Azimuth Inversion Method For P-Wave Reflection Logging

One of the main characteristics of current reservoirs is that they vary greatly in lateral direction and exhibit a strong heterogeneity,which makes it difficult for high-precision exploration.However,the depth of acoustic remote-sensing logging is deeper than that of conventional logging,and the resolution is high.The monopole acoustic reflection imaging technology uses longitudinal waves to perform azimuth imaging.One of the main problems in imaging is the body position determination.In this paper,we use the source location technology in microseismic to determine the body position.Based on Schlumberger's Sonic Scanner instrument characteristics,the linear positioning method,Geiger positioning method and Newton iterative positioning method for microseismic source localization are improved,and the four unknowns of space 3D and time dimension in microseismic are reduced to three unknowns that improve the calculation accuracy.The value calculated by the linear positioning method is calculated as the initial value of the Geiger positioning method and the Newton iterative positioning method,which can improve the accuracy and the convergence rate.The reflection interfaces at different distances and tilt angles from the instrument were simulated.When the reflected wave arrival time was calculated,three positioning methods were used to process the reflected wave arrival data.The applicable conditions and effects of the three methods were compared.Finally,the finite-difference numerical simulation method was used to simulate the well response of azimuth receiver acoustic logging with a reflector at the side of the well.When the reflected wave was extracted,three methods were used to determine body position The results confirme that the use of a virtual source location method for the inversion of the reflectivity of the monopole reflection imaging logging reflector is effective.