欢迎访问现代地质!

现代地质 ›› 2024, Vol. 38 ›› Issue (06): 1431-1444.DOI: 10.19657/j.geoscience.1000-8527.2024.113

• 能源地质学 • 上一篇    下一篇

鄂尔多斯地块庆阳—鄂托克旗古隆起地质特征及其形成与演化

马明1,2(), 刘池洋2(), 王建强2, 赵红格2, 马锦山3, 王建国1, 李少南4, 韩玉4, 马志强5, 全晓园6, 白蒙恩1, 张晴1   

  1. 1.青海大学地质工程学院,青海 西宁 810016
    2.西北大学地质学系,陕西 西安 710069
    3.西宁市国土勘测规划研究院有限公司,青海 西宁 810010
    4.青海省第一地质勘查院,青海 海东 810600
    5.青海有色地质工程勘察有限责任公司,青海 西宁 810021
    6.中国石化华北油气分公司勘探开发研究院,河南 郑州 450007
  • 出版日期:2024-12-10 发布日期:2024-12-09
  • 通信作者: 刘池阳,笔名刘池洋,男,教授,博士生导师,1953年出生,主要从事油气地质、能源地质、盆地动力学教学与科研。Email: lcy@nwu.edu.cn
  • 作者简介:马明,男,讲师,博士,1990年出生,主要从事区域构造、盆地分析方向教学与科研。Email:maming1002@qhu.edu.cn
  • 基金资助:
    中国石油股份公司重大科技专项项目“长庆油田5000万吨持续高效稳产关键技术研究与应用”(2016E-0514);中国石油股份公司科技项目(2018A-0104)

Geological Characteristics and Tectonic Evolution of the Qingyang-Etuoke Paleo-Uplift in the Ordos Block

MA Ming1,2(), LIU Chiyang2(), WANG Jianqiang2, ZHAO Hongge2, MA Jinshan3, WANG Jianguo1, LI Shaonan4, HAN Yu4, MA Zhiqiang5, QUAN Xiaoyuan6, BAI Mengen1, ZHANG Qing1   

  1. 1. School of Geological Engineering, Qinghai University, Xining, Qinghai 810016, China
    2. Department of Geology, Northwest University, Xi’an, Shaanxi 710069, China
    3. Land Surveying and Planning Institute Co., Ltd., Xining, Qinghai 810001, China
    4. Qinghai No.1 Academy of Geological Exploration, Haidong, Qinghai 810600, China
    5. Qinghai Nonferrous Geological Engineering Survey Institute Co., Ltd., Xining, Qinghai 810021, China
    6. Research Institute of Petroleum Exploration & Development, North China Branch of SINOPEC, Zhengzhou, Henan 450007, China
  • Published:2024-12-10 Online:2024-12-09

摘要:

鄂尔多斯地块西南部庆阳—鄂托克旗古隆起(简称庆—鄂古隆起),其地质特征及其形成演化过程对厘定华北板块西南缘动力学背景、古环境变迁及油气勘探等都有重要意义。基于地震、钻井、测井等资料分析,研究了古隆起形成时限、演化过程及其动力学背景。结果表明:上古生界与下伏地层、奥陶系与寒武系及寒武系与中新元古界之间存在3个不整合,寒武系和奥陶系发育同沉积正断层,且向古隆起方向地震相均表现为下部上超、顶部削截的特征;远离古隆起核心区域的中寒武统厚度变化不大,上寒武统和下奥陶统向古隆起方向减薄、缺失,且被中奥陶统穿时覆盖,上奥陶统发育局限;古隆起核心区域的中寒武统和中奥陶统缺失是剥蚀所致,且中寒武统连续沉积。据此认为庆—鄂古隆起主要形成于早古生代:早寒武世,南部初现古隆起雏形;中—晚寒武世,古隆起活动微弱;晚寒武世晚期至早奥陶世,古隆起隆升,未接收沉积;中奥陶世,古隆起隆升活动减弱;晚奥陶世到石炭纪沉积前,古隆起大幅度隆升并最终定型。古隆起形成的区域动力学环境与南邻秦岭洋、西邻古祁连—秦岭洋及贺兰裂陷槽的形成演化密切相关。本研究为华北板块西南缘早古生代构造背景确定及庆—鄂古隆起油气勘探提供了理论支撑与参考。

关键词: 庆—鄂古隆起, 构造特征, 形成时限, 演化过程, 鄂尔多斯地块

Abstract:

The geological characteristics, formation, and evolutionary processes of the Qing-E (Qingyang-Etuoke) Paleo-uplift in the southwestern Ordos Block are crucial for understanding the geodynamics, paleoenvironment, and oil and gas exploration along the southwest margin of the North China Plate.We investigated the formation timing, tectonic evolution, and geodynamics of the Qing-E Paleo-uplift in the Ordos Basin using seismic, well, and log data.The results indicate that three unconformities can be identified based on the seismic data: between the Upper Paleozoic and the underlying strata, between the Neoproterozoic-Paleozoic and the Cambrian, and between the Cambrian and the Ordovician.Synsedimentary normal faults were observed in the Cambrian and Ordovician, with seismic facies characterized by onlap at the base and truncation at the top in both the Cambrian and Ordovician strata.The well data indicated that the thickness of the Middle Cambrian remained consistent, while the Upper Cambrian and Lower Ordovician thinned and eventually disappeared, being unconformably overlain by the Middle Ordovician.The Upper Ordovician developed to a limited extent.The disappearance of the Middle Cambrian and Middle Ordovician was due to erosion, while the sedimentation process of the Middle Cambrian was continuous.We concluded that the Paleo-uplift was formed during the Early Paleozoic.The prototype of the Paleo-uplift was formed during the Early Cambrian, influenced by the pre-existing framework.By the Mid-Late Cambrian, the uplift activity of the Paleo-uplift gradually weakened.From the end of the Late Cambrian to the Early Ordovician, the uplift of the Paleo-uplift led to the erosion of certain strata, including the Upper Cambrian and Lower Ordovician.However, during the Middle Ordovician, the Paleo-uplift gradually transitioned into a submarine uplift.By the Late Ordovician, the Paleo-uplift experienced significantly uplift and was ultimately completed under the influence of the Caledonian movement.The geodynamics of the Qing-E Paleo-uplift was closely linked to the tectonic setting and evolution of the western and southern margins of the North China Craton during the Early Paleozoic.This study provides theoretical support and serves as a reference for determing the early Paleozoic tectonic setting in the southwest margin of the North China Plate, as well as for oil and gas exploration in the Qing-E Paleo-uplift.

Key words: Qingyang-Etuoke Paleo-uplift, structural characteristics, formation period, evolution, Ordos Block

中图分类号: