Abstract
We have developed simulators of the finite difference method (FDM) and finite element method (FEM) to study the acoustic reflection wave fields generated by acoustic logging tool in both wire line and LWD cases, respectively. We found that both the FDM and FEM can simulate the responses of the acoustic reflection image logging in typical models effectively. The simulation results demonstrate it is critical to choose a suitable tool spacing to make the amplitude of reflections as large as possible for separation of the reflections from the full waveform and to utilize converted reflections for fracture evaluation. We also found that the borehole-logging tool configuration of LWD may be favoring those reflection waves with lower frequencies and less oscillation (cleaner and shorter wave train)
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