西湖凹陷断裂体系发育特征及其控盆效应
蒋一鸣 , 郑津杭 , 唐贤君 , 何新建 , 吴智平 , 吴青波 , 程燕君
地球科学 ›› 2026, Vol. 51 ›› Issue (7) : 2663 -2681.
西湖凹陷断裂体系发育特征及其控盆效应
Developmental Characteristics of Fault System and Its Basin⁃Controlling Effects in Xihu Sag
西湖凹陷是中国东部近海中、新生代叠合含油气盆地东海陆架盆地的重要组成部分,其断裂体系发育时空差异特征不仅决定了盆地结构,也控制了油气成藏.运用最新的三维地震连片资料及钻井资料,对西湖凹陷断裂体系的发育特征及其控盆效应进行了系统分析,区划出新生代盆地基底先存、裂陷拉张及反转挤压3类不同成因类型的断裂体系,明确了NW(NWW)向先存基底断裂对新生代西湖凹陷斜坡带、中央反转带的南北分区效应;揭示了新生代裂陷早期(前平湖组沉积期)由NE-SW向断裂主控至裂陷晚期(平湖组沉积期)由近SN向断裂主控的转变;阐明了纵张、横张及逆断(反转)等龙井、冲绳运动挤压反转形成的断裂体系与反转背斜的成因联系.研究成果对于认识西湖凹陷乃至整个东海陆架盆地构造差异演化过程与机理具有理论意义,也可为该地区油气勘探实践提供指导.
The Xihu Sag is an important Meso-Cenozoic superimposed petroliferous basin in the East China Sea Shelf Basin offshore eastern China. The spatiotemporal variation characteristics of its fault system development not only determine the basin structure but also control hydrocarbon accumulation. This paper uses the latest integrated 3D seismic data and drilling data to systematically analyze the developmental characteristics and basin-controlling effects of the fault system in the Xihu Sag, classifying three genetically distinct fault types: pre-existing Cenozoic basement faults, rift-related extensional faults, and inversion-related compressional faults. It clarifies the north-south partitioning effect of NW (NWW)-trending pre-existing basement faults on the Cenozoic slope belt and central inversion zone of the Xihu Sag; reveals the transition from NE-SW-trending faults dominating the early rifting stage (pre-Pinghu Formation deposition) to near SN-trending faults dominating the late rifting stage (Pinghu Formation deposition); and elucidates the genetic relationships between compressional inversion fault systems (longitudinal tension, transverse tension, and reverse faults) formed during the Longjing and Okinawa tectonic movements and inversion anticlines. The research results hold theoretical significance for understanding the tectonic differential evolution process and mechanisms of the Xihu Sag and even the entire East China Sea Shelf Basin, and can provide guidance for hydrocarbon exploration practices in this region.
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新型油气勘探开发国家科技重大专项(2025ZD1402802)
中海油(中国)有限公司重大三外项目(CCL2023SHPS002EM)
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