地学前缘 ›› 2016, Vol. 23 ›› Issue (5): 1-10.DOI: 10.13745/j.esf.2016.05.001

• 构造 • 上一篇    下一篇

柴北缘大柴旦地区山前带构造建模及演化研究

 王大华, 王金铎, 肖永军, 李军亮   

  1. 1. 中国石油大学(华东) 地球科学与技术学院, 山东 青岛 266580
    2. 中国石化胜利油田分公司 勘探开发研究院 西部分院, 山东 东营 257000
  • 收稿日期:2015-10-15 修回日期:2016-01-15 出版日期:2016-09-15 发布日期:2016-09-15
  • 作者简介:王大华(1969—)，男，博士研究生，高级工程师，主要从事石油天然气地质综合研究工作。
  • 基金资助:

    中国地质调查局项目“柴达木盆地油气资源潜力评价”(1212010818054)；中国地质调查局项目“柴达木盆地古生代油气资源调查评价”(1212011120964)；中国石化重大专项“西部挤压盆地山前带综合建模研究与目标评价”(P11077)

Structure modeling and evolution of piedmont zone in Dachaidan area, north margin of Qaidam Basin.

 WANG  Da-Hua, WANG  Jin-Duo, XIAO  Yong-Jun, LI  Jun-Liang   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, China
    2. Western Branch Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257000, China
  • Received:2015-10-15 Revised:2016-01-15 Online:2016-09-15 Published:2016-09-15

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摘要：

针对柴北缘大柴旦地区北东、北西向两组逆冲推覆断裂交汇，构造变形极其复杂，构造解析困难的问题，充分利用野外地质调查、地震、重磁电、钻井(孔)等资料，理清了研究区主要断裂体系及其组合特征与展布规律。采用地表和地下构造、浅部和深部构造、地震和非震资料相结合的方法，开展了山前带构造建模研究与构造解析。通过研究，确定了研究区发育NW和近WE向两组断层和盆缘逆冲、盆内逆冲、盆内挤压走滑等3类断裂体系，平面上具有分区、分带性；建立了盆缘、盆内不同构造变形机制的构造解释模型；共识别出了挤压、伸展和走滑等3大类8种构造样式，明确了构造样式组合模式及其分布规律，理清了研究区“南北分带、东西分区”的构造变形特征；南西北东向构造演化剖面分析明确了盆缘、盆内推覆构造与盆内反冲构造后展式演化时序及其对中生界残留分布的控制作用。

关键词: 构造变形, 构造建模, 断裂组合, 大柴旦地区, 柴北缘

Abstract:

The coexistence of two groups of thrust faults (N E faults and N W faults) and the complication of structure deformation history make structure analysis and interpretation very difficult in Dachaidan area, Qaidam Basin. In order to solve the problem, field geological investigation, seismic, well logging and drilling data were used to identify key fault systems and their distribution patterns. By integrating the features of surface and subsurface structures, shallow and deep structures, seismic and nonseismic data, we carried out studies of the structure modeling and analysis. As results of our effort, two systems of thrust faults (N W faults and W E faults) were identified. Also, we found that those faults could be categorized into three systems as: basin margin thrust system, and intro basin thrust system, introbasin compression and strikeslip fault system. Those structure systems show different features in different areas and zones. We also constructed interpretation models of different deformation mechanisms in the basin and on basin margins. Three tectonic systems(compression, extension and strike slip) were identified, which can be further divided into eight structure styles. We also established structure coexistence patterns as well as their distribution patterns. The overall structure characteristics in the area can be summarized as ‘North part and south part belong to different zones; west part and east part belong to different systems’. By analyzing the SW NE tectonic evolution sections, we defined the back propagation structure evolution sequence of thrust nappes(on basin margin or in the basin) and back thrust structures (in the basin), as well as their influence on residual strata of the Mesozoic.

Key words: tectonic deformation, structure modeling, fault combination, Dachaidan area, north margin of Qaidam Basin

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