常常采集井中声波来求取界面纵波和横波速度。为此,常用备有各种类型声波源,即单极和双极源的现代井中声波工具。我们已专门研究了用双极源来测量横波速度,在确定由大约35％孔隙度和横波速度大约为465m/s的未固结砂岩组成的较低纵波速度层时,我们发现双极源优于单极源。在此层,已记录的纵 Sound waves are often collected in wells to determine the interface longitudinal and shear wave velocities. For this reason, modern well-to-well acoustic tools with various types of sonic sources, monopoles and bipolar sources, are commonly used. We have specifically studied the use of bipolar sources to measure shear wave velocities. In determining the lower P wave velocities composed of unconsolidated sandstone with a porosity of about 35% and a shear wave velocity of about 465 m / s, we have found that bipolar source On the monopole source. At this level, the recorded vertical