超长源距声反射波测井数值模拟与远井界面成像  

Numerical simulation of acoustic reflected wave logging with excessively long source distance and imaging of interface far from the borehole

作　　者：宋立军[1] 马俊[1] 王克协[1] 

机构地区：[1]吉林大学物理学院

出　　处：《吉林大学学报（理学版）》2004年第4期586-590,共5页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:40074032);高等学校博士学科专项科研基金(批准号:20030183052).

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.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.

关 键 词：源距 反射波 时距曲线 同相轴 测井 井孔 声反射 点声源 界面 公式计算 

分 类 号：N04[自然科学总论—科学技术哲学] P631[天文地球—地质矿产勘探]