水平渗透性裂缝对井孔斯通利波传播的影响

当地层中存在与井孔相交的裂缝时，斯通利波会发生显著衰减，并产生反射波，透射波与反射波的幅度大小与裂缝宽度，充填物及其渗透性密切相关，本文在简化的孔隙地层井孔声波传播理论基础报水平渗透性裂缝带对斯通利波传播的影响，在按比例缩小的模型并中进行了全波列模拟实验验证了理论分析结果。通过比较裂缝灰岩与孔隙砂岩模型并中的结果，还发现斯通利波的频率特性与地层的渗透率有密切关系。

Effects of Horizontal Permeable Fractures on the Borehole Stoneley Waves

If there is a fracture arcoss borehole in a formation,the Stoneley waves energywill be attenuated, and part of energy will be reflected. The amplitudes of thetransmitted wave and reflected wave are closely related to the fracture width, medium properties and permeability of fracture zone. On the basis of a simplified modelfor elastic wave propagation in a porous media, an investigation is presented for theeffect of a horizontal permeable fracture zone on the Stoneley waves.The theoretical results are tested by the experiments on full acoustic waveform in a scaled modelborehole. With comparison results from fractured limestone model and a poroussandstone model borehole, it is found that frequency characteristics of the Stoneleywaves are related to the permeability of formation.