最近,人们已经认识到如果能记录声波全波信号,就能从中提取大量的信息,仅声波纵波时差曲线不再满足人们的需要。为了更好地评价储层,需要其它信息如横波波速以及不同类型声波的幅度。现在已研制了一种能满足这一要求的仪器,其商标为EVA。 Recently, people have realized that if the full-wave signal can be recorded, a large amount of information can be extracted therefrom. Only the time-delay curve of the sound wave longitudinal wave can no longer satisfy the needs of the people. In order to evaluate the reservoir better, additional information is needed such as the shear wave velocity and the amplitude of the different types of sound waves. An instrument that meets this requirement has now been developed under the trademark of EVA.