| 鄂尔多斯盆地前侏罗纪古地貌形成演化及沉积充填特征 |
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| 引用本文： | 李元昊,杨桂茹,彭建,郑亚军,王茜,何拓平. 鄂尔多斯盆地前侏罗纪古地貌形成演化及沉积充填特征[J]. 世界地质, 2020, 39(1): 56-71 |
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| 作者姓名： | 李元昊 杨桂茹 彭建 郑亚军 王茜 何拓平 |
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| 作者单位： | 西安石油大学地球科学与工程学院,西安710065;陕西省油气成藏地质学重点实验室(西安石油大学) ,西安710065;中国石油勘探开发研究院廊坊分院,河北廊坊,065007;中国石油长庆油田分公司第十采油厂,甘肃庆城,745100 |
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| 基金项目： | 国家科技重大专项(2016ZX05050006,2016ZX05047);西安石油大学科研创新团队建设计划(2013KYCXTD03)联合资助。 |
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| 摘 要： | 采用河流阶地、河谷形态和残余厚度等方法,结合地震和钻井资料,恢复了鄂尔多斯盆地前侏罗纪古地貌形成演化阶段及其特征。结果表明,三叠纪末期盆地主要经历了两次特征不同的构造抬升侵蚀过程,第一次为整体性均衡抬升,抬升侵蚀作用较强;第二次为宽缓V字型不均衡抬升,抬升侵蚀作用相对较弱。前侏罗纪古地貌的形成是晚印支构造运动的侵蚀响应,根据抬升期次晚印支运动可以分为两个亚幕。随着抬升侵蚀的结束,古地貌中河谷首先开始了沉积充填,先后沉积了限制性河谷环境的富县组和半限制河谷环境的延安组延10段河流相地层。
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| 关 键 词： | 鄂尔多斯盆地 前侏罗纪古地貌 晚印支运动 限制性河谷 |
Formation and evolution of pre-Jurassic palaeogeomorphology and characteristics of sedimentary filling in Ordos Basin |
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| LI Yuan-hao,YANG Gui-ru,PENG Jian,ZHENG Ya-jun,WANG Xi,HE Ta-ping. Formation and evolution of pre-Jurassic palaeogeomorphology and characteristics of sedimentary filling in Ordos Basin[J]. Global Geology, 2020, 39(1): 56-71 |
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| Authors: | LI Yuan-hao YANG Gui-ru PENG Jian ZHENG Ya-jun WANG Xi HE Ta-ping |
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| Affiliation: | (School of Earth Sciences and Engineering,Xi an Shiyou University,Xi an 710065,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology(Xi an Shiyou University),Xi an 710065,China;Langfang Branch of Research Institute of Petroleum Exploration and Development,PetroChina,Langfang 065007,Hebei,China;The Tenth Oil Plant of Changqing Oilfield Company,PetroChina,Qingcheng 745100,Gansu,China) |
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| Abstract: | The formation and evolution of pre-Jurassic palaeogeomorphology in Ordos Basin was restored using the river terraces,valley shape and residual thickness in combination with seismic and drilling data.The results showed that Ordos Basin experienced two different large-scale tectonic events associated with uplift and erosion in Late Triassic,of which the first one was equilibrium uplift,with strong erosion,while the second one was broad and gentle V-type disequilibrium uplift,with relatively weak erosion.The formation of pre-Jurassic palaeogeomorphology was the erosion response to the Late Indosinian tectonic movement,which can be divided into two sub-episodes.With the ending of uplift erosion,valleys were filled with sediments,starting with the confined valley fill of Fuxian Formation,followed by the semi-confined valley fill of Yan10 section of Yan an Formation. |
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| Keywords: | Ordos Basin pre-Jurassic palaeogeomorphology Late Indosinian movement confined valley |
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