Reflection Wave Separation Technology And Its Application In Acoustic Logging

Reflected acoustic imaging logging technology has a higher resolution and is more than ten meters or even tens of meters deep.With the successful development of azimuth far-detecting reflected acoustic imaging logging tools,data processing and imaging display analysis related to azimuth far-detecting reflected acoustic imaging logging are also becoming increasingly important.Based on the research on the development of reflected wave extraction at home and abroad,this paper studies the reflection wave extraction and separation technology of array acoustic logging tools.First,the characteristics of the reflected wave field in the reflected acoustic wave log are analyzed from the perspective of data processing.Then,the conventional methods such as median filtering,singular value decomposition,parameter estimation,time difference median filtering,F-K filtering,and Radon transform are used to eliminate the advantages and disadvantages of wellbore mode waves and applicable conditions.Finally,F-K filtering and least square Radon transform and high resolution Radon transform are used to perform uplink and downlink separation.The correctness and effectiveness of these methods are verified by numerical simulation data and field measured data.The application results of wellbore mode wave elimination and the up and down waves separation are compared and analyzed.The results show that when the wellbore mode wave is strong,the median value is obtained.The quality of the reflected wave extracted by the filtering method and the singular value decomposition method is higher than that of the F-K filter and the Radon transform.When the wellbore mode wave energy is not too strong and the apparent velocity is different from the reflected wave,the F-K filter and the Radon transform are extracted.The reflected wave quality is higher than the median filtering method and the singular value decomposition method.The high resolution Radon transform is superior to the least square Radon transform in separating the upper and lower waves.According to different processing data,selecting the appropriate wave field separation method can improve the quality of reflected wave separation.