苏北盆地高邮凹陷汉留断裂带应力场数值模拟及断层成因分析

在地质、地震、测井等资料的基础上，运用平衡剖面技术、断层落差法和构造应力场数值模拟技术分析苏北盆地高邮凹陷汉留断裂带断层成因机制。结果表明:高邮凹陷汉留断裂带主要发育NEE、近EW、NW向断层，断层组合样式在平面上为平行式、斜交式和羽状，在剖面上为阶梯状、“Y”字形和复“Y”字形；阜宁期SSE倾向断层发育，三垛期次级断层发育；阜宁期汉留断裂带中、南部平面剪应力为负值，控制发育NEE向断层，北部为正值，控制发育近EW向断层，剖面上研究区剪应力为负值，控制断层倾向SE；三垛期汉留断裂带北部和南部部分地区平面剪应力为负值，控制发育NEE向断层，中部为正值，控制发育近EW、NW向断层，剖面剪应力在北部为正值，控制断层倾向SE，其南部为负值，控制断层倾向NW。

Numerical Simulation of Stress Field and Fault Genesis Analysis of Hanliu Fault Zone in Gaoyou Sag of Subei Basin,China

On the basis of geological, seismic and logging data, the fault genetic mechanism of Hanliu fault zone in Gaoyou sag of Subei Basin was analyzed by applying the equilibrium profile technique, fault throw method and numerical simulation of structural stress field. The results show that the faults of Hanliu fault zone in Gaoyou sag mainly strike NEE, EW and NW, the plane fault combination styles are parallel-aligned, skew-type and pinnate-type, and the profile fault combination styles are ladder-like style, Y-type and multiple Y-type; the faults with SSE-trending develop during Funing period, and the secondary faults mainly develop during Sanduo period; the plane shear stress is negative during Funing period in the middle and southern Hanliu fault zone, controlling the formation of faults with NEE-striking, while the value is positive in the northern area, controlling the formation of faults with nearly EW-striking, and the profile shear stress is negative in Hanliu fault zone, controlling the formation of faults with SE-trending; the plane shear stress is negative during Sanduo period in the northern and partial southern Hanliu fault zone, controlling the formation of faults with NEE-striking, while the value is positive in the middle area, controlling the formation of faults with nearly EW- and NW-striking, and the profile shear stress is positive in the northern Hanliu fault zone, controlling the formation of faults with SE-trending, while the value is negative in the southern area, controlling the formation of faults with NW-trending.