【摘要】 采用超长源距多接收点声源模型,通过井孔声全波数值模拟计算,考察了利用反射波作为探测柱状多层介质径向界面的可行性和方法.计算了流体 固体 固体柱状三层井孔体系最远至30m的阵列全波曲线,远井界面反射波有明显显示,与用理论推导的反射波到时 源距公式计算的时距曲线符合很好.绘制了校正后(消除管波影响)的界面时间(深度)记录剖面图,给出远井界面(同相轴)信息.更多还原

【Abstract】 By means of the acoustic source model of multiple receiving points from excessively long source distance and the numerical simulation computation of the acoustic full-wave in the borehole, the feasibility and method of using reflected wave to detect the transverse interface of the cylindrical multi-layered media were (investigated). An array of full-wave curves of the cylindrical triple-layered fluid-solid-solid borehole system that is 30 m away was calculated, and the reflected wave from the interface far from the borehole was clearly shown, which agrees fairly well with the time-distance curve calculated by virtue of the theoretically derived (equations) of source distance-arrival time of reflected wave. Finally, a cross-section chart of the interface (time(depth)) records after adjustment (without the influence of tube wave) was drawn, and the information of interface far away from the borehole (of in-phase axis) was clearly presented.更多还原