石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (1): 89-100.doi: 10.11743/ogg20230107

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地早古生代庆阳和乌审旗古隆起构造演化及其对寒武系岩相古地理的控制

张春林1(), 邢凤存2,3(), 张月巧1, 姜福杰4, 徐旺林1, 张阿敏5   

  1. 1.中国石油 勘探开发研究院,北京 100083
    2.成都理工大学 油气藏地质与开发工程国家重点实验室,四川 成都 610059
    3.成都理工大学 沉积地质研究院,四川 成都 610059
    4.中国石油大学(北京) 地球科学学院,北京 102249
    5.中国石油 青海油田公司 采油一厂,青海 海西 816400
  • 收稿日期:2022-05-30 修回日期:2022-10-20 出版日期:2023-01-14 发布日期:2023-01-13
  • 通讯作者: 邢凤存 E-mail:mike_zcl@163.com;xingfengcun@163.com
  • 第一作者简介:张春林(1979—),男,博士、高级工程师,沉积储层与油气勘探目标评价。E-mail: mike_zcl@163.com
  • 基金项目:
    中国科学院A类先导科技专项(XDA14010403);中国石油“十四五”重大科技项目(2021DJ0605);国家科技重大专项(2016ZX05007-002)

Tectonic evolution of Qingyang and Wushenqi paleo-uplifts during the Early Paleozoic and its control on Cambrian lithofacies paleogeography in the Ordos Basin

Chunlin ZHANG1(), Fengcun XING2,3(), Yueqiao ZHANG1, Fujie JIANG4, Wanglin XU1, Amin ZHANG5   

  1. 1.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China
    2.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    3.Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu,Sichuan 610059,China
    4.College of Geosciences,China University of Petroleum (Beijing),Beijing 102249,China
    5.No. 1 Oil Extraction Factory,Qinghai Oil Field Company,PetroChina,Haixi,Qinghai 816400,China
  • Received:2022-05-30 Revised:2022-10-20 Online:2023-01-14 Published:2023-01-13
  • Contact: Fengcun XING E-mail:mike_zcl@163.com;xingfengcun@163.com

摘要:

鄂尔多斯盆地早古生代南、北两个古隆起的构造演化过程认识尚不明确,制约了油气勘探及盆地沉积充填演化过程的研究。基于最新钻井、野外剖面及地震资料,采用地震反射接触关系和滨岸相识别等手段,对庆阳古隆起和乌审旗古隆起进行约束与刻画,认为其总体经历了寒武纪的古隆起逐渐淹没阶段、寒武纪—奥陶纪的抬升剥蚀阶段、早奥陶世冶里组-亮甲山组沉积期之后的庆阳古隆起稳定-乌审旗古隆起快速沉降阶段、晚加里东期的挤压剥蚀和古隆起范围定型阶段、石炭纪—二叠纪的古隆起消亡阶段及二叠纪之后的构造掀斜定型阶段等6个主要阶段,南、北两个古隆起具有早期发育特征相近、后期南部隆升-北部沉降的演化差异。两个古隆起形成隆-凹相间的古构造格局,对寒武系沉积储层控制明显。古隆起总体呈东缓-西陡的古地貌特征,古隆起东侧相对于西侧更有利于大面积白云岩储层的发育。庆阳古隆起和乌审旗古隆起在寒武纪的演化过程中对岩相古地理格局的控制具有差异性,总体上前者控制地貌隆-凹格局及沉积更为持续。寒武纪晚期的怀远构造运动导致鄂尔多斯盆地抬升剥蚀,致使寒武系顶部岩溶作用普遍发育。

关键词: 古隆起, 构造演化, 沉积充填, 岩相古地理, 寒武系, 鄂尔多斯盆地

Abstract:

The tectonic evolution process of Paleozoic paleo-uplifts in the north and south of the Ordos Basin is still not quite clear and this restricts the oil and gas exploration and the study on sedimentary filling evolution process in the basin. Based on the latest drilling, outcrop and seismic data, the study characterizes and defines the Qingyang and Wushenqi paleo-uplifts by means of seismic identification of reflector contact relationship and shore facies. The results show that the two paleo uplifts have experienced six major stages of evolution, namely the gradual submersion in the Cambrian, uplifting and denudation from the Cambrian to the Ordovician, stabilization of the Qingyang paleo-uplift and rapid subsidence of the Wushenqi paleo-uplift after the Yeli-Liangjiashan period, the compression, denudation and finalization of the paleo-uplifts during the Late Caledonian, the extinction of the paleo-uplifts in Carboniferous-Permian, and the tectonic tilting and finalization after the Permian. The two paleo-uplifts were similar during the early stages and differentiated during late stages with the south uplift rising and north uplift subsiding. The two paleo-uplifts together formed an alternative rising-subsiding framework that had obviously controlled the sedimentary reservoirs of the Cambrian system. The paleo uplifts are gentle in the east and steep in the west. The east is more favorable for the large scale development of dolomite reservoirs. During the process of Cambrian lithofacies paleogeography evolution, both paleouplifts controlled the lithofacies paleogeography framework but with the Qingyang paleouplift working more continuously on the uplift-depression pattern and sedimentation. The Huaiyuan tectonic movement in the late Cambrian led to the uplift and denudation of the Ordos Basin, resulting in a widespread development of karstification at the top of the Cambrian.

Key words: paleo-uplift, tectonic evolution, sedimentary filling, lithofacies paleogeography, Cambrian, Ordos Basin

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