鄂尔多斯盆地寒武纪沉积演化及天然气成藏条件分析

陈强; 李文厚; 李智超; 张倩

doi:10.16152/j.cnki.xdxbzr.2024-06-003

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鄂尔多斯盆地寒武纪沉积演化及天然气成藏条件分析

鄂尔多斯盆地岩相古地理与沉积演化 | 更新时间：2024-12-16

- 鄂尔多斯盆地寒武纪沉积演化及天然气成藏条件分析
- Cambrian sedimentary evolution and natural gas accumulation conditions in Ordos Basin
- 西北大学学报（自然科学版） 2024年54卷第6期页码：961-974
- 作者机构：
  
  1.长安大学　地球科学与资源学院/土地工程学院，陕西　西安　 710054
  2.西北大学　地质学系，陕西　西安　 710069
- 作者简介：
  
  陈强，男，博士，从事沉积学研究，qchen@chd.edu.cn。
- 基金信息：
  
  陕西省自然科学基础研究计划项目(2021JM-158);国家科技重大专项(2011ZX05005-004-07HZ);中央高校基本科研业务费资助项目(0009-2014G1271062)
- DOI：10.16152/j.cnki.xdxbzr.2024-06-003
  中图分类号： P531
- 纸质出版日期：2024-12-25，
  
  收稿日期：2024-09-11，
- 稿件说明：
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陈强, 李文厚, 李智超, 等. 鄂尔多斯盆地寒武纪沉积演化及天然气成藏条件分析[J]. 西北大学学报（自然科学版）, 2024,54(6):961-974.

CHEN QIANG, LI WENHOU, LI ZHICHAO, et al. Cambrian sedimentary evolution and natural gas accumulation conditions in Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 961-974.
陈强, 李文厚, 李智超, 等. 鄂尔多斯盆地寒武纪沉积演化及天然气成藏条件分析[J]. 西北大学学报（自然科学版）, 2024,54(6):961-974. DOI： 10.16152/j.cnki.xdxbzr.2024-06-003.

CHEN QIANG, LI WENHOU, LI ZHICHAO, et al. Cambrian sedimentary evolution and natural gas accumulation conditions in Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 961-974. DOI： 10.16152/j.cnki.xdxbzr.2024-06-003.

摘要

基于多年来对鄂尔多斯盆地寒武纪的研究成果，在大量野外剖面观察、钻井及岩心资料分析的基础上，对寒武纪地层划分、沉积体系类型、沉积演化特征及成藏条件进行研究。研究表明，研究区寒武系发育滨岸潮坪、碳酸盐台地、台地边缘3类沉积体系，鄂尔多斯盆地寒武纪为稳定大陆边缘陆表海沉积，由内向外表现为台内局限潮坪—台外开阔台地—台缘鲕粒滩—台前斜坡的构造古地理格局，沉积演化经历了早寒武世滨岸潮坪、中寒武世局限-开阔台地、晚寒武世局限-蒸发台地3个阶段，构成一个完整的演化旋回。研究认为，鄂尔多斯盆地寒武纪不发育深水沉积，烃源岩整体发育较差。晚寒武世—早奥陶世的怀远运动造成中央古隆起的形成，影响了晚寒武世的沉积格局，并且控制了中上寒武统的白云岩化作用及岩溶储层的发育。

Abstract

Based on the authors’ years research on Cambrian in Ordos Basin

and combined with field profile observation and drilling data analysis in recent years

the stratigraphic division

sedimentary system types

sedimentary evolution characteristics and nature gas accumulation condition of the Cambrian were studied. The research shows that there are three types of sedimentary systems in Cambrian: coastal tidal flat

carbonate platform and platform margin

and the Cambrian of Ordos Basin is composed of epicontinental deposits on a stable continental margin. The tectonic paleogeographic pattern of the carbonate platform is represented by inner restricted tidal flat

outer open platform

marginal oolitic beach and front slope from inside to outside. And the sedimentary evolution experienced a complete evolution cycle

including Early Cambrian coastal tidal flat

Middle Cambrian restricted to open platform and Late Cambrian restricted to evaporation platform. The result suggests that the deep-water deposits are not developed in the Cambrian of Ordos Basin

and the hydrocarbon source rocks are usually poorly developed. The Huaiyuan Movement during the Late Cambrian to Early Ordovician resulted in the formation of the Central Paleouplift

which affected the sedimentary pattern of the Late Cambrian and controlled the dolomitization of the Middle-Upper Cambrian and the development of weathered crust karst reservoirs.

关键词

沉积体系沉积演化成藏条件寒武纪鄂尔多斯盆地

Keywords

depositional systemsedimentary evolutionaccumulation conditionCambrianOrdos Basin

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