Studies on the effec of crack on the propagation of acoustic waves in wellbore
Li LIU1, Cheng-Guang ZHANG1(), Ming CAI1, Yang HE1, Yu-Jin HUA2, Yu LIU3
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education,Yangtze University,Wuhan 430100,China 2. College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China 3. School of Geophysics Measurement-control Technology,East China University of Technology,Nanchang 330013,China
In tight oil and gas reservoirs,cracks are important seepage channels and reservoir spaces for hydrocarbon migration.The development of the crack directly controls the reservoir performance.In order to evaluate the crack development by using the shear and Stoneley wave attenuation information,the authors used the three-dimensional variable grid time domain finite difference method to study the influence of crack widths and angles on shear and Stoneley wave attenuation in the wellbore environment.The results show that,as the crack width increases,the transmitted Shear wave and the Stoneley wave undergo energy decay.When the crack is tilted,the transmission Stoneley wave is insensitive to the crack dip.As the dip angle becomes larger,the attenuation does not change much.However,the transmitted shear wave is more sensitive to the crack dip.When the crack dip angle is 0°,the transmitted shear wave attenuation amplitude is the largest.As the dip angle of the crack becomes larger,the attenuation of the transmitted shear wave becomes significantly smaller.When the crack dip angle is greater than 25°,the attenuation amplitude of the transmitted shear wave becomes smaller and smaller as the angle increases.In addition,the numerical simulation of the shear wave attenuation curve is compared with the shear wave attenuation curve in the physical experiment, and the two are in good agreement.This study has a certain theoretical guidance for improving the acoustic logging evaluation method of fractured reservoirs.
刘黎, 章成广, 蔡明, 何洋, 滑玉琎, 刘玉. 裂缝对井眼声波的传播影响规律研究[J]. 物探与化探, 2019, 43(6): 1333-1340.
Li LIU, Cheng-Guang ZHANG, Ming CAI, Yang HE, Yu-Jin HUA, Yu LIU. Studies on the effec of crack on the propagation of acoustic waves in wellbore. Geophysical and Geochemical Exploration, 2019, 43(6): 1333-1340.
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