CSEM Sensitivity Analysis Through Resolution Functions for Migration and Inversion

Slob, Evert; Mulder, W.A.

doi:10.3997/2214-4609.20149485

Cited by 1 publication

(2 citation statements)

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“…We do this by modelling an isotropic homogeneous half-space and compute the multicomponent response to a unit-impulse source for all source-side and receiver-side fields. In order to test our approach, we first investigate the scalar resolution function for a conductivity point perturbation for a purely EM scenario as derived by Slob and Mulder (2011). Figure 1-a shows the EM resolution function for inversion where both the two-way field operator as well as the data were computed through the use of explicit analytical homogeneous-space Green's function solutions (Slob and Mulder, 2011).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In order to test our approach, we first investigate the scalar resolution function for a conductivity point perturbation for a purely EM scenario as derived by Slob and Mulder (2011). Figure 1-a shows the EM resolution function for inversion where both the two-way field operator as well as the data were computed through the use of explicit analytical homogeneous-space Green's function solutions (Slob and Mulder, 2011). as well as the data have been computed using the forward modelling code ESSEMOD, where we assume that there is no coupling between mechanical waves and electromagnetic fields.…”

Section: Numerical Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Electromagnetic and Seismoelectric Sensitivity Analysis Using Resolution Functions

Maas¹,

Grobbe²,

Slob³

et al. 2015

Proceedings

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SUMMARYFor multi-parameter problems, such as the seismoelectric system, sensitivity analysis through resolution functions is a low-cost, fast method of determining whether measured fields are sensitive to certain subsurface parameters. We define a seismoelectric resolution function for the inversion of a bulk density perturbation. The synthetic data and Green's functions required to construct the resolution function are computed using the seismoelectric modelling code ESSEMOD. First, we consider the purely electromagnetic problem with a conductivity perturbation at a single point in an isotropic homogenous half-space. The result is nearly identical to a published result based on analytical Green's functions. It correctly maps the position of the scatterer. Next, we perform an electromagnetic sensitivity analysis for the case of a layered background medium. Again, the resolution function is capable of correctly mapping the scatterer when it is above as well as below a layer of increased conductivity; although in the latter case with less resolution. Finally, we generate multi-component synthetic data with our forward modelling code and compute the seismoelectric resolution function for inversion of a bulk-density perturbation. We find that the seismoelectric system is sensitive to a perturbation in bulk density and that the position of the perturbation can be correctly recovered.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%