鄂尔多斯盆地加里东期不整合面类型及分布特征<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2022.05.069

古地理学报 ›› 2022, Vol. 24 ›› Issue (5): 970-988. doi: 10.7605/gdlxb.2022.05.069

所属专题：近年来的相关构造古地理学文章；

• 热烈庆贺西北大学建校120周年 • 上一篇下一篇

鄂尔多斯盆地加里东期不整合面类型及分布特征^*

熊加贝^1,2,3, 何登发^1,2,

1 中国地质大学(北京)能源学院,北京 100083;
2 中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室,北京 100083;
3 中国石油天然气股份有限公司浙江油田分公司,浙江杭州 311100

收稿日期:2022-06-15 修回日期:2022-08-09 出版日期:2022-10-01 发布日期:2022-10-10
通讯作者: 何登发,男,1967年生,1989年毕业于西北大学地质学系,1995年毕业于中国石油勘探开发研究院,获博士学位,主要从事含油气盆地构造分析。E-mail: hedengfa282@263.net。
作者简介:熊加贝,女,1997年生,中国地质大学(北京)硕士研究生,主要从事沉积盆地特征研究。E-mail: 805590121@qq.com。
*庆贺西北大学建校120周年!
基金资助:
国家自然科学基金企业创新发展联合基金项目(编号: U19B6003),中国石油长庆油田公司科技攻关项目(编号:ZDZX2021-01)联合资助

Types and distribution characteristics of the Caledonian unconformities in Ordos Basin

XIONG Jiabei^1,2,3, HE Dengfa^1,2,

1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083,China;
2 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism(Ministry of Education), China University of Geosciences(Beijing),Beijing 100083,China;
3 PetroChina Zhejiang Oilfield Company,Hangzhou 311100,China;

Received:2022-06-15 Revised:2022-08-09 Online:2022-10-01 Published:2022-10-10
Contact: HE Dengfa,born in 1967,graduated from Geology Department, Northwest University in 1989. Now he is mainly engaged in structural analysis of petroliferous basins. E-mail: hedengfa282@263.net.
About author:XIONG Jiabei,born in 1997,is a master degree candidate of China University of Geosciences(Beijing). Now she is mainly engaged in researches of the depositional basin tectonic characteristics. E-mail: 805590121@qq.com.
Supported by:
Co-funded by the United Foundation Project of the National Natural Science Foundation of China for Company Innovation and Development(No. U19B6003),and the Project of Tackling the Science and Technological Key Problems in PetroChina Changqing Oil and Gas Field Company(No. ZDZX2021-01)

摘要/Abstract

摘要： 加里东期不整合面是早古生代华北板块内一个重要的盆地性质转换界面。鄂尔多斯盆地奥陶系风化壳岩溶型油气藏和二叠系本溪组、太原组铝土质泥岩气藏的发现,促进了地质学家对该地区古生代加里东运动性质的探讨。基于大量的野外露头、钻井和地震资料,对加里东运动形成的不整合面的识别标志、不整合类型及其空间分布、不整合结构和时间变量进行深入解析。研究表明: (1)加里东运动后,鄂尔多斯盆地的古地貌形态大致可分为鄂托克旗—定边一带的高地貌区、神木—靖边—富县以及吴忠地貌过渡区、中东部地势低缓东倾区; (2)奥陶系顶部不整合面相邻地层呈角度各异的接触关系,具有“削截(下)—整一(上)”、“削截(下)—超覆(上)”的结构,整体表现为盆地边缘为具削截和褶皱的高角度不整合、盆缘向盆内过渡地区的低角度不整合及盆内大范围分布的平行不整合; (3)不整合面也是上、下古生界之间形成的主要风化壳界面,长期的沉积间断和风化剥蚀为该区铝土质泥岩发育奠定了环境背景,而铝土岩不仅可作为下古生界风化壳气藏的理想盖层,同时也是陇东勘探新区天然气大规模聚集成藏的有利场所。

关键词: 鄂尔多斯盆地, 奥陶系, 古地貌, 风化壳, 不整合面, 加里东运动

Abstract: The Caledonian unconformity is an important interface for transformation of basin types in the Early Paleozoic North China plate. The discovery of Ordovician weathered crust and paleokarsts as the oil and gas reservoirs and aluminous mudstone gas reservoirs in the Benxi and Taiyuan formations in the Ordos Basin has promoted geologists to explore the Caledonian orogeny in the Paleozoic in this area. Based on a number of field outcrops,drilling and seismic data,the following understandings are obtained with respect to the identification marks,geography,structures and time variables of the unconformity formed by the orogeny. (1)The paleogeomorphic formed after the Caledonian orogeny can be roughly divided into the highland area of Etok Banner-Dingbian area,the geomorphic transition area of Shenmu-Jingbian-Fuxian and Wuzhong areas,and the low-lying and gently eastward inclined area in the Middle East. (2)The adjacent strata of the unconformity surface at the top of the Ordovician are in contact with different angles,and have the structure of “truncation(bottom)-integration(top)”,“truncation(bottom)-overlap(top)”,which is characterized by a high-angle unconformity of cutting and folding at the basinal edge,a low-angle unconformity from basinal edge to the basin,widely distributed parallel unconformity in the basin. (3)The unconformity in this area is also the main weathering crust interface formed between the Upper and Lower Paleozoic. The long-term sedimentary discontinuity and weathering and denudation have laid an environmental background for the development of aluminous mudstone in this area. Bauxite is not only an ideal caprock for the Lower Paleozoic gas reservoir,but also a favorable place for large-scale accumulation of natural gas in the Longdong exploration new area,which is worthy of attention.

Key words: Ordos Basin, Ordovician, ancient landform, weathering crust, unconformity, Caledonian movement

中图分类号:

P542.3^+4

熊加贝, 何登发. 鄂尔多斯盆地加里东期不整合面类型及分布特征^*[J]. 古地理学报, 2022, 24(5): 970-988.

XIONG Jiabei, HE Dengfa. Types and distribution characteristics of the Caledonian unconformities in Ordos Basin[J]. JOPC, 2022, 24(5): 970-988.

http://www.gdlxb.cn/CN/Y2022/V24/I5/970

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