Influencing Factors of Shear Wave Radiation of a Dipole Source in a Fluid-Filled Borehole

In shear wave far detection logging, dipole-source radiation is the main factor influencing amplitude of reflected waves. this paper, a method derived with far-field asymptotic solution to calculate waves in fluid-filled borehole. Then simulated under both low and high frequencies. addition, influences formation elastic parameters on are analyzed variations characteristics source frequency borehole radius compared. Results show that density compressional velocity have little effect However, not only affects radiated by dipole (radiation performance), but also energy distribution at different locations space direction). The has better performance coverage optimal excitation formations very close, which good for application technology circumstances. At frequency, influence radiation, no matter how large is. modulation cannot be ignored, especially radius.