| 摘要: |
| 本文应用回剥法及地层骨架厚度不变模型对苏北盆地高邮凹陷沉积地层进行了去压实校正,利用声波时差及镜质体反射率法对三垛期末盆地剥蚀量进行恢复,用艾里公式对盆地的构造沉降量及总沉降量进行估算,进而对苏北盆地高邮凹陷晚白垩世-新生代沉降史进行分析。研究表明:高邮凹陷为典型的裂陷盆地,经过了拗断期-断拗期-断陷期-坳陷期的盆地演化阶段。演化过程经历了三期沉降和两期隆升。在不同的阶段凹陷的沉降中心略有不同,其受主边界断层的控制,围绕着边界断层呈串珠状分布。 |
| 关键词: 高邮凹陷 晚白垩世-新生代 剥蚀量 沉降史 构造演化 |
| DOI： |
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| Tectonic subsidence and evolution of the Gaoyou depression in northern Jiangsu Basin during the Late Cretaceous to the Cenozoic |
| NENG Yuan, YANG Qiao, ZHANG Ke-xin, REN Hong-min, ZHENG Yuan-cai |
(1. State Key Laboratory of Petroleum Resources and Exploration, China University of Petroleum, Beijing 102249, China;
2. College of Resources and Information, University of Petroleum, Beijing 102249, China;
3. International Research Center, PetroChina, Beijing 100034, China;
4. Research Institute of Geological Sciences, Jiangsu Oil Field Company, SINOPEC, Yangzhou 225009, Jiangsu, China) |
| Abstract: |
| The analysis of the subsidence history of the Gaoyou depression in northern Jiangsu basin during the Late Cretaceous to the Cenozoic is concerned with the decompaction correction based on the backstripping method and stratigraphic framework thickness model of the sedimentary strata in the Gaoyou depression,estimation of the thickness of the denudational strata in the depression during the latest Sanduoan based on the time difference of acoustic waves and vitrinite reflectivity,and calculation of the tectonic subsidence and total subsidence in the depression based on the Airy isostasy hypothesis.The results of research show that the Gaoyou depression is a typical rift basin,and has gone through the evolutionary stages of downwarping-faulting,faulting-downwarping,and rift faulting-downwarping,including three phases of subsidence and two phases of uplifting.The depocenters in individual stages are all controlled by main boundary faults,and display a beaded alignment around the boundary faults. |
| Key words: Gaoyou depression Late Cretaceous-the Cenozoic denudational thickness subsidence history tectonic evolution |
