鄂尔多斯盆地西部中奥陶统克里摩里组沉积特征研究

欧阳征健; 冯娟萍; 姚韦卓; 李文厚; 王治中; 于世宇; 蔺赟婷; 武文源; 于天泽

doi:10.16152/j.cnki.xdxbzr.2024-06-006

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鄂尔多斯盆地西部中奥陶统克里摩里组沉积特征研究

鄂尔多斯盆地岩相古地理与沉积演化 | 更新时间：2024-12-16

- 鄂尔多斯盆地西部中奥陶统克里摩里组沉积特征研究
- Study on sedimentary characteristics of Middle Ordovician Keliomori Formation in western Ordos Basin
- 西北大学学报（自然科学版） 2024年54卷第6期页码：1004-1012
- 作者机构：
  
  1.兰州城市学院　培黎石油工程学院，甘肃　兰州　 730070
  2.西安科技大学　地质与环境学院，陕西　西安　 710054
  3.西北大学　地质学系，陕西　西安　 710069
- 作者简介：
  
  欧阳征健，男，博士后，副教授，从事造山带与盆地地质研究，ouyangzhengjian@126.com。
  冯娟萍，女，博士，副教授，从事岩石学及地球化学研究，fengjuanping@163.com
- 基金信息：
  
  甘肃省高校教师创新基金(2025B-8);兰州城市学院艾黎学科建设计划项目
- DOI：10.16152/j.cnki.xdxbzr.2024-06-006
  中图分类号： P631
- 纸质出版日期：2024-12-25，
  
  收稿日期：2024-09-11，
- 稿件说明：
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欧阳征健, 冯娟萍, 姚韦卓, 等. 鄂尔多斯盆地西部中奥陶统克里摩里组沉积特征研究[J]. 西北大学学报（自然科学版）, 2024,54(6):1004-1012.

OUYANG ZHENGJIAN, FENG JUANPING, YAO WEIZHUO, et al. Study on sedimentary characteristics of Middle Ordovician Keliomori Formation in western Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1004-1012.
欧阳征健, 冯娟萍, 姚韦卓, 等. 鄂尔多斯盆地西部中奥陶统克里摩里组沉积特征研究[J]. 西北大学学报（自然科学版）, 2024,54(6):1004-1012. DOI： 10.16152/j.cnki.xdxbzr.2024-06-006.

OUYANG ZHENGJIAN, FENG JUANPING, YAO WEIZHUO, et al. Study on sedimentary characteristics of Middle Ordovician Keliomori Formation in western Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1004-1012. DOI： 10.16152/j.cnki.xdxbzr.2024-06-006.

摘要

鄂尔多斯盆地西部下古生界奥陶系因油气勘探潜力大一直备受关注。其中，中奥陶统克里摩里组发育的碳酸盐岩有望成为下一个勘探目标层，因此，对其沉积特征进行深入剖析可以为西缘奥陶系天然气勘探提供地质依据。通过野外剖面考察、岩心观察和薄片鉴定等手段，研究了克里摩里组的岩石学特征、沉积相类型及其空间展布规律。结果表明，克里摩里组岩性主要为薄层泥晶灰岩、砾屑、砂屑、粉屑灰岩、(含)生物碎屑灰岩及黑色页岩。泥晶结构、粒屑结构发育可见薄层状、纹层状、瘤状、角砾状构造和滑塌及鲍马层序。沉积相类型以台地前缘斜坡和深水斜坡海槽发育为主要特征，表现为沿南北向呈狭窄的条带状展布，在自东向西方向上，紧邻鄂尔多斯本部的开阔海台地发育台地前缘斜坡相带，向西迅速相变为深水斜坡海槽相，海水具有逐渐加深的趋势。

Abstract

The Lower Paleozoic Ordovician system in the western Ordos Basin has attracted much attention because of its great potential for oil and gas exploration

and the carbonate rock developed in the Middle Ordovician Keliomori Formation is expected to be the next exploration target layer

so study on its sedimentary characteristics can provide geological basis for the exploration of Ordovician gas in the west margin. By means of outcrops investigation

core observation and thin section identification

the characteristics of petrology

sedimentary facies types and spatial distribution of the Keliomori Formation are studied. It is shown that the Keliomori Formation is mainly composed of thin layer micrite

calcirudyte

calcarenite

calcisiltite

bioclastic limestone and black shale. They have micrite structure

granular structure

and thin layer

lamellar

nodular

brecciform structure

slump and Bauma sequence can be seen. The sedimentary facies platform front slope and deep water slop-trough

which are distributed in a narrow strip along the north-south direction. From east to west

the platform front slope facies develops in the open sea platform close to the Ordos base

and rapidly changes into deep water slop-trough facies westward

and the sea water has a gradual deepening trend.

关键词

鄂尔多斯盆地西部奥陶系克里摩里组沉积特征

Keywords

western Ordos BasinOrdovicianKeliomori Formationsedimentary characteristics

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