论文部分内容阅读
针对“973”项目中“南海大陆边缘动力学与油气资源潜力”这一研究课题,对在南海南部陆缘礼乐盆地采集的NH973-2测线进行了研究.对地震剖面的解释共划分出6个层序界面,将地层划分为4个构造沉积单元.根据地震解释,对不同时期断层的水平断距进行了测量及分析,获取了与脆性拉张相关的伸展信息:研究区的拉张作用可以分为2期,主要的拉张作用发生在大陆裂谷阶段(古近纪),形成了一系列的地堑-半地堑以及翘倾断块;第2期拉张作用的时期为晚渐新世-早中新世,断层活动强度明显变弱.在南海南部陆缘广泛发育了碳酸盐沉积,其发育的时代和南海的海底扩张时期一致.对穿越礼乐滩区地震剖面伸展特征的分析表明,根据断层水平断距获得脆性伸展因子与根据重力反演获得的全地壳伸展因子之间存在差异,表明研究区的拉张在纵向上并非是均一的,新生代的拉张经历了深度决定拉张模式.
Aiming at the research topic “The edge dynamics of the South China Sea and the potential of oil and gas resources” in the “973 ” project, the NH973-2 survey line collected from the Riyue Basin in the southern South China Sea was studied. Interpretation A total of 6 sequence boundaries are divided into four tectonic sedimentary units.According to seismic interpretation, the horizontal interval between faults in different periods is measured and analyzed, and the extension information related to brittle tension is obtained: The stretching of the area can be divided into two phases, the main stretching occurred in the continental rift stage (Paleogene), forming a series of graben - semi-graben and upturned block; The period of action was Late Oligocene to Early Miocene, and the intensity of fault activity was obviously weakened.Carbonate deposition was extensively developed in the southern margin of the South China Sea, and its developmental period coincided with the time of submarine expansion in the South China Sea. The analysis of the extensional characteristics of the seashore section shows that the difference between the brittle extensibility factor obtained from the horizontal fault interval and the crustal extension factor obtained from gravity inversion shows that the tension in the study area is not uniform in the longitudinal direction. On behalf of the tension experienced Depth decided to pull mode.