渤中凹陷古近纪控盆断裂的活动速率与沉积响应

发布时间：2018-01-18 09:27

  本文关键词：渤中凹陷古近纪控盆断裂的活动速率与沉积响应　出处：《海洋地质与第四纪地质》2016年04期 　论文类型：期刊论文

  更多相关文章： 断裂 活动速率 沉积体系 古近纪 渤中凹陷

【摘要】：渤中凹陷是整个渤海湾盆地的沉积和沉降中心,古近纪时期被石臼坨凸起、沙垒田凸起、渤南低凸起、渤东低凸起所环绕。凸起与凹陷之间因控盆断裂发育程度及活动速率的差异,形成复杂的构造带与沉积体系。在地震精细解释基础上,计算主要边界断裂在不同时期的活动速率,并与相应时期平面沉积体系的展布特征相对比。结果表明,渤中地区古近纪的控盆断裂活动速率峰值出现在沙三段和东三段沉积时期,凹陷处于强烈断陷期,且因平面上不同位置断裂活动强度的差异,凹陷在空间上并非呈简单的"平底锅"形态。盆缘碎屑沉积体系类型明显受控于断裂内侧的基底沉降速率,并随活动速率的大小变化而发生退积或进积。与环渤海湾陆上油田所处各凹陷古近纪的构造沉积演化相比,在东三段沉积期发生的最强烈断陷和在东二上-东一段沉积期发生断坳转换以后,成为整个渤海湾盆地远源三角洲的进积中心,是渤中凹陷古近纪构造沉积演化方面最突出的特征。
[Abstract]:Bozhong sag is the sedimentary and subsidence center of the whole Bohai Bay basin. It was raised by Shiyutuo, Shalieda and Bonan low uplift in Paleogene. The complex tectonic belt and sedimentary system formed between the uplift and the depression because of the difference of the development degree and activity rate of the fault in the controlling basin, and on the basis of the detailed seismic interpretation. The activity rates of the main boundary faults in different periods are calculated and compared with the distribution characteristics of the plane sedimentary systems in the corresponding periods. In the Paleogene of Bozhong area, the peak rate of faulting activity occurred in the sedimentary period of the third member of Sha 3 and the third member of the east part, and the depression was in the period of strong fault subsidence, and the intensity of fault activity varied in different positions on the plane. The sag is not a simple "pan" form in space. The type of detrital sedimentary system in the basin margin is obviously controlled by the rate of basement subsidence inside the fault. And with the change of the activity rate, the deposition or precession occurs, which is compared with the tectonic sedimentary evolution of Paleogene in the depression located in the Bohai Bay onshore oil field. After the strongest fault depression occurred in the sedimentary period of the third member of the eastern part and the fault-depression transition occurred during the sedimentary period of the upper and eastern part of the East second member, it became the precession center of the far source delta of the whole Bohai Bay basin. It is the most prominent feature of Paleogene tectonic sedimentary evolution in Bozhong sag.
【作者单位】： 中国石油大学(华东)地球科学与技术学院;大庆油田采油八厂;中海石油(中国)有限公司天津分公司;
【基金】：国家“十二五”科技重大专项“渤中凹陷油气成藏规律及勘探方向研究”(2011ZX05023-001-013)
【分类号】：P736.1
【正文快照】： 渤中凹陷是渤海湾盆地的沉积和沉降中心,也是整个渤海湾盆地最大的含油气凹陷[1-2]。受勘探程度的限制,尽管从20世纪80年代以来,陆续有学者对渤中凹陷古近系的构造和沉积演化进行了研究[3-6],但在研究范围或研究程度上都存在明显不足。近年来随着钻井数量的迅速增多和三维地震，

本文编号：1440357