ANALYSIS OF LOCAL TECTONIC CHARACTERS OF ZHONGJIANNAN BASIN IN SOUTH CHINA SEA
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摘要: 中建南盆地是位于南海西部陆缘的大型新生代沉积盆地。调查资料表明,盆地面积超过11×104km2,沉积厚度达8500m,局部构造发育,油气前景良好。在对盆地大量多道地震资料综合分析解释的基础上,研究了盆地局部构造的圈闭类型、分布特征和发育史。盆地的局部构造主要分为构造圈闭、地层圈闭和复合型圈闭。早期发育伸展构造样式,伴生以张性为主的局部构造圈闭;晚期受走滑应力的改造,发育花状张扭或压扭性构造;特定的构造和沉积环境则造就了地层和复合型圈闭构造。Abstract: Zhongjiannan basin is a large Cenozoic sedimentary basin developed in the west continental margin of South China Sea. Exploration data show that the basin has good hydrocarbon potential with vast area, considerable sedimentary thickness and various local traps. An analysis of type, distribution and evolu-tion of local traps in the basin was done based on the integrated analysis and interpretation of a great deal of multi-channel seismic data collected in the basin. Local traps in the basin mainly include structural traps, stratum traps and composite traps. As a strike slip-extensional composite basin, it developed extensional structural styles in the early time, associated with extensional local traps; later, it was reworked by strike-slip stress reformation, and the tenso-shear and compresso-shear structures were formed such as flower structure; special structural and sedimentary environment resulted in the formation of stratum traps and composite traps.
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Key words:
- local trap /
- structural trap /
- stratum trap /
- composite trap /
- Zhongjiannan basin
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