埕北凹陷古近系构造对沉积的控制作用

发布时间：2018-05-24 08:08

本文选题：构造演化 + 构造坡折带　；参考：《东北石油大学学报》2017年04期

【摘要】：利用埕北凹陷钻井、录井、测井、地震资料等,分析研究区古近系构造结构特征,恢复古近纪构造演化,划分沉积相类型,研究沉积体系的时空展布规律,明确古近系构造对沉积的控制作用。结果表明:埕北凹陷古近系发育的NW向断裂控制研究区凸凹格局,NE、NEE向断裂改造NW向构造格局。埕北凹陷古近纪构造演化分为三个阶段,继承断陷期(Ek-Es4)表现为"窄盆、浅水"环境,主要发育扇三角洲沉积;断陷扩张期(Es3)表现为"深盆、深水"环境,以发育半深湖—深湖沉积为主;断—坳转换(Es2-Ed)早期表现为"广盆、深水"环境,以发育半深湖—深湖沉积为主,晚期表现为"广盆、浅水"环境,主要发育辫状河三角洲与曲流河三角洲沉积。研究区古近系发育陡坡断裂坡折带、缓坡断裂坡折带及洼陷边缘型坡折带三种类型,其中陡坡断裂坡折带主要发育扇三角洲沉积,缓坡断裂坡折带主要发育辫状河三角洲与曲流河三角洲沉积,洼陷边缘型坡折带主要发育巨厚的湖相沉积及少量湖底扇沉积。该结果为研究区古近系油气勘探提供指导。
[Abstract]:Based on the drilling, logging, logging and seismic data in Chengbei sag, the structural characteristics of Paleogene in the study area are analyzed, the tectonic evolution of Paleogene is restored, sedimentary facies are classified, and the temporal and spatial distribution of sedimentary system is studied. The control of Paleogene tectonics on sedimentation is clarified. The results show that the NW-trending tectonic pattern developed in the Paleogene of Chengbei Sag is altered by the NE-trending faults. The Paleogene tectonic evolution of Chengbei depression can be divided into three stages, the succession of Ek-es _ 4 in fault depression is characterized by a "narrow basin, shallow water" environment, and the fan-delta deposits are mainly developed, and the "deep basin, deep water" environment in the extension period of the fault depression is characterized by "deep basin, deep water" environment. In the early stage, the "wide basin, deep water" environment was found in the fault-depression transformation, and the semi-deep lacustry-deep lake sediments were developed in the early stage, and in the late stage, "wide basin, shallow water" environment. Braided river delta and meandering river delta are mainly developed. The Paleogene developed three types of steep slope break zone, gentle slope break zone and depression marginal slope break zone, among which fan delta deposits were mainly developed in steep slope break zone. Braided river deltas and meandering river deltas are mainly developed in the slope break zone of gentle slope fault, while the lacustrine facies deposits and a few sublacustrine fan deposits are mainly developed in the marginal slope break zone of the depression. The results provide guidance for the exploration of Paleogene oil and gas in the study area.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中海石油(中国)有限公司北京研究中心;
【基金】：国家科技重大专项(2016ZX05024-002-001) 中央高校基本科研业务费专项资金项目(16CX06043A)
【分类号】：P512.2;P618.13

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