A wealth of practical data show that it is difficult to attain the aim of enhancing the resolution by starting with the increase of frequency for the method of longitudinal (P) wave reflection.

• 大量实际资料表明,在松散地层中纵波速度受水饱和度的影响,故采用纵波反射法,从提高频率着手难以达到提高分辨率的目的。