Experimental Study on Shear Wave Reflection of a Borehole Dipole
Source Excitation

doi:10.3863/j.issn.1674–5086.2013.06.001

Abstract

Abstract:

Through related experimental studies on dipole shear wave remote detection measurement-mode，we study shear
wave reflection of a borehole dipole source excitation from near-borehole formation interface，and measure full waveform inside
and outside borehole under different source positions，different polarization directions and different formation interface
characteristics. The experimental results show that a dipole source in a fluid-filled borehole excites direct flexural wave propagating
along borehole and outside borehole，but also radiates two types of shear wave，which are SH-wave and SV-wave，
respectively. Along with the dipole polarization direction from 0° to 90°，reflected shear wave amplitude gradually decreases，
and verified that the dipole source for near-borehole reflector has obvious azimuthal directivity characteristics，which can be
used for determining near-borehole geological structure strike. Under the solid-liquid or solid-gas formation interface characteristic，
total reflection of SH-wave at the reflector interface will happen，and mode conversion occurs to SV wave，so SH-wave
reflection helps to remote detection imaging，and has unique advantages for fractures.

Key words: dipole source, reflected shear wave, physical simulation, polarization directions, interface properties

Wei Zhoutuo, Chen Xuelian. Experimental Study on Shear Wave Reflection of a Borehole Dipole
Source Excitation[J]. 西南石油大学学报(自然科学版), DOI: 10.3863/j.issn.1674–5086.2013.06.001.

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