Processing And Application Of Multipole Array Acoustic Logging Data In X Well Area

After oil and gas fields develop to a certain stage,artificial fracturing is needed to improve the oil flow environment in order to improve the production efficiency,so it is very important to study the fracturing characteristics of reservoirs.Ground stress analysis is the basis for evaluating the fracturing ability of reservoirs,rock mechanics parameters are important parameters for ground stress analysis,and the calculation of elastic mechanics parameters is based on the known longitudinal and shear wave velocities,so the problem focuses on how to accurately extract acoustic time difference.Multipole array acoustic logging technology can obtain abundant acoustic full wave train information,which plays a key role in evaluating fracturing characteristics of reservoir.In this paper,an improved Prony time difference extraction method is proposed,in which the combined waveform theory is used to predict the array receiver's acoustic waveform,and then the square of the two norms of the difference between the predicted waveform and the measured waveform is used as the objective function.By finding the minimum value of the objective function,the time difference of each component is obtained.In this paper,and put forward the improvement method to extract the singular value decomposition of the jet lag,the method first build array from the array receiver waveform waveform data matrix,and then singular value decomposition of matrix,get the singular value,using the subspace class weighted function to calculate SNR,by finding a maximum signal-to-noise ratio for each wave of time difference.Will be two kinds of acoustic moveout extraction method can improve the hook CIFLog logging platform,processing and interpretation of cross multipole array acoustic logging(XMAC-?)data processing and interpretation,to extract the real reliable acoustic velocity,then the rock elastic mechanics parameters.Based on the experimental data,the relationship between dynamic elastic mechanical parameters of rock and static elastic mechanical parameters of rock was established,and the static elastic mechanical parameters of rock required by well logging evaluation were obtained.On this basis,the rock brittleness index was calculated and the reservoir in-situ stress was evaluated according to huang's model.Taking X wellblock ijmeer oilfield as the research object,using the above methods to form a set of array acoustic log comprehensive interpretation of engineering application technology process,discusses the time difference between the improved extraction technology in reservoir stress estimation,the reservoir evaluation of brittle rock mechanics inengineering application,the effect significantly,has great engineering application value.