ANALYSIS OF STRUCTURAL STYLES OF ZHONGJIANNAN BASIN IN THE SOUTH CHINA SEA
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摘要: 中建南盆地是发育于南海西部陆缘我国传统疆界线附近的新生代沉积盆地,大部分区域位于我国传统疆界线内。在对盆地近万千米多道地震资料综合分析解释的基础上,对盆地的主要构造样式以及它们与油气的关系进行了分析,结果表明,盆地分布面积广,沉积厚度大,油气前景良好。盆地是属于早期断陷、后期经走滑改造而成的复合型盆地,其构造演化经历了3个阶段,不同的阶段发育不同的构造样式:早期为断陷阶段,伸展型构造样式发育;中期为断坳-压扭或走滑反转阶段,产生走滑或压扭性构造样式;晚期为区域沉降阶段,以垂向沉积为主,无明显的构造样式发育。Abstract: Zhongjiannan basin is a Cenozoic sedimentary basin developed in the west continental margin of the South China Sea and mostly inside the territory of China,and confined by the traditional boundary line of the country. With vast area and considerable sedimentary thickness, the basin has preferable perspective of hydrocarbon. As a composite basin, it underwent fault subsidence in the early time and then followed strike-slip reformation. The structural evolution of the basin has gone through three steps:①fault subsidence,with extensional structures developed;②strike-slip inversion,with strike-slip and extrusion structural styles formed accordingly;③regional subsidence,with vertical sedimentation mainly occurring and no obvious structural styles coming into being. Based on the interpretation of nearly 10 000 km seismic data of the basin, some main structural styles and their relation to hydrocarbon accumulation were comprehensively analyzed.
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