柴达木盆地北缘东段石炭纪至白垩纪构造演化模式及地层缺失原因探讨  

Study on Tectonic Evolution Pattern from Carboniferous to Cretaceous and Stratum Loss Reasons of the Eastern Section of North Qaidam

作　　者：商琳 戴俊生 夏瑞杰 王锋 叶志达 

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266580 [2]中海石油(中国)有限公司天津分公司,天津300451 [3]中国石油塔里木油田分公司勘探开发项目经理部,新疆库尔勒841000

出　　处：《地质论评》2014年第4期780-790,共11页Geological Review

基　　金：国家重大科技专项课题"复杂裂缝性碳酸盐岩油藏开发关键技术"(编号2011ZX05014-004);中央高校基本科研业务费专项资金(编号12CX06004A)资助的成果

摘　　要：为了明确柴达木盆地北缘东段石炭纪至白垩纪盆地演化历史,分析石炭系—侏罗系缺失的原因,本文重新确定了石炭系和侏罗系残余地层分布范围,并根据平衡剖面恢复和断裂落差计算,分析了主要断裂的活动特征,提出了柴北缘东段石炭纪至白垩纪的构造演化模式。应用有限单元法模拟了柴北缘东段印支期(三叠纪)、燕山早期(早—中侏罗世)、燕山晚期(晚侏罗世—白垩纪)的应力场,对构造演化模式加以验证。研究结果表明:柴北缘东段自石炭纪至白垩纪经历了石炭纪—二叠纪伸展、三叠纪挤压褶皱、早—中侏罗世断陷、晚侏罗世—白垩纪早期挤压坳陷和白垩纪末挤压反转五个构造演化阶段。三叠纪,柴北缘东段在印支期发育两排近东西走向的背斜凸起,造成石炭系—二叠系在各地区遭受不同程度的剥蚀;侏罗纪—白垩纪早期,欧南地区为继承性隆起区,未完全接受沉积;白垩纪末,受燕山晚期旋回影响,构造反转,逆冲断裂复活,绿梁山、锡铁山、埃姆尼克山、欧隆布鲁克山等主要山体隆升,遭受剥蚀。In order to analyze basin evolution of the eastern section of North Qaidam from Carboniferous to Cretaceous and explore the reasons for the lack of Carboniferous-Jurassic,the paper,based on identifying distribution of residual Carboniferous and Jurassic,balanced cross-section and fault throw,analysised the characteristics of the activities of major faults and proposed tectonic evolution pattern from Carboniferous to Cretaceous.Using the finite element method to simulate tectonic stress field of Indosinian （T）,early Yanshanian （J1-J2）,late Yanshanian （J3-K） in the eastern section of North Qaidam,tectonic evolution of the model has been validated.The results indicated as follows,the eastern section of North Qaidam experienced expansion within Carboniferous and Permian,extrusion uplift within Triassic,fault basin within the period of early Jurassic to middle Jurassic,depression basin within Late Jurassic and extrusion inversion within Cretaceous.In Triassic：The eastern section of North Qaidam formed two rows of nearly east-west trending anticline which resulted in the erosion of stratum in various regions from Carboniferous to Permian.From Jurassic to Early Cretaceous：The Ounan area,which was an inherited uplift,had not fully deposited.In Late Cretaceous：The stress field gradually transformed from tensile into compressive in late Yanshanian,leading to tectonic inversion and the revival of thrust faults.As a result,the mountains such as Lvliang,Xitie,Amunike,Olongbluk uplifted under the control of re-activity of thrust faults.

关 键 词：柴达木盆地北缘 残余地层分布 构造演化模式 构造应力场 数值模拟 

分 类 号：P534[天文地球—古生物学与地层学] P548[天文地球—地质学]