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南海南部海域油气资源丰富,由于盆地沉积厚度大、沉积相横向变化快和构造演化复杂等原因,致使该海域新生代地层的划分方案差异大,地层时代的认识也存在较大分歧,这极大地制约了对盆地油气资源评价的正确认识.本文在总结国内外不同分层方案基础上,通过收集国外在南海南部深水区两口关键钻井的资料,开展曾母和北康两盆地重处理二维地震剖面的构造-地层解译,以及联井剖面的井震对比,重新识别和标定新生代重要构造变革面的地震反射特征.根据海域钻井、地层岩性、沉积环境、构造应力体系和古生物资料的综合对比研究,结合婆罗洲陆地测年结果和区域构造事件,重新厘定中中新世T3构造变革面的发育时代,年龄为15～17Ma,分析了该界面的构造含义,认为其是南海海底扩张停止的一个构造响应界面,在南海南部海域对应南沙运动,在北婆罗洲地区表现为沙巴造山运动.
Due to the rich oil and gas resources in the southern South China Sea, the division scheme of the Cenozoic strata in this area is quite different due to the thick sedimentary thickness of the basin, the rapid change of sedimentary facies in the lateral direction and the complicated structural evolution. There is also great divergence in understanding of the stratigraphic age, Which restrict the correct understanding of basin oil and gas resources evaluation.On the basis of summarizing different stratification schemes at home and abroad, by collecting the data of two key drilling wells in the deepwater area of southern South China Sea, two-dimensional seismic processing of Zengmu and Beikang basins The structure-stratigraphic interpretation of the section, and the comparison of well-shaking of the cross-well section, so as to re-identify and calibrate the seismic reflection features of the Cenozoic important structural transformation surface.According to the characteristics of drilling, stratigraphy lithology, sedimentary environment, tectonic stress system and palaeontological data Based on the comprehensive comparison study and the land survey results and regional tectonic events in Borneo, we redefined the developmental age of the T3 structural transformation surface in the Miocene with an age of 15-17 Ma. The structural implications of this interface are analyzed and considered as the expansion of the South China Sea A structured response interface was stopped, corresponding to the Nansha movement in the southern South China Sea and in the northern Borneo Sabah orogeny.