-Late Ordovician Kelimoli and Wulalike Ages in western Ordos area

Ma Zhanrong1,2, Bai Haifeng1,2, Liu Baoxian1,2, Wang Hongwei1,2, Chen Tiaosheng1,2   

  1. 1 National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields,Xi′an 710018,Shaanxi
    2 Research Institute of Exploration & Development of Changqing Oilfield Company,PetroChina,Xi′an 710018,Shaanxi
  • Received:2012-10-26 Revised:2013-05-03 Online:2013-12-01 Published:2013-12-01
  • About author:Ma Zhanrong,born in 1979,engineer,graduated from China University of Petroleum(East China)in 2005.Now he is engaged in natural gas geology exploration in Research Institute of Exploration & Development of Changqing Oilfield Company,PetroChina.E-mail: mazr_cq@petroChina.com.cn.

摘要: 中奥陶世克里摩里期,鄂尔多斯西部地区为镶边陆架的碳酸盐岩台地,自东向西依次发育开阔台地、台地边缘浅滩、台缘斜坡—斜坡脚、广海陆棚和深水海槽相带,从浅水区经由碎屑流搬运来的块状钙质角砾岩在台缘斜坡—斜坡脚相带集中堆积,形成厚度不等的透镜体夹于正常深水灰泥石灰岩和泥岩中。乌拉力克期发生较大规模构造运动,盆地东部整体抬升,西部边缘发生裂陷,沉积范围以同生正断层为界,随着海平面的上升沉积环境演变为相对闭塞的深水斜坡—盆地,沉积一套富含笔石的泥页岩地层,并不时有陆源克里摩里组垮塌的石灰岩沉积物被带入盆地,形成数量不等的多套角砾岩夹层。

关键词: 鄂尔多斯西部, 钙质角砾岩, 碎屑流, 岩相古地理

Abstract: During the Middle Ordovician Kelimoli Age,a rimmed carbonate platform occurred in western Ordos area,with open marine platform,platform-margin shoal,slope,toe-of-slope,deep shelf and deep trough facies orderly distributed from east to west.Massive calcareous breccias packages in thin or thick lenticular shapes derived by debris-flow from east shallow water facies,accumulated along slope to toe-of-slope,and surrounded by in-site deep water micrite and mudstone.Strong tectonic movement happened during the Wulalike Age,faulting in the western margin and uplifting in the whole eastern Ordos Basin.Sediments restricted by border syn-sedimentary faults.As sea level rising,sedimentary setting changed to relative restricted deep slope-basin.Rocks of the Wulalike Formation are mainly composed of abundant graptolite bearing mudstone and shale,intercalated with several calcareous breccias which transported by debris flow from the early collapsed Kelimoli Formation limestone in the east uplift land.

Key words: western Ordos area, calcareous breccias, debris flow, lithofacies palaeogeography

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