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为了获得对龙马溪组页岩储层声波传播特性的规律,选取川南地区下志留统龙马溪组页岩野外露头岩块,钻取不同层理角度的岩心(10个层理角度),采用透射法系统地分析了龙马溪组页岩不同层理角度的岩石纵横波速度,计算页岩岩石动弹性力学参数。研究结果表明川南地区龙马溪组页岩的纵横波速度呈显著的正线性关系,页岩岩石的纵横波速度比均值或纵波速度随层理角度的增加而减小;页岩岩石的动弹性模量、体积模量及剪切模量与岩石的纵横波速度有较好相关性,呈指数关系,而动泊松比与岩石纵波速度有良好线性相关性;声波速度随层理角度的增加或频率减小而减小,与频率呈良好的正对数关系;声波衰减系数随层理角度的增加或频率的增加而增大,与频率呈弱线性关系。
In order to obtain the regularity of acoustic propagation characteristics of the Longmaxi Formation shale reservoirs, the rock outcrops of the Lower Silurian Longmaxi Formation shale in southern Sichuan were selected to drill cores with different bedding angles (10 bedding angles) Transmission method systematically analyzed the longitudinal and shear wave velocities of different stratification angles of Longmaxi Formation shale, and calculated the dynamic elastic mechanics parameters of shale rocks. The results show that the longitudinal and shear wave velocities of the Longmaxi Formation shale in southern Sichuan show a significant positive linear relationship, and that of the shale rock decreases with the increase of the bedding angle. The dynamic elastic modulus of shale rock The volume, bulk modulus and shear modulus have a good correlation with the S-wave velocity of the rock and are exponential. The dynamic Poisson’s ratio has a good linear correlation with the P-wave velocity. The acoustic velocity increases with the increase of the bedding angle or The frequency decreases and decreases with a good positive logarithm; frequency attenuation coefficient increases with the increase of layering angle or frequency, and weakly linear relationship with the frequency.