中文摘要：

当时，一个 cased 洞里的声学的地通过由联合实验测量的数字建模被学习第一并且 scond 接口被结合很好。casing 到达(ACA ) 的振幅上的钢管子的水泥，直径和厚度的密度的效果被调查，并且数字结果的部分与试验性的结果相比。这些结果证明 ACA 与水泥的增加的密度减少。在那里存在为低密度、正常密度的水泥的 ACA 之间的大差别。因此，不同标准应该与不同密度为水泥在结合的评估被拿。当当它的直径作为一个常数保留时，钢管子的厚度增加， casing 波浪的到达时间仍然保持不变，当 ACA 增加时。但是当有经常的厚度的管子的直径增加时，波浪被推迟的 casing 的到达时间，和 ACA 减少。至于通常在油矿使用的三种钢管子， casing 到达的相对振幅在大管子中是更大的。另外，总体上，有水泥的密度的 casing 到达的相对振幅的变化趋势的数字结果与试验性的一致。

英文摘要：

The acoustic field in a cased hole is studied through numerical modeling by combining experiment measurement when the first and scond interfaces are bonded well. The effects of the density of the cement, the diameter and thickness of the steel pipe on the amplitude of casing arrival （ACA） are investigated, and a part of the numerical results are compared with the experimental results. These results show that the ACA decreases with the increasing density of the cement. There exists a large difference between the ACAs for the low- and normal-density cements. Therefore, the different standard should be taken in the bonding evaluation for ce- ments with different densities. As the thickness of the steel pipe increases while its diameter keeps as a constant, the arrival time of the casing wave remains unvaried, while the ACA in- creases. But, when the diameter of the pipe with a constant thickness increases, the arrival time of the easing wave is delayed, and the ACA decreases. As for three kinds of the steel pipe commonly used in oilfields, the relative amplitude of the casing arrival is larger in the big pipe. In addition, the numerical results of the varying trend of the relative amplitude of the casing arrival with the density of cements, on the whole, are in agreement with the experimental ones.