柴达木盆地北缘东段石炭系残留分布及控制因素

发布时间：2018-03-08 00:06

  本文选题：控制因素　切入点：构造演化　出处：《地学前缘》2016年05期 　论文类型：期刊论文

【摘要】：柴达木盆地北缘东段石炭系是侏罗系之外的另一套有利生烃层系,针对前人"石炭系为广泛分布于柴达木盆地各残留凹陷"的普遍认识与实际钻探不相符的矛盾,笔者充分利用野外地质调查、钻井、地震、电法等成果资料,通过露头引层、钻井标定、地震相与速度谱识别等方法手段,进行了石炭系顶底界面的追踪解释,重新厘定了柴北缘东段石炭系残留地层分布,并通过平衡剖面恢复分析了自古生代以来的构造演化特征及其对石炭系残留分布的控制作用。结果表明,柴达木盆地东部石炭系平面上残留分布于西段的尕丘凹陷和东段的欧南、霍布逊、德令哈等凹陷,发育尕丘、欧南、霍布逊等多个厚度中心;西段尕西—鱼卡凹陷、马海大红沟凸起、大柴旦凹陷、红山—小柴旦凹陷等基本无石炭系残留;印支末期构造运动造成不同构造单元的差异隆升剥蚀是控制石炭系残留分布及其厚度差异的主要因素,燕山晚期和喜山晚期构造运动造成残留分布的分隔性较强。
[Abstract]:Carboniferous in the eastern section of the northern margin of the Qaidam Basin is another set of favorable hydrocarbon-generating strata outside the Jurassic. In view of the contradiction between the common understanding of the Carboniferous system widely distributed in the residual sag of the Qaidam Basin and the actual drilling, the Carboniferous system is widely distributed in the Qaidam Basin. The author makes full use of the field geological survey, drilling, earthquake, electric method and so on. By means of outcrop lead layer, drilling calibration, seismic phase and velocity spectrum identification and so on, the authors have carried out the tracing interpretation of the top and bottom interface of the Carboniferous system. The distribution of the Carboniferous residual strata in the eastern part of the northern margin of Qaidam is redefined, and the structural evolution characteristics since Paleozoic and their controlling effect on the residual distribution of the Carboniferous system are analyzed through the restoration of the equilibrium profile. In the east of the Qaidam Basin, the Carboniferous remains in the Gaqiu Sag in the west and in the East part of the Gaiqiu Sag, Hoboxun, Delingha Sag, and other thickness centers, such as Gaqiu, Ernan and Hobson, and the West Gaxi-Yuka Sag, There is basically no Carboniferous residue in the Mahai Dahonggou uplift, Dachaidan sag and Hongshan-Xiaochaidan sag, and the difference in uplift and denudation caused by the late Indosinian tectonic movement is the main factor controlling the residual distribution and thickness difference of the Carboniferous system. The late Yanshanian and late Himalayan tectonic movements resulted in strong separation of residual distribution.
【作者单位】： 中国石化胜利油田分公司勘探开发研究院;中国石化胜利油田分公司勘探开发研究院西部分院;
【基金】：中国地质调查局项目“柴达木盆地油气资源潜力评价”(1212010818054);中国地质调查局项目“柴达木盆地古生代油气资源调查评价”(1212011120964) 中国石化重大专项“西部挤压盆地山前带综合建模研究与目标评价”(P11077)
【分类号】：P618.13;P534.45
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本文编号：1581539