声波测井中横波拾取研究

来源期刊：中南大学学报(自然科学版)1998年第6期

论文作者：谢尧生 张碧星

文章页码：5 - 8

关键词：声波测井; 可渗性孔隙介质; 横波拾取; 直接横波测井

Key words：acoustic logging; permeable medium; extraction of shear wave; direct shear wave logging

摘    要：研究了偏轴柱状声系激发的非对称声波场.在各向同性可渗性孔隙介质地层下，研究了时域全波列信号，指出对称和非对称声波场可通过简单的相加减办法来得到加强和削弱.理论和数值研究表明，将某些方位上接收的波形进行相加或相减等处理能较好地得到地层横波速度，为直接横波测井提供了可行方案

Abstract: The nonaxisymmetric acoustic field excited by a cylindrical tool placed off the axis of a fluid field borehole is investigated in this paper. In the case of isotropic homogeneous two phase medium,the full waveforms in the time domain is simulated and analyzed.It is pointed out that the components of the symmetric and nonaxisymmetric acoustic fields could be strengthened or weakened by adding and subtracting method.It is also indicated that the velocity of shear wave of the formation can be obtained by adding or subtracting the full waveforms logged in some opposite azimuths.It provides a possible method for the direct shear wave logging.