第四纪沉积区断层及其上断点探测的地震方法技术——以银川隐伏活动断层为例

Seismic exploration method for buried fault and its up-breakpoint in Quaternary sediment area—An example of Yinchuan buried active fault

地震勘探方法是隐伏断层探测的一种有效的地球物理探测手段,而地震勘探的探测参数是影响探测效果和断层定位精度的主要因素.本文以银川市活断层探测的浅层地震勘探资料为例,并结合石油地震勘探剖面结果和钻孔地质资料,阐述了在第四纪覆盖层较厚的地区,由深至浅追踪目标断层形态和确定断层上断点空间位置的方法技术.结果表明,采用高分辨率地震勘探和钻孔地质剖面相结合的探测方法是确定隐伏断层位置、判定断层活动性的有效方法.

Seismic exploration is an effective geophysical method for buried fault survey. The spread geometries of seismic exploration are the main factors to affect the exploration results as well as the accuracy of fault location. In this paper, based on the shallow seismic exploration data obtained from active fault survey in Yinchuan city and also in combination with the oil seismic exploration profiles along with the drilling geological data, an upward fault tracing method was proposed to determine the geometry of the target fault and its up-breakpoint in thick Quaternary sediments. The result shows that the combination of high resolution shallow seismic exploration and drilling geological section is an effective way for locating the buried fault and determining its activity.