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在有些地区,反射地震不能揭示出较深的地质目标。或者是由于声阻抗差小,或者是由于上伏层多次波的缘故,所以可能探测不到基底深度多数情况下折射地震可在这方面弥补反射测量的不足。在使用可控震源时,有可能用同一检波器排列同时收集反射和折射资料而不影响的反射工作。因为反射和折射的最佳频率范围不同,需要使用不同的标准扫描信号。可以在处理中心分别对两种扫描信号各相关一次提取出数据。在使用适当设备的情况下,也可在野外相关提取数据:即在野外实时地把每一道反射和折射的标准扫描信号相关。实例研究证明,单独用一个可控震源组一同工作,即可得到有用的折射资料。而且,用编码技术可使反射可控震源组合与两台折射可控震源(排列两侧各一台)同时工作,从而获得相遇折射覆盖观测系统。
Reflective earthquakes can not reveal deep geological targets in some areas. Reflective earthquakes may not be able to detect the depth of the basement either because of the small acoustic impedance difference or because of the multiples of the updip layer. Reflective earthquakes make up for the lack of reflection measurements in this respect. When using vibroseis, it is possible to use the same detector arrangement to collect both the reflected and the refracted data without affecting the reflex work. Because of the optimal frequency range for reflection and refraction, different standard scan signals are required. In the processing center, respectively, the two scan signals related to each extracted data. With suitable equipment, field-related extraction of data is also possible: correlating each of the standard scan signals reflected and refracted in real time in the field. Case studies have shown that using a single vibrator unit alone can work together to obtain useful refraction data. Furthermore, the combination of reflective vibroseis and two refracted vibrators (one on each side of the array) can be used at the same time with the coding technique to obtain the encounter refraction coverage observation system.