第四纪盆地隐伏断层活动性的D-T法研究及应用

Research and Application of D--T Method on Determinating Activity of Buried Faults in Quaternary Basins

摘要:

本文在跨断层钻孔勘探的基础上,针对钻孔联合剖面提出了钻孔沉积深度-时间(D-T)分析方法。该方法以深度为纵轴、沉积时代为横轴做每一钻孔的D-T曲线,分析同一钻探场地断层两侧D-T曲线反映的沉积速率的差别,判断断层的活动时代和错距。该方法在福州盆地和泉州盆地的城市活断层探测项目应用得到较好的结果。最后分析了该方法的影响因素,指出钻探场地的地形(古地形)的稳定平坦是D-T法的关键。

Abstract:

Based on drilling exploration cross faults, this paper presents Depth-Time （D-T） analysis method for compositing drilling section exploration. The method designs D-T graph （ depth as Y axis, time of sediment as X axis） , analyzes the defference of sedimentation speed inboth sides of fault, determines the activity time and displacement of fault. The method is applied in works of urban fault exploration in Fuzhou basin and Quanzhou basin, and brings good results. At last, the influence factors to the method are analyzed, and it is considered the key factor is flatness of terrain （ ancient terrain） of the drilling site.