ORIGIN AND EVOLUTION OF THE SHUANGFENG BASIN OF THE SOUTH CHINA SEA AND THEIR CONSTRAINTS ON STRUCTURAL STYLES
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摘要:
南海北部深水区已逐渐成为我国南海北部油气资源调查的热点区域，开展南海北部双峰盆地构造样式及成因分析研究对进一步认识南海北部沉积盆地的形成演化和评价油气资源潜力具有重要的借鉴意义。利用广州海洋地质调查局已有的二维地震资料，在对双峰盆地地震层序和构造精细解释的基础上，厘定了双峰盆地主要的构造样式；采用平衡剖面技术，重建了双峰盆地的构造演化史；结合南海北部区域构造背景，分析了双峰盆地的性质和成因。研究认为，双峰盆地为与洋壳热沉降有关的坳陷沉积盆地。从神狐运动开始，双峰盆地经历了大陆破裂—大陆裂解—海底扩张完整的构造演化旋回，在持续伸展构造应力场的作用下，形成了双峰盆地，主要发育伸展构造样式、转换-伸展构造样式、重力滑动构造样式和火成构造样式4类，其中伸展构造和火成构造较为发育。
Abstract:The deep-water area of the northern South China Sea, i.e the Shuangfeng Basin in other words, has gradually become a hot spot for oil and gas exploration. Over the others, it is of great significance to carry out the study of structural style so as to know better about the origin and evolution of the basin. Using the 2D seismic data from Guangzhou Marine Geology Survey, the main structural styles of Shuangfeng Basin are determined based on the detailed interpretation of seismic sequences and structures. The structural evolutionary history of the Shuangfeng Basin is then reconstructed with the technique of balanced section. The nature and genesis of Shuangfeng Basin are also analyzed together with regional tectonic background in the north of South China Sea. It is revealed that the Shuangfeng Basin is a depression related to thermal subsidence of oceanic crust. Since the Shenhu movement, the basin has experienced a complete tectonic cycle from continental fracturing, through continental disintegration to seafloor spreading. The Shuangfeng Basin is formed under the action of continuous extensional tectonic stress. There are four types of extensional structural styles: extensional, transition-extensional, gravity sliding structure, and igneous structures.
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Key words:
- structural style /
- genetic analysis /
- Shuangfeng Basin /
- South China Sea
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