Anisotropic Seismic Noise Gradiometry with Finite Difference Stencil Correction

Sjoerd De Ridder; Andrew Curtis

doi:10.1190/segam2016-13777425.1

Abstract / Description of output

We introduce an anisotropic wavefield gradiometry technique to estimate phase velocities from seismic surface wave noise. The method inverts a two-dimensional wave equation, equating the spatial and temporal derivatives of the wavefield amplitudes
with elliptically anisotropic medium parameters. The derivatives are evaluated using finite differences which causes anisotropic velocity errors. A two step approach corrects this error. Finite difference stencils are first calibrated, then the output of the wave-equation inversion is corrected using the linearized impulse response to the inverted velocity anomaly. We test the procedure on ambient seismic noise recorded in a large and dense array installed over Ekofisk field. The azimuthal anisotropy forms a circular geometry around the production induced subsidence bowl which is confirmed by results from controlled source and noise-correlation studies. The methodology is a promising technique for studying changes in the subsurface geomechanical stress-state resulting from timedependent phenomena operating over short time-scales.

Original language	English
DOIs	https://doi.org/10.1190/segam2016-13777425.1
Publication status	Published - 1 Sept 2016

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title = "Anisotropic Seismic Noise Gradiometry with Finite Difference Stencil Correction",

abstract = "We introduce an anisotropic wavefield gradiometry technique to estimate phase velocities from seismic surface wave noise. The method inverts a two-dimensional wave equation, equating the spatial and temporal derivatives of the wavefield amplitudeswith elliptically anisotropic medium parameters. The derivatives are evaluated using finite differences which causes anisotropic velocity errors. A two step approach corrects this error. Finite difference stencils are first calibrated, then the output of the wave-equation inversion is corrected using the linearized impulse response to the inverted velocity anomaly. We test the procedure on ambient seismic noise recorded in a large and dense array installed over Ekofisk field. The azimuthal anisotropy forms a circular geometry around the production induced subsidence bowl which is confirmed by results from controlled source and noise-correlation studies. The methodology is a promising technique for studying changes in the subsurface geomechanical stress-state resulting from timedependent phenomena operating over short time-scales.",

author = "{De Ridder}, Sjoerd and Andrew Curtis",

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T1 - Anisotropic Seismic Noise Gradiometry with Finite Difference Stencil Correction

AU - De Ridder, Sjoerd

AU - Curtis, Andrew

N1 - This is an oral presentation at a conference with an abstract, online it shows a red padlock and 'no access'. I've closed the AAM and changed the template to 'Conference contribution meeting abstract'. GS 30/07/19.

PY - 2016/9/1

Y1 - 2016/9/1

N2 - We introduce an anisotropic wavefield gradiometry technique to estimate phase velocities from seismic surface wave noise. The method inverts a two-dimensional wave equation, equating the spatial and temporal derivatives of the wavefield amplitudeswith elliptically anisotropic medium parameters. The derivatives are evaluated using finite differences which causes anisotropic velocity errors. A two step approach corrects this error. Finite difference stencils are first calibrated, then the output of the wave-equation inversion is corrected using the linearized impulse response to the inverted velocity anomaly. We test the procedure on ambient seismic noise recorded in a large and dense array installed over Ekofisk field. The azimuthal anisotropy forms a circular geometry around the production induced subsidence bowl which is confirmed by results from controlled source and noise-correlation studies. The methodology is a promising technique for studying changes in the subsurface geomechanical stress-state resulting from timedependent phenomena operating over short time-scales.

AB - We introduce an anisotropic wavefield gradiometry technique to estimate phase velocities from seismic surface wave noise. The method inverts a two-dimensional wave equation, equating the spatial and temporal derivatives of the wavefield amplitudeswith elliptically anisotropic medium parameters. The derivatives are evaluated using finite differences which causes anisotropic velocity errors. A two step approach corrects this error. Finite difference stencils are first calibrated, then the output of the wave-equation inversion is corrected using the linearized impulse response to the inverted velocity anomaly. We test the procedure on ambient seismic noise recorded in a large and dense array installed over Ekofisk field. The azimuthal anisotropy forms a circular geometry around the production induced subsidence bowl which is confirmed by results from controlled source and noise-correlation studies. The methodology is a promising technique for studying changes in the subsurface geomechanical stress-state resulting from timedependent phenomena operating over short time-scales.

U2 - 10.1190/segam2016-13777425.1

DO - 10.1190/segam2016-13777425.1

M3 - Abstract

ER -

Anisotropic Seismic Noise Gradiometry with Finite Difference Stencil Correction

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