Sensitivity of IP Surface Measurements to Subsurface Anisotropy
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| Title: | Main Title: Sensitivity of IP Surface Measurements to Subsurface Anisotropy |
| Description: | Abstract: Induced polarisation (IP) data recorded at the field scale are usually interpreted using techniques based on isotropic electrical properties, despite the common occurrence of anisotropy in the subsurface. We propose an anisotropic IP inversion algorithm to overcome this limitation. Our approach is based on the established code CRTomo, which supports the inversion of isotropic complex conductivities (magnitude and phase angle) from 2D frequency-domain IP data. In order to extend the algorithm for the support of anisotropic complex conductivities, we modified the underlying forward modelling and sensitivity implementations. The anisotropic complex sensitivities form the basis of the overall inversion results, because they determine the iterative model updates. In previous studies, we presented typical anisotropic complex sensitivity patterns and stated the possibility to resolve anisotropic complex conductivities even from surface measurements. The proposition was based upon the existence of non-vanishing patterns in for all regarded anisotropic complex sensitivties. However, mostly equal sensitivity patterns with respect to, e.g., x and y conductivity, which we observed, suggests that these conductivities cannot be resolved separately. We address the question of resolution with regard to anisotropic complex conductivities by presenting sensitivities with respect to anisotropy ratios. They are computed from the previously used anisotropic complex conductivities by applying the standard chain rule. Because of complex calculus, multiple possible derivations are of interest. We focus on the anisotropic sensitivity with respect to a horizontal-vertical anisotropy ratio, which we present as variation in measured voltage magnitude or phase angle due to a variation in the anisotropy ratio magntitude or phase angle, respectively. We present corresponding synthetic anisotropic inversion results to reflect the possible resolution for anisotropic complex conductivities. |
Responsible Party
| Creators: | Johannes Kenkel (Author), Andreas Kemna (Author) |
| Publisher: | CRC/TR32 Database (TR32DB) |
| Publication Year: | 2016 |
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File Details
| Filename: | DGG_2015_Kenkel.pdf |
| Data Type: | Text - Text |
| File Size: | 2.5 MB |
| Date: | Created: 22.03.2015 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Free |
| General Access and Use Conditions: | According to the TR32DB data policy agreement. |
| Access Limitations: | According to the TR32DB data policy agreement. |
| Licence: | [TR32DB] Data policy agreement |
Geographic
Specific Information - Presentation
| Presenter: | J. Kenkel |
| Presentation Date: | 23rd of March, 2015 |
| Presentation Type: | Poster |
| Event: | DGG |
| Event Type: | Other |
| Event Location: | Hannover |
| Event Duration: | 23rd of March, 2015 - 26th of March, 2015 |
Metadata Details
| Metadata Creator: | Johannes Kenkel |
| Metadata Created: | 20.07.2016 |
| Metadata Last Updated: | 20.07.2016 |
| Subproject: | A3 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 581 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 3 |
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