井旁裂缝随钻声波测井响应的数值模拟研究  

Numerical Simulation Research of Sonic Logging Response While Drilling from Borehole Side Fracture

作　　者：吴莎 尚海燕[1] 赵凯雄 Wu Sha;Shang Haiyan;Zhao Kaixiong(School of Electronic Engineering,Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安石油大学电子工程学院,西安710065

出　　处：《黑龙江科学》2024年第6期44-47,共4页Heilongjiang Science

摘　　要：裂缝是油气运移的重要渗流通道和储集空间,为研究井旁水平裂缝对声波响应的影响,采用薄平板流体层裂缝模型,利用有限元数值模拟含有水平裂缝地层的声波全波列响应。在10~25 kHz频段内进行裂缝性地层反射声场的数值模拟,优选出冲激声源的最佳激发频段,研究不同源距下全波列中斯通利波的衰减系数及不同裂缝宽度对斯通利波的影响。结果表明,在最优激发频率20 kHz下,当源距为4 m时反射波相对幅值较大,源距为4.5 m时直达斯通利波的衰减最大;裂缝宽度越大,斯通利波的衰减越大、反射斯通利波及反射横波的幅度越大;接收器距离裂缝越近,反射斯通利波与反射横波的幅度越大。Fractures are important seepage channels and reservoir space for oil and gas migration.In order to study the effect of borehole side on acoustic response,a thin plate fluid layer fracture model is used to finite element numerical simulation of the full wave train response of horizontally fractured formation.The numerical simulation of the reflection sound field in the fractured formation is carried out in the frequency band of 10~25 kHz,and the optimum excitation frequency band of impulse sound source are selected.Then the attenuation coefficient of Stoneley wave in the full wave train under different source distances is studied,the effect of different fractures widths on Stoneley waves is also studied.The results indicate that,under the optimal excitation frequency of 20 kHz,the relative amplitude of the reflected wave is larger when the source distance is 4 m.The attenuation of direct Stoneley wave is maximum when the source distance is 4.5 m.The larger the fractures width is,the larger the attenuation of Stoneley wave is,and the larger the amplitude of reflecting Stoneley waves and reflecting shear waves is.The closer the receiver to the fractures is,the greater the amplitude of reflecting Stoneley waves and reflecting shear waves is.

关 键 词：冲激声源深探测 数值模拟 水平裂缝 反射斯通利波 斯通利波衰减系数 

分 类 号：P631.83[天文地球—地质矿产勘探]