... technique has not been established yet. In our laboratory studies, it turns out that the transmission time of the torsional wave passing through a core sample with fracture is longer than that of the one without any fracture, although the core samples have the same physical properties and the equal length...

... ABSTRACT Transient wave forms are present for a proposed logging tool which is capable of exploiting flexural and torsional waves, as well as more familiar axisymmetric wave types. Torsional waves appear especially promising for investigation invaded zones and other inhomogeneities. The design...