| 鄂尔多斯盆地上三叠统延长组长8段液化柱及相关软沉积物变形 |
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| 引用本文： | 贺静,冯胜斌.鄂尔多斯盆地上三叠统延长组长8段液化柱及相关软沉积物变形[J].地质学报,2017,91(3):645-657. |
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| 作者姓名： | 贺静 冯胜斌 |
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| 作者单位： | 长庆油田勘探开发研究院,长庆油田勘探开发研究院 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）,国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 笔者在鄂尔多斯盆地上三叠统延长组长8段的岩芯中首次识别出液化柱变形构造,本文从三维空间研究其宏观与微观特征。赋存液化柱的长8段的多个层位的岩芯中均发现有软沉积物变形构造,如液化流动变形、水塑性变形及脆性变形等,广泛分布于盆地不同地区的钻井岩芯中,并在垂向上重复出现。结合长8段的沉积环境和构造背景分析,笔者认为长8段的液化柱与软沉积物变形系地震触发。晚三叠世鄂尔多斯盆地以南秦岭地震造山运动与盆地沉陷是长8段软沉积物变形的构造背景。根据地震触发软沉积物变形构造的时空分布,鄂尔多斯盆地在长8段沉积的地质时期已受控于秦岭造山带动力机制的控制,而不是传统认为的仅在长8段沉积末期。
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| 关 键 词： | 鄂尔多斯盆地 上三叠统长8段 液化柱 软沉积物变形 秦岭造山带 |
| 收稿时间： | 2016/5/11 0:00:00 |
| 修稿时间： | 2016/8/19 0:00:00 |
The Liquefied Pillars and Other SSDS of the 8th Member of the Upper Triassic Yanchang Formation in the Ordos Basin |
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| Hejing and fengshengbin.The Liquefied Pillars and Other SSDS of the 8th Member of the Upper Triassic Yanchang Formation in the Ordos Basin[J].Acta Geologica Sinica,2017,91(3):645-657. |
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| Authors: | Hejing and fengshengbin |
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| Institution: | Exploration and Development Research Institute of Changqing Oilfield Company,Exploration and Development Research Institute of Changqing Oilfield Company |
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| Abstract: | The deformation structure of liquefied pillar was first identified in the cores from the 8th section of the Yanchang Formation of the Upper Triassic in the Ordos Basin. Both the macroscopic and microscopic characteristics of the liquefied pillar were studied in this paper. Soft sediment deformation structures (SSDS) such as the liquefied SSDS, hydroplastic SSDS and some brittle SSDS have been found in many different locations of the cores from the 8th section of the Yanchang Formation. Sometimes they repeated vertically in the cores. Based on the analysis of the sedimentary environment and tectonic background, the authors propose that the triggering mechanism of the forming of these SSDS is the seismic shaking originated from the Qinling orogenic process since the late Triassic. According to the temporal and spatial distribution of these seismic SSDS, it can be concluded that the Ordos Basin had been controlled by the dynamic mechanism of the Qinling Mountains orogenic belt throughout the entire period of the 8th section of the Yanchang Formation, not only in the late period of the 8th section of the Yanchang Formation. |
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| Keywords: | Ordos Basin the 8th section of the Yanchang Formation of the Upper Triassic liquefied pillar Soft sediment deformation structure (SSDS) the Qingling Orogenic belt |
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