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无论在理论上或实际上都说明多孔岩石的横波速度对流体饱和度的敏感性较纵波为低。因此,观测通过水饱和或气饱和区的地震波的速度之比,可以产生一个能够看出来的异常,它是与纵波速度的区域变化无关的。反射法地震勘探宁横波资料的一个来源是,在水底纵波速度高的海区,纵波到横波的波型转换。比较简单的、以振幅变化为入射角的函数的解释技术,是横波与多次反射纵波之间的一个可能的判别手段,也给出了实际情况下的这种资料。细致地把正常时差速度分析和这种振幅偏差的判别手段配合起来,可以构成横波反射剖面,从而将共与一般的纵波剖面进行对比。一旦获得了这种剖面,就能够作出地震波速度比的变化图,同时揭露出地下的潜在异常区。
Whether in theory or in fact, the shear wave velocity of porous rock is less sensitive to fluid saturation than that of longitudinal wave. Therefore, observing the ratio of seismic wave velocities through water-saturated or gas-saturated regions produces an observable anomaly that is independent of the region of longitudinal wave velocity. Reflecting seismic exploration One of the sources of Ning-sheng-wave data is the mode conversion from P-wave to S-wave in the sea area where the P-wave velocity is high. The simpler technique of interpreting the change in amplitude as a function of angle of incidence is a possible discriminant between transverse and multiple reflected longitudinal waves and also gives this information in practice. Meticulously analyzing the normal time-lag velocity and the method of discriminating the amplitude deviation, it is possible to construct a transverse wave reflection profile that will be compared with a general longitudinal wave profile. Once this profile is obtained, a map of changes in the seismic velocity ratio can be made, revealing potential underground anomalies.