| 柴北缘东段构造应力场数值模拟及构造演化模式探讨 |
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| 引用本文： | 商琳,戴俊生,杨学君,夏瑞杰.柴北缘东段构造应力场数值模拟及构造演化模式探讨[J].高校地质学报,2014,20(2):260. |
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| 作者姓名： | 商琳 戴俊生 杨学君 夏瑞杰 |
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| 作者单位： | 中国石油大学地球科学与技术学院;中国石油天然气集团公司塔里木油田分公司勘探开发研究院;中海石油(中国)有限公司天津分公司; |
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| 基金项目： | 国家重大科技专项“中西部前陆盆地构造地质、储层特征与有利区评价”(2011ZX05003-04);“中央高校基本科研业务费专项资金”(12CX06004A)联合资助 |
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| 摘 要： | 为了明确柴北缘东段晚古生代至中生代的构造演化历史,探讨石炭系—侏罗系地层缺失的原因,本文应用有限单元 法 模 拟 了 柴 北 缘 东 段 印 支 期 ( 三 叠 纪 )、 燕 山 早 期 ( 侏 罗 纪 )、 燕 山 晚 期 ( 白 垩 纪 ) 的 构 造 应 力 场 , 分 析 了 该 区 不 同 时 期 的 主应力与剪应力分布特征。根据库仑及格里菲斯岩石破裂准则预测了古构造的存在并探讨了地层缺失的原因。研究结果表 明:三叠纪,柴北缘东段在印支期不均匀分布的最大主应力与右旋剪应力共同作用下,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,在燕山早期拉张应力场作用下,由早—中侏罗世的断陷盆地 逐渐演化为晚侏罗世的坳陷盆地,欧南地区为继承性隆起区未接受沉积;白垩纪,受晚期燕山运动影响,应力场逐渐由拉 张转变为挤压,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,柴 北缘东段中生代盆地演化终止。
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| 关 键 词： | 柴达木盆地北缘 构造应力场 数值模拟 构造演化 |
Numerical Simulation of the Tectonic Stress Field and Tectonic Evolution Pattern of the Eastern Section of North Qaidam |
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| SHANG Lin,DAI Junsheng,YANG Xuejun,XIA Ruijie.Numerical Simulation of the Tectonic Stress Field and Tectonic Evolution Pattern of the Eastern Section of North Qaidam[J].Geological Journal of China Universities,2014,20(2):260. |
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| Authors: | SHANG Lin DAI Junsheng YANG Xuejun XIA Ruijie |
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| Abstract: | In order to analyze tectonic evolution of the eastern section of North Qaidam from the Late Paleozoic to Mesozoic and explore the reasons for the lack of Carboniferous-Jurassic strata, this study uses the finite element method to simulate tectonic stress field of Indosinian (Triassic), Early Yanshanian (Jurassic), late Yanshanian (Cretaceous) in the eastern section of North Qaidam. The characteristics of principal stress and shear stress distribution of this area in different periods have been analyzed. According to the Coulumb and Griffith fracture principles, the ancient structures have been predicted and the reasons for the lack of strata have been identified. The results are as follows. The eastern section of North Qaidam formed two rows of nearly east-west trending anticline in Triassic, which was affected by the uneven distribution of the principal stress and dextral shear of Indosinian orogeny. It resulted in the erosion of strata in various regions from Carboniferous to Permian. Under the action of tensile stress field of early Yanshanian in Jurassic, the fault basin evolved into a depression basin from the Early-Middle Jurassic to the Late Jurassic. The Ounan area, which was an inherited uplift, had not deposited. The stress field gradually transformed from tensile into compression in late Yanshanian during the Cretaceous, leading to tectonic inversion and revival of thrust faults. As a result, the mountains such as Lvliang, Xitie, Amunike, Olongbluk uplifted under the control of reactivity of thrust faults and the Mesozoic basin evolution in the eastern section of North Qaidam ended. |
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| Keywords: | North Qaidam tectonic stress field numerical simulation tectonic evolution |
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