【摘要】 为预测横波波速,在理论分析基础上,以目标区砂岩岩样为研究对象,通过核磁共振和横波速度测量实验,建立核磁共振T₂几何平均值与横波波速之间关系。核磁共振T₂几何平均值以及岩石横波波速的岩石物理基础具有相通之处,即二者均包含孔隙度的贡献,而且考虑了孔隙尺度、比表面等孔隙结构的影响。核磁共振T₂几何平均值与横波波速之间存在幂函数关系,T₂几何平均值增大,横波波速降低。实例表明,利用核磁共振T₂几何平均值进行横波波速预测,模型简单实用,效果较好。更多还原

【Abstract】 In order to predict the shear wave velocity better,based on theoretical research and taking middle-deep sandstone samples as the research object,we build relationship between NMR T₂ geometric average and shear-wave velocity by NMR experiments and shear wave velocity.The research shows that the T₂ geometric average and shear wave velocity of rock have the same rock physical basis.It not only includes the contribution of porosity but also considers the influence of pore structure such as the size of pore,specific surface of pore,etc.There is a power function relationship between NMR T₂ geometric average and shear wave velocity.Shear wave velocity decreases with increasement of T₂ geometric average.Examples show that using the T₂ geometric average to predict shear wave velocity is simple and practical and the effect is better.更多还原