准噶尔盆地四棵树凹陷多期应力场作用下的构造演化特征  

Evolution of structural characteristics with multistage stress fields in the Sikeshu Sag, Junggar Basin

作　　者：郭宏辉 何新明[1] 朱林涛 冯建伟 杜赫 曲君晓 GUO Honghui;HE Xinming;ZHU Lintao;FENG Jianwei;DU He;QU Junxiao(Northwest Oilfield Company,SINOPEC,Urumqi 830011,China;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;School of Geosciences,China University of Petroleum(East China),Qingdao Shandong 266580,China;Sanshanzi Gold Mine,Shandong Gold Group,Laizhou Shandong 261442,China)

机构地区：[1]中国石化西北油田分公司,乌鲁木齐830011 [2]中国矿业大学资源与地球科学学院,江苏徐州221116 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [4]山东黄金三山子金矿,山东莱州261442

出　　处：《地质科技通报》2024年第5期146-160,共15页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(42072234);中石化科研项目(P23064)。

摘　　要：准噶尔盆地南缘四棵树凹陷位于北天山山前冲断带西段,盆地自古生代以来经历了多期、多向的构造运动;明确研究区构造系统特征及其演化过程,对此类含油气盆地的油气勘探开发具有重要意义。在前人地质研究的基础上,结合详细的地震资料解释、地质调查与地层发育特征,根据研究区构造发育背景,以四棵树凹陷构造格局的变动和多期应力场为线索,对四棵树凹陷构造演化过程进行了系统性分析。研究表明,四棵树凹陷深部发育挤压反转-走滑构造层、浅部发育推覆-滑脱构造层;平面上根据构造样式发育特征可划分为南部挤压断褶带、中部走滑压扭带、北部隆起带;凹陷经历了2期强烈的构造隆升期,对应2期断裂活动高峰期;构造环境及应力场条件发生了多次转变,晚石炭世至早中二叠世为弧后裂陷背景下的NNW-SSE向伸展裂陷期、晚二叠世至三叠纪为扎伊尔山造山运动下NNW-SSE向挤压的断坳转换期、晚侏罗世至古近纪为周缘造山带与车排子凸起的共同作用下NNW-SSE向挤压陆内坳陷期、新近纪为北天山强烈的造山活动背景下NS向挤压作用的复活前陆盆地期。通过探讨多期应力场作用下四棵树凹陷的构造演化特征,进一步深入认识了此类含油气盆地整体构造格局的变动过程,也为研究区油气资源下一步勘探提供了新思路。[Objective]The Sikeshu Sag of the southern Junggar Basin is tectonically located in the western thrust belt of the North Tianshan Mountains.The basin has undergone multiple stages and multidirectional tectonic movements since the Palaeozoic.Clarifying the structural characteristics and evolutionary process of the structural system in the study area is critical for petroleum exploration and development in such petroliferous basins.[Methods]Utilizing the seismic data interpretation and the outcrop geological investigation of the Sikeshu Sag,spatial-temporal variations in the structural patterns and stress fields were revealed,and a tectonic evolution model was established.[Results]This study indicates that the compressional inversion and strike-slip structures were widely developed in the deep-buried layers of the Sikeshu Sag,but the thrust and decollement structures were more prevail in the shallow layers of the Sikeshu Sag.According to the structural style,the Sikeshu Sag can be divided into the southern compressional fault-fold belt,central strike-slip compressive-torsional belt,and northern uplift belt.The Sikeshu Sag experienced two periods of strong tectonic uplift,corresponding to the peak period of two stages of fault activity.The tectonic environment and stress field conditions underwent multiple changes:the NNW-SSE extension driven by the back-arc rifting during the late Carboniferous to early-middle Permian,the rift-depression transition triggered by the NNW-SSE extrusion of the Zaire orogenic movement during the late Permian to Triassic,the regional depression induced by the NNW-SSE extrusion of the peripheral orogenic belt and Chepaizi uplift during the late Jurassic to Palaeogene,and the reactivation of foreland caused by NS extrusion of North Tianshan Mountains during the Neogene.[Conclusion]This study explores the tectonic evolution of the Sikeshu Sag under multiphase stress fields,which favors the better understanding of the overall tectonic pattern changes in similar petroliferous basins and provi

关 键 词：准噶尔盆地南缘 四棵树凹陷 山前冲断带 构造系统 构造演化 应力场 

分 类 号：P618.13[天文地球—矿床学]