纵波速度径向层析成像分析
发布时间：2018-08-28 12:17
【摘要】：钻井会造成近井壁附近岩石的声学性质改变,为研究纵波径向探测特性,本文使用径向柱状分层模型,应用二维轴对称有限差分法详细考察了过渡带厚度、声源频率以及接收器源距变化下,单极子测井响应的变化特征,并采用慢度-时间相关法研究了不同条件下所测量到的声速变化。最后基于射线理论,分析了不同条件下的首波到时变化特征。基于地层速度逐渐增加的模型表明,纵波的径向探测特性受源距影响较大,通过不同源距信号的组合,可以实现对近井壁纵波速度进行层析成像。
[Abstract]:Drilling will change the acoustic properties of rocks near the wellbore. In order to study the radial detection characteristics of longitudinal waves, the thickness of the transition zone is investigated in detail by using the radial columnar stratification model and the two-dimensional axisymmetric finite difference method. The characteristics of the response of monopole logging with the variation of source frequency and receiver distance are studied. The measured changes of sound velocity under different conditions are studied by using slow-time correlation method. Finally, based on the ray theory, the first wave arrival characteristics under different conditions are analyzed. Based on the model of increasing formation velocity, it is shown that the radial detection characteristics of P-wave are greatly affected by source distance, and the tomography of longitudinal wave velocities near well wall can be realized by the combination of different homologous distance signals.
【作者单位】： 中国科学院声学研究所声场与声信息国家重点实验室;中国科学院大学;北京市海洋深部钻探测量工程技术研究中心;
【基金】：国家自然科学基金项目(11374322,11574347)
【分类号】：O429
本文编号：2209371
[Abstract]:Drilling will change the acoustic properties of rocks near the wellbore. In order to study the radial detection characteristics of longitudinal waves, the thickness of the transition zone is investigated in detail by using the radial columnar stratification model and the two-dimensional axisymmetric finite difference method. The characteristics of the response of monopole logging with the variation of source frequency and receiver distance are studied. The measured changes of sound velocity under different conditions are studied by using slow-time correlation method. Finally, based on the ray theory, the first wave arrival characteristics under different conditions are analyzed. Based on the model of increasing formation velocity, it is shown that the radial detection characteristics of P-wave are greatly affected by source distance, and the tomography of longitudinal wave velocities near well wall can be realized by the combination of different homologous distance signals.
【作者单位】： 中国科学院声学研究所声场与声信息国家重点实验室;中国科学院大学;北京市海洋深部钻探测量工程技术研究中心;
【基金】：国家自然科学基金项目(11374322,11574347)
【分类号】：O429
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1 笪天锡;超声在测试物体内平自由表面上反射特异现象的研究[J];重庆大学学报(自然科学版);1983年02期
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