在对板桥凹陷钱圈三维工区沙三段、沙二段、沙一下段、沙一中段、沙一上段和东营组底界6 个层面断层系统的解释基础之上, 分析了钱圈地区断层平面分布特征, 并综合运用生长指数、活动 速率和古落差3 种指标定量研究断层活动性。结果表明: 钱圈地区主要发育2 组走向为NE 和NW 近似于垂直的正断层及3 级断裂, 其中沧东断裂为一级断裂, 大张坨断裂和G39 断层为二级断裂, 其余为三级断裂, 倾角大多为55°～70°。3 种活动性指标揭示了研究区内的主干断层大多为长期活 动的控制沉积断层, 断层发育经历了2 幕演化, 而且每一幕都经历了由弱到强再到弱的变化过程。

Based on the interpretation to Es₃, Es₂, lower Es₁, middle Es₁, upper Es₁ and the bottom of Ed in Qianquan area, Banqiao Sag, the plane distribution of the faults is analyzed. The growth index, activity rate and paleo fall of fault are applied to study the fault activity. The result shows that there developed two vertical normal faults towards NE and NW respectively in Qianquan area, among which Cangdong fault is first order fault, Dazhangtuo fault and G39 fault are second order fault, the others are third order fault, with most of the dip angles being from 55 degree to 70 degree. These three indexes indicate that most of the main faults in the study area experienced two evolution stages, and each was fromweak to strong and became weak again.