Developmental Characteristics of Fault System and Its Basin-Controlling Effects in Xihu Sag
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摘要: 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.Abstract: 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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Key words:
- fault controlled system /
- basin-controlling effect /
- Xihu Sag /
- petroleum geology
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图 1 西湖凹陷构造位置与构造单元组成
据周心怀等(2019)修改. a.西湖凹陷在东海盆地内的构造位置; b.西湖凹陷构造单元组成
Fig. 1. Structural location and structural unit composition of Xihu Sag
图 4 西湖凹陷SSW-NNE向测线所揭示的断裂体系发育特征(测线位置见图 3)
a.斜坡带AA'; b.凹陷中央带BB’; c.中央反转带CC’
Fig. 4. The development characteristics of the fault system revealed by the SSW-NNE trending line in the Xihu Sag
图 5 西湖凹陷NW-SE向测线所揭示的断裂体系发育特征(测线位置见图 3)
a.杭州斜坡‒嘉兴反转带DD’;b.平湖斜坡‒宁波反转带EE’;c.天台斜坡‒天台反转带FF’
Fig. 5. The development characteristics of fault system revealed by NW-SE trending survey line in the Xihu Sag
图 8 西湖凹陷三维工区主要断裂裂陷期的活动强度分析
a.新生代前平湖组沉积期(T100-T40)主要断层的落差;b.新生代平湖组沉积期(T40-T30)主要断层的落差. 选择过各断裂中部且与之近于垂直的NWW-SEE向测线进行断层落差统计,图中横坐标为自北向南的各NWW-SEE向的测线号,纵坐标为各测线所切断层的落差;各断层的发育平面位置见图 3
Fig. 8. The activity intensity analysis diagram of the main fault rifting period in the three-dimensional work area of the Xihu Sag
图 15 先存断裂对后期构造变形的调节转换所导致的分区效应
a.拉张转换(据Uzel et al.,2013修改);b.挤压转换(据Fossen and Rotevatn, 2016)
Fig. 15. The zoning effect caused by the adjustment and transformation of the pre-existing fault to the later structural deformation
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