| 鄂尔多斯盆地西北缘浩然柴达木地区下白垩统结构特征 |
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| 引用本文： | 李茂,吴旭亮.鄂尔多斯盆地西北缘浩然柴达木地区下白垩统结构特征[J].铀矿地质,2021(1):105-111. |
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| 作者姓名： | 李茂 吴旭亮 |
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| 作者单位： | 核工业航测遥感中心;中核集团铀资源地球物理勘查技术中心（重点实验室） |
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| 基金项目： | 中国核工业地质局“鄂尔多斯盆地北缘伊和乌素地区CSAMT测量”项目(编号:201902-05)资助。 |
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| 摘 要： | 鄂尔多斯盆地西北缘下白垩统为重要的找矿目的层,通过研究该套层位的结构特征,以期大致查明其深部发育情况,为盆地北部铀矿资源勘查与评价提供基础资料。文章通过对研究区可控源音频大地电磁(CSAMT)测深数据的反演处理,获得了沉积盖层的电性结构模型,结合区内地质、岩石物性及钻孔资料综合分析,认为下白垩统由浅至深主要发育两层地电结构,上部罗汉洞组纵向反映为明显的"上高下低"相对中高阻电性层,底板埋深一般在200 m左右;下部华池-环河组与洛河组整体反映为相对高阻电性层,底板埋深500~950 m,厚度400~700 m,走向北西,总体表现为北东部薄、南西部厚、中部更厚的沉积分布特征。
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| 关 键 词： | CSAMT 下白垩统 结构特征 浩然柴达木 |
Structural Characteristics of Lower Cretaceous in Haoran-Chaidam Area,Northwestern Margin of Ordos Basin |
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| LI Mao,WU Xuliang.Structural Characteristics of Lower Cretaceous in Haoran-Chaidam Area,Northwestern Margin of Ordos Basin[J].Uranium Geology,2021(1):105-111. |
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| Authors: | LI Mao WU Xuliang |
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| Institution: | (Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang 050002,China;CNNC Key Laboratory for Geophysical Exploration Technology Center of Uranium Resource,Shijiazhuang 050002,China) |
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| Abstract: | The Lower Cretaceous in the northwestern margin of Ordos Basin is an important prospecting target layer.Study on the layer structure is to roughly find out its deep development characteristics,and help the uranium exploration and resource evaluation.The electrical structure model of sedimentary covers was obtained by inversing the CSAMT sounding data.By the comprehensive analysis of geology,petrophysical property and borehole data,the Lower Cretaceous was believed to have two electrical structure layers.The upper Luohandong Formation is longitudinally reflected as a medium resistivity layer of“high in shallow and low in deep”feature with a floor depth about 200 m,while the lower Huachi-huanhe Formation and Luohe Formation are reflected as high resistivity layers with the floor depth of 500~950 m and 400~700 m thickness.The layer trends northwest ward,which is most thick in the center,thin in the northeast and thick in the southwest. |
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| Keywords: | Haoran-chaidamu CSAMT Lower Cretaceous Stratigraphic structure |
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