Experimental studies of the acoustic wave field near a borehole
Name
Zhu_etal_Eperimental_studies.pdf
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341.77 KB
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Checksum (MD5)
15efb6ced7f7d4f81c0fcf4dc9c2fd2d
Author(s)
Zhu, Zhenya
Liu, Xien
Gu, Chen
Toksoz, M. Nafi
Date Issued
2013
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;2013-13
Abstract
A monopole or a dipole source in a fluid borehole generates acoustic waves, part of which propagate along the borehole and the other part enter the formation propagating as P- or S-waves. The refracted waves propagating along the borehole wall are used to determine P- and S-wave velocities. However, a significant fraction of the seismic energy radiates into the formation. In this laboratory study, we measure the acoustic waves in the borehole and the seismic waves in the formation at different distances from the borehole.
We use scaled borehole models made of Lucite and of concrete to simulate a soft and a hard formation, respectively. The waveforms are measured in the boreholes as well as in the formations with different radial distances from the axis of the borehole. The results show that the investigation depth of the wave measured in the borehole is less than one half of the wavelength. The seismic energy radiating into the formation and scattered from interfaces and heterogeneities can be used for imaging the formation.
Subjects
Scattering
Imaging
Persistent DSpace Link
