Fault characteristic analysis and numerical modeling for accommodation zones in the southern fault step zone of the Gaoyou Sag
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摘要: 在高邮凹陷南断阶北界上,始新世出现的总体北北东走向、左阶雁列状真②断层带内发育了许庄与方巷调节带。各反射层构造图显示,这两个调节带内部发育了连接与非连接两大类断层。其中连接断层可分为垂向连接、斜向连接与弧形连接3类,而非连接断层可分为同向平行断层、区域斜向正断层、斜向与横向断坡拉张断层、斜向与垂向连接—扩展断层、派生斜列断层、网状断层8类。本文通过有限差分法与有限单元法数值模拟,再现了调节带内各类断层的发育过程。结果表明,调节带内的断层一方面是区域应力直接作用的产物,另一方面是边界断层斜向拉张与扩展、断坡弯曲等影响的结果。故而,调节带内断层的发育受多种因素影响,常形成复杂的断层组合。Abstract: The Xuzhuang and Fangxiang accommodation zones occur between three NNE-striking,left-step,en echelon Zhen-② faults,developed in Eocene,along the northern border of the southern fault step zone of the Gaoyou Sag.Structural maps for different reflection surfaces shows that normal faults in the two accommodation zones can be classified into two major types,i.e.connection fault and non-connection fault.The connection fault can be divided into three types including perpendicular connection fault,oblique connection fault and arc connection fault.The non-connection fault can be divided into eight types,including synthetic parallel fault,regional oblique fault,oblique and transverse ramp extension fault,oblique and perpendicular connection-propagation fault,secondary en echelon fault and reticular fault.Our numerical modeling in both the finite difference and finite element methods shows development processes for the different faults in an accommodation zone.The results suggest that faults in the accommodation zones form as direct results of a regional stress,or as results of oblique extension and propagation of the boundary faults as well as bending fault ramp.Therefore,fault development in an accommodation zone is influenced by several factors,leading to complicated fault sets.
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Key words:
- Accommodation zone /
- Southern fault step zone /
- Zhen-② fault /
- Numerical modeling
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