地学前缘 ›› 2016, Vol. 23 ›› Issue (5): 221-234.DOI: 10.13745/j.esf.2016.05.023

• 非主题来稿选登 • 上一篇    下一篇

鄂尔多斯西南部待建纪黄旗口期和王全口期原盆面貌及其成因机制分析

 宋立军, 刘池阳, 赵红格, 王建强   

  1. 1. 西安石油大学 地球科学与工程学院， 陕西 西安 710065
    2. 西北大学 地质学系， 陕西 西安 710069
    3. 西北大学 大陆动力学国家重点实验室， 陕西 西安710069
  • 收稿日期:2015-12-02 修回日期:2016-01-05 出版日期:2016-09-15 发布日期:2016-09-15
  • 通讯作者: 刘池阳(1953—)，笔名刘池洋，男，教授，博士生导师，从事盆地动力学、油气地质与勘探、构造地质及能源地质等方面的教学科研工作。E-mail:lcy@nwu.edu.cn
  • 作者简介:宋立军(1977—)，男，副教授，主要从事盆地分析及构造地质方面的教学与研究工作。
  • 基金资助:

    国家自然科学重点基金项目(90814005)；国家自然科学基金青年项目(41102072)；陕西省自然科学基金项目(Z09045)；构造地质与油气资源教育部重点实验室基金项目(TPR-2012-20)；陕西省教育厅基金项目(12JK0479)

An analysis of prototype basin Period and its genetic mechanism of Huangqikou Period and Wangquankou Period, Southwest Ordos Basin.

 SONG  Li-Jun, LIU  Che-Yang, DIAO  Gong-Ge, WANG  Jian-Jiang   

  1. 1. Geosciences and Engineering Faculty, Xian Shiyou University, Xian 710065, China
    2. Department of Geology, Northwest University, Xian 710069, China
    3. State Key Laboratory of Continental Dynamics, Northwest University, Xian 710069, China
  • Received:2015-12-02 Revised:2016-01-05 Online:2016-09-15 Published:2016-09-15

PDF (PC)

16449

摘要：

鄂尔多斯西南部中新元古代各期原型盆地经历了复杂的构造演化与多期后期构造运动的改造，造成多期原型盆地垂向叠加、各期原盆面貌不复存在，以致制约了对各期原盆面貌、演化过程及其动力学环境的深入理解，也制约了油气勘探的合理开展。本文在地震、钻井与测试资料分析的基础上，结合同期华北克拉通构造背景的研究，探讨了鄂尔多斯西南部中新元古代主要阶段的原盆面貌及其成因机制，结果显示：黄旗口期早期，在华北克拉通处于顺时针旋转的构造背景下，鄂尔多斯盆地西南缘地区走滑伸展裂陷，陆内裂陷槽内主要发育陆相冲积扇体系、三角洲体系粗碎屑岩沉积；晚期，随着裂陷活动减弱，区域坳陷，致使黄旗口组上部湖泊三角洲体系碎屑坳陷层序呈广覆式覆盖在裂陷层序之上。进入王全口期，随着区域构造挤压的增强，鄂尔多斯西南缘祁连造山带东段马衔山片麻状火山弧同碰撞“S型”二长花岗岩侵入，鄂尔多斯地区西南部由早期裂陷环境彻底转变为弧后挤压坳陷环境，在此挤压坳陷环境下，区域发育了一套潮坪体系含叠层石白云岩为主的王全口组碳酸盐岩沉积。随后区域遭受挤压隆升，区域缺失青白口系和南华系。

关键词: 待建系, 黄旗口期, 王全口期, 原盆面貌, 成因机制, 鄂尔多斯西南部

Abstract:

Owing to complicated geological evolution and the following reformation caused by the succeeding strong multiphase tectonic movement, the multiperiod prototype basin of the Mesoproterozoic southwestern Ordos Basin was vertically stacked, and the original appearance of each prototype basin was no longer in existence, which restricted the indepth understanding of the original appearance of each prototype basin, of the stacking process of multiphase basin prototype, of its dynamic environment, and of the reasonable exploration of oil and gas. Combined with the tectonic background research of North China Craton at the same time, the prototype basin and its genetic mechanism of Huangqikou and Wangquankou in Daijian Period, Southwest Ordos Basin have been analyzed through the seismic interpretation, drilling data interpretation, and test data analysis. The research findings show that in the early stage of Huangqikou Period, under the background of the clockwise rotation of the North China Craton, the research area, the southwestern Ordos Basin, was rifting under the strikeslip extensional dynamic environment, and filled with a large number of alluvial fan systems and delta systems and a small lake system. In the late stage of Huangqikou Period, the research area began to enter into the postrift depression stage, mainly was filled with lakedelta system covered the lower lacunae sequence of lower Huangqikou Formation. In Wangquankou Period, with the increase in regional extrusion, owing to the subduction of oceanic crust, the “S” type of monzonitic granite of Xiazhai System derived from volcanic arc or syncollision orogeny intruded in Maxianshan group; the southwestern Ordos Basin was under the backarc compressive depression dynamic environment, which developed a set of carbonate rocks of tidal flat depositional system, mainly stromatolite dolostone. Then, because of compressive uplifting, the Daijian System (Huangqikou Formation and Wangquankou Formation), underwent erosion in Qingbaikou Period and Nanhua Period.

Key words: Daijian System, Huangqikou stage, Wangquankou stage, prototype basin, genetic mechanism, Southwest Ordos Basin

中图分类号: