基于地震与非地震联合约束下复杂冲断带构造建模:以西昆仑山前柯东构造带为例  

Structural Modeling for Complex Thrust Belts Based on Integrated Seismic and Non-seismic Data: A Case Study of the Kedong Structural Belt in the Piedmont of Western Kunlun Mountains

作　　者：吴鸿翔 邹乐君[1] 张欲清 李春阳 杨少梅 程晓敢[1] 章凤奇[1] WU Hongxiang;ZOU Lejun;ZHANG Yuqing;LI Chunyang;YANG Shaomei;CHENG Xiaogan;ZHANG Fengqi(School of Earth Sciences, Zhejiang University, Hangzhou 310027, China)

机构地区：[1]浙江大学地球科学学院,杭州310027

出　　处：《高校地质学报》2019年第2期259-267,共9页Geological Journal of China Universities

基　　金：国家自然科学基金项目(41720104003);国家科技重大专项(2017ZX05008001;2016ZX05003001);国家重点研发计划(2016YFC0601004)联合资助

摘　　要：柯东构造带是揭示西昆仑山前冲断带变形过程的关键区之一,也是当前油气勘探重要的目标区。由于该区构造变形强、地层速度变化快以及地表条件复杂等因素,导致当前勘探面临着地震勘探资料品质差,构造建模多解性强等问题。文章利用R型因子降维分析方法,通过对柯东构造带甫沙地区的重、磁、电反演成果进行降维分析,结果表明甫沙地区深部发育断块构造,不存在地震剖面上显示的背斜构造;同时联合地震资料的综合解释,认为现今的甫沙地区发育的断块构造是早期的完整背斜受早更新世山前右旋走滑断裂改造的结果。在柯东构造带的综合建模实践表明,通过地震与非地震方法的联合约束可以为认识复杂冲断带的构造变形提供有效的手段。The Kedong structural belt is one of the key areas to reveal the deformation processes of thrust belts in the piedmont of western Kunlun Mountains, as well as an important target area for petroleum exploration at present. Because of strong structural deformation, fast change in seismic velocity across strata and complex surface conditions, the present exploration faces problems of poor-quality seismic data, resulting in multiple interpretations of structural modeling. This work uses R factor dimensionality reduction method to analyze the inversion of gravity, magnetic and electrical data of Fusha area in the Kedong belt. The results show that there is a fault block structure beneath Fusha area and seismic image does not show an anticline structure. Meanwhile, together with the seismic interpretation, we propose that the Fusha fault block structure was a result of an earlier complete anticline reworked by a dextral strike-slip fault in the Early Pleistocene. The practice of comprehensive modeling in the Kedong structural belt shows that the integrated method of seismic and non-seismic data can provide a powerful tool to understand the complex deformation processes in a complex thrust belt.

关 键 词：多因子降维法 地震与非地震联合方法 构造建模 柯东构造带 西昆仑山前 

分 类 号：P542[天文地球—构造地质学] P318[天文地球—地质学]