小型冲击叠加震源及应用效果

高分辨率地震勘探中，如何激发高频信号是至关重要的问题。当遇到地表松散的地层，且地下水位较低时，无论是锤击震源还是炸药震源，都显得一筹莫展。石油地震勘探使用的可控震源可以激发高频信号，并具有较强的抗干扰能力，已在国内外广泛使用。依据可控震源的基本原理，使用小功率电锤进行冲击叠加，在表层松软和有环境干扰的地区，获得了主频80～150 Hz的有效波信号，探测深度达到300 m，可以满足浅层高分辨地震勘探的需求。通过应用实例证明了方法的有效性和优越性。

Small stacking hammer source and its application effects

High-resolution seismic prospecting is one of the common geophysical prospecting methods in engineering investigation, and it is very important to excite high-frequency signals. Both hammer source and explosive energy source fail to excite desired signals in areas of loose ground and relatively low underground water level. Vibroseis that is capable of exciting high frequency signals and is of strong noise immunity has been widely used in petroleum industry both at home and abroad. Based on principles of vibroseis, we acquire effective signals with dominant frequency of 80-150 Hz by using low power electric stacking hammer source in areas of loose ground and strong environmental interference, and the penetrating depth is about 300 m deep. The method was demonstrated with real examples.