MODELING OF BOREHOLE RADAR FOR WELL LOGGING USING PSEUDO-SPECTRAL TIME DOMAIN ALGORITHM

• 来源期刊: 地球科学学刊(英文版)
• 学科: 地球科学
• 年，卷（期）: 2009,（6）
• 页码范围: 978-984
• 页数: 7页
• 分类号: P631.81
• 语种: 中文

摘要

In this article, numerical modeling of borehole radar for well logging in time domain is developed using pseudo-spectral time domain algorithm in axisymmetric cylindrical coordinate for proximate true formation model. The conductivity and relative permittivity logging curves are obtained from the data of borehole radar for well logging. Since the relative permittivity logging curve is not affected by salinity of formation water, borehole radar for well logging has obvious advantages as compared with conventional electrical logging. The borehole radar for well logging is a one-transmitter and two-receiver logging tool. The conductivity and relative permittivity logging curves are obtained successfully by measuring the amplitude radio and the time difference of pulse waveform from two receivers. The calculated conductivity and relative permittivity logging curves are close to the true value of surrounding formation, which tests the usability and reliability of borehole radar for well logging. The numerical modeling of borehole radar for well logging laid the important foundation for researching its logging tool.