【摘要】 用有限元法研究了当井中存在水平裂缝时的声波全波列 ,并对裂缝宽度对低频斯通利波的影响进行了数值分析。当井中存在水平裂缝时 ,在接收的声波全波列波形中 ,既有直达的斯通利波 ,也存在来自裂缝的反射斯通利波。数值计算结果与实验测量结果具有很好的一致性。计算结果表明 ,裂缝宽度越大 ,反射斯通利波的幅度也越大 ,而直达波幅度变小更多还原

【Abstract】 The full acoustic waveforms in borehole with horizontal fractures were investigated by using finite element method (FEM). The influences of width of fracture on low frequency Stoneley wave are analyzed numerically. When the horizontal fracture happens, both direct and reflected Stoneley waves are received. The theoretical results agree with the experimental results. The amplitude of the reflected stoneley wave gets larger and that of direct stoneley wave gets smaller with increase of width of fracture.更多还原