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本文在综合解释中建南盆地重、磁、地震资料的基础上,阐明盆地的地质构造特征,划分对比地震层序,应用地震相解释等手段分析新生代沉积特征,利用实际资料讨论南海西缘断裂以及盆地的断裂系统与基底属性,初步探讨盆地的成因及构造演化,进而阐述其油气远景。根据界面的不整合标志,划分对比了T_1、T_2、T_6、T_g四个反射界面,相应地分为T_6-T_g(早第三纪)、T_2-T_6(晚渐新世末-中中新世)和T_0(海底)-T_2(晚中新世-第四纪)三套沉积层序。新生代沉积层具有从老到新由河湖相发展到海陆过渡相并逐渐海侵为广海相的沉积特征。盆地位于南海西部的走滑断裂带以东、在南海北部陆缘拉张和西缘剪切活动的构造背景下形成。主要发育北东、北西、南北向等几组断裂系,不同方向的断裂互相截切、错断。南北向断裂系是南海西缘断裂的一部分,在地形、地貌和重磁异常特征上都有明显标志,地震剖面显示其具有走滑断裂的特征。盆内划分出一隆两坳和一个断阶带等次级构造单元。油气地质条件的分析展示了盆地潜在的含油气远景。
Based on the comprehensive interpretation of the data of heavy, magnetic and seismic in Zhongjiannan Basin, this paper elucidates the geological structural features of the basin, divides the sequence of the seismic series and interprets the Cenozoic sedimentary features by means of seismic facies interpretation and so on. Based on the actual data, Faults and the fault systems and basement attributes of the basin, and to discuss the genesis and tectonic evolution of the basin and further elaborate its oil and gas prospect. According to the unconformity interface of the interface, the four reflection interfaces T_1, T_2, T_6 and T_g are divided and divided into T_6-T_g (Early Tertiary), T_2-T_6 (late Oligocene-Miocene) ) And T_0 (seafloor) -T_2 (Late Miocene-Quaternary) sedimentary sequence. The Cenozoic sediments have the sedimentary characteristics from the old to the new sedimentary facies, which developed from the lacustrine facies to the land-sea transition facies and gradually transgressed into the Guanghai facies. The basin is located to the east of the strike-slip fault in the western South China Sea and formed under the tectonic setting of the continental margin extension and the western margin of the South China Sea. Main development of the North East, North West, North-South and several other fault system, the different directions of the interception of each cut, wrong. The north-south fault system is a part of the western margin of the South China Sea. It has obvious signs of topography, geomorphology and gravity and magnetic anomalies. The seismic profile shows that it has the characteristics of strike-slip faults. The basin is divided into a Long two Au and a fault zone and other secondary structural units. The analysis of hydrocarbon geologic conditions shows the potential hydrocarbon potential of the basin.