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

发布时间：2018-01-05 01:20

本文关键词：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　出处：《地质学报》2017年03期 　论文类型：期刊论文

【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。
[Abstract]:In the core of Yanchang 8 member of Upper Triassic in Ordos Basin, the deformation structure of liquefaction column was identified for the first time. In this paper, the macroscopic and microcosmic characteristics of liquefaction column are studied. Soft sediment deformation structures, such as liquefaction flow deformation, hydroplastic deformation and brittle deformation, are found in the cores of the long 8 member of the liquefaction column. It is widely distributed in drilling cores in different areas of the basin and repeated in vertical direction. The sedimentary environment and tectonic background of Chang 8 member are analyzed. The authors consider that the liquefaction column and soft sediment deformation system of Chang 8 is triggered by earthquakes. The seismic orogenic movement and basin subsidence in the Qinling Mountains south of the late Triassic Ordos Basin are the tectonic background of the deformation of the soft sediment in the Chang 8 member. Temporal and spatial distribution of deformation structures of soft sediments. The sedimentary geological period of the Ordos Basin in the Chang8 member is controlled by the dynamic mechanism of the Qinling orogenic belt, rather than the traditional view that it is only in the late stage of the Chang 8 formation.
【作者单位】：长庆油田公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;
【基金】：国家重点基础研究发展计划“973”项目(编号2014CB239003) 国家自然科学基金重大项目(编号41390451)联合资助的成果
【分类号】：P618.13;P534.51
【正文快照】： 注:本文为国家重点基础研究发展计划“973”项目(编号2014CB239003)和国家自然科学基金重大项目(编号41390451)联合资助的成果。液化柱型震积岩是地震触发软沉积物砂层垂直向下伏层液化形成的柱状体(Low and Lopiccolo,1974;Moretti et al.,1999;Bowman et al.,2004;Foix et a

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