Multipole Array Acoustic Logging Evaluation Application In Puwei Area Of Dongpu Depression

With the exploration and development of the area of dongpu sag,as its key expected PuWei area,reservoir structure morphology and properties of more complex.The traditional geophysical well logging technology has not meet the requirements of the current oil and gas exploration,in this case,the need to apply the advanced logging technology comprehensive evaluation of oil and gas layer.Multipole array sonic logging is one of the more advanced logging technology,the technology is different from the conventional acoustic logging technology,not only can measure the longitudinal wave,also can be measured more stratigraphic information,such as shear wave velocity,stoneley wave,etc.This article obtains from the multipole array acoustic principle,studies the related theory,multipole array acoustic slowness-time correlation method,Afford anisotropic calculating method,based on Biot stoneley wave permeability inversion theory,etc.Through the analysis of multipole array acoustic measure of compressional wave,shear wave and stoneley wave and the time difference data such as fast and slow shear wave for the lithology identification,evaluation,formation anisotropy,reservoir permeability and evaluate fluid property and so on.Specifically: by histogram and crossplot method for complex lithology identification,summed up the regional different lithology logging response characteristics of p-wave;By studying Alford rotation analysis method to evaluate formation anisotropy,determine wellblock nowadays the maximum horizontal principal stress direction,identification and evaluation of cracks effectiveness;Based on Biot theory,using low frequency stoneley wave permeability reservoir evaluation;Using the information of p-wave and modulus curve qualitative or quantitative evaluation of reservoir fluid property,establish the corresponding log interpretation standards.Using the method of Pu Wei area of dongpu sag for the integrated 20 well logging evaluation,solve the complex lithology is difficult to identify the region,in principal stress direction and formation permeability,set up corresponding interpretation standard,has obtained the good effect.The research method has been applied to PuWei area of dongpu sag,and good results were obtained,the results will be generalized to other parts of the dongpu sag,dongpu area for the future oil and gas resources survey and provide a scientific basis for exploration and development.