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Shear-horizontal transverse-electric seismoelectric waves in cylindrical double layer porous media

Chinese Physics B 2021年第1期30卷 288-294页

作者： Wei-Hao Wang Xiao-Yan Zhu Jin-Xia Liu Zhi-Wen Cui Department of Acoustics and Microwave Physics College of PhysicsJilin UniversityChangchun 130012China

The shear-horizontal(SH) waves excited by the shear source in a borehole are easy to analyze due to the simple waveform. The borehole-side structures make the formation properties discontinuous. We consider a cylindrical double layer structure and study the borehole shear-horizontal and transverse-electric(SH-TE) seismoelectric waves. We first derive the expressions of the basic field quantities, and simulate the acoustic field and electric field using the real axis integral method. Compared with the wave fields of an infinitely homogeneous porous medium outside the borehole, the cylindrical layered structure makes the multi-mode cylindrical Love waves and their accompanying electric fields ***, in order to study the interface response law of the inducing electric fields, we use the secant integral method to calculate the interface converted electromagnetic waves and analyze the causes of each component. It is found that an interface response occurs each time the SH wave impinges the interface in the layered porous medium. The results show that the SH-TE mode has a potential application for borehole-side interface detection in geophysical logs.

关键词： seismoelectric effect shear-horizontal and transverse-electric waves cylindrical layer porous media

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seismoelectric wave propagation modeling in a borehole in water-saturated porous medium having an electrochemical interface

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Chinese Physics B 2017年第12期26卷 345-354页

作者：丁浩然刘金霞崔志文 Tribikram Kundu Department of Acoustics and Microwave Physics College of Physics Jilin University Department of Civil Engineering and Engineering Mechanics University of Arizona

Water-saturated porous media often exhibit a seismoelectric effect due to the existence of an electrical double layer and a relative flow of pore fluid. Here we consider the seismoelectric waves in an open borehole surrounded by water-saturated porous formation which exhibits discontinuity of electrochemical properties at a cylindrical interface. We carefully analyze the seismoelectric interface response since these signals show sensitivity to contrasts in electrochemical properties across an interface. Both coupled and approximate methods are used to compute borehole seismoelectric fields. The simulation results show that the radiated electromagnetic wave from the electrochemical interface is generated due to the change of salinity in pore fluid in the porous formation. However, the elastic properties of the formation remain unchanged across such an electrochemical interface. As a result it is difficult to recognize such a change in electrochemical properties using only elastic waves. Therefore, the seismoelectric interface response is potentially used to detect the changes of the electrochemical properties in the formation.

关键词： seismoelectric effect interface response porous formation borehole

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Research and experimental testing of a new kind electrokinetic logging tool

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Applied Geophysics 2014年第4期11卷 364-373,508页

作者：李丰波鞠晓东乔文孝卢俊强门百永中国石油大学油气资源与探测国家重点实验室北京102249 北京市地球探测与信息技术重点实验室北京102249

We designed a new downhole electrokinetic logging tool based on numericalsimulations and petrophysical experiments. Acoustic and electric receivers cannot be arrangedat the same depth, and the proposed composite electrokinetic logging tool offers a solutionto this problem. The sound field characteristics of the detectors were tested in a water tank inthe laboratory. Then, we calculated the sound pressure of the radiated acoustic field and thetransmitting voltage response of the transmitting transducers; in addition, we analyzed thedirectivity and application of the acoustic transmitting probe based on linear phased *** results suggest that the sound pressure generated at 1500 mm spacing reaches up to 47.2k Pa and decreases with increasing acoustic source frequency. When the excitation signalsdelay time of adjacent acoustic transmitting subarrays increases, the radiation beam of themain lobe is deflected and its energy gradually increases, which presumably enhances theacoustoelectric conversion efficiency.

关键词： electrokinetic logging seismoelectric well logging seismoelectric effect electrokinetic effect acoustoelectric effect sound field

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