裂缝对井眼声波的传播影响规律研究  

Studies on the effec of crack on the propagation of acoustic waves in wellbore

作　　者：刘黎[1] 章成广[1] 蔡明 何洋 滑玉琎 刘玉 LIU Li;ZHANG Cheng-Guang;CAI Ming;HE Yang;HUA Yu-Jin;LIU Yu(Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Geophysics Measurement?control Technology,East China University of Technology,Nanchang 330013,China)

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北武汉430100 [2]太原理工大学矿业工程学院,山西太原030024 [3]东华理工大学地球物理与测控学院,江西南昌330013

出　　处：《物探与化探》2019年第6期1333-1340,共8页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(41774116)

摘　　要：在致密油气储层中,裂缝是油气运移的重要渗流通道和储集空间,裂缝的发育情况直接控制着储集层的储集性能。为了利用横波和斯通利波衰减信息评价裂缝发育情况,采用三维变网格时域有限差分数值模拟研究了井眼环境下裂缝宽度、裂缝倾角对横波和斯通利波衰减的影响规律。研究结果表明:随着裂缝宽度增大,透射横波、透射斯通利波发生能量衰减;当裂缝倾斜时,透射斯通利波对裂缝倾角不敏感,随着倾角变大衰减变化不大。而透射横波对裂缝倾角较为敏感,当裂缝倾角为0°时,透射横波衰减幅度最大;随着裂缝倾角变大,透射横波衰减幅度明显变小;裂缝倾角大于25°时,随着角度进一步的增加,透射横波衰减幅度缓慢变小。此外,将数值模拟的横波衰减曲线与物理实验中的横波衰减曲线进行对比,两者吻合性良好。本研究对于完善裂缝性储层的声波测井评价方法具有一定的理论指导作用。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 at?tenuation 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.

关 键 词：微裂缝 斯通利波 横波 裂缝倾角 数值模拟 

分 类 号：P631.4[天文地球—地质矿产勘探]