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Modeling of borehole radar for Well Logging Using Pseudo-spectral Time Domain Algorithm

Journal of Earth Science 2009年第6期20卷 978-984页

作者：林树海 Key Laboratory of Geo-detection (China University of Geosciences Beijing) Ministry of Education School of Geophysics and Information Technology China University of Geosciencess Beijing

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.

关键词： borehole radar well logging pseudo-spectral time domain algorithm conductivity permittivity.

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Influence of fracture width on borehole radar response

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Global Geology 2021年第2期24卷 111-118页

作者： YAN Weicun LIU Sixin CHANG Xinghao RAN Limin ZHAO Yonggang LI Jianwei College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China North China Petroleum Engineering Company SINOPECZhengzhou 457000China

Fracture is a common underground structure phenomenon,which can provide space and passage for the storage and migration of oil and *** radar is a fast and high-resolution geophysical detection method,which has been widely used in engineering,exploration and other *** paper mainly uses theoretical analysis and numerical simulation to study the variation law of the characteristics of the received borehole radar signal with the variation of fracture *** Ricker wavelet is used as the pulse signal of the borehole *** results show that the amplitude of the signal received by the borehole radar first increases,then decreases,and finally tends to be a stable value with the increase of fracture *** results have guiding significance for the detection of underground fractures and the estimation of fracture width by borehole radar.

关键词： borehole radar fracture width amplitude numerical simulation

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