Moving point mechanism representation for low frewuency monopole borehole sensors

Kurkjian, A.; Hon, Bas de; White, J. E.; Hoop, Adrianus T. de; Marzetta, Thomas L.

doi:10.3997/2214-4609.201410690

Cited by 2 publications

(3 citation statements)

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“…That term in the radiation pattern originates from the motion of the three mutually orthogonal dipole sources, as pointed out by Kurkjian et al (1992). The numerical results in Ben-Menahem and Kostek (1991), for both the point source in a fluid-filled borehole and the above localized mechanism in an infinite solid medium, are in good agreement because their particular choice of parameters was such that 7r/4:<::: <p:<::: 37r/4…”

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confidence: 63%

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Tube waves, seismic waves and effective sources

1993

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A simple asymptotic analysis, based on the smallness of the ratio of the borehole radius to the wavelength, reveals the interaction between tube waves and seismic waves. The pressure field in a tube wave acts as a secondary source of seismic waves and conversely an incoming seismic wave excites a tube wave. The asymptotic analysis leads to a characterization of these sources in terms of the solution to two-dimensional elastostatic problems. These may be solved exactly when the borehole has an elliptical cross-section even in an anisotropic formation. Also the borehole need not be straight provided that its radius of curvature is large compared with a wavelength.

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Section: Cttsupporting

confidence: 63%

“…Kurkjian et al (1992) showed that the exact radiation pattern was obtained if the mechanism above was allowed to move up and down the borehole at the tube wave speed.…”

Section: Introduction the Aim Of This Papermentioning

confidence: 99%

Tube waves, seismic waves and effective sources

1993

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“…Kurkjian and co-workers [28,29] extended this approach by replacing the wave ®eld radiated by the source borehole with a moving system of effective seismic sources, to account for the conical S-wave radiation into slow formations. Furthermore, they employed a frequency lateral wavenumber integration code to determine the seismic wave-®eld quantities in the formation.…”

Section: Introductionmentioning

confidence: 99%

Wave motion between two fluid-filled boreholes in an elastic medium

Tadeu

Godinho

Santos

2002

Engineering Analysis with Boundary Elements

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The boundary element method (BEM) is used to fully simulate the propagation of waves between two¯uid-®lled boreholes. The sources are placed in one of the boreholes while the receivers are placed in the other. This model is frequently used in cross-hole seismic prospecting techniques to assess the characteristics of the elastic medium between the two boreholes. This work studies the dependence of the wave propagation patterns on the distance between the source and the receiver, their location and orientation relative to the axis of a circular borehole and type of elastic formation (fast and slow formations). In addition, this BEM model is used to compute the in¯uence of the deformed boreholes whose cross-section is not circular. Both the spectra responses and the time-domain responses are computed to elucidate the main physical features of the problem solved. q

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Moving point mechanism representation for low frewuency monopole borehole sensors

Cited by 2 publications

References 0 publications

Tube waves, seismic waves and effective sources

Tube waves, seismic waves and effective sources

Wave motion between two fluid-filled boreholes in an elastic medium

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