Combination of 1D laterally constrained inversion and 2D smooth inversion of resistivity data with a priori data from boreholes

Near Surface Geophysics - Tập 3 Số 2 - Trang 71-79 - 2005
Roger Wisén1, Esben Auken2, Torleif Dahlin1
1Department of Engineering Geology Lund University Box 118 S‐221 00 Lund Sweden
2HydroGeophysics Group; Department of Earth Sciences; University of Aarhus Finlandsgade 8; DK-8200 Aarhus N Denmark

Tóm tắt

ABSTRACTResistivity imaging in combination with borehole information is a powerful tool for site investigation. We show that the combination of 1D laterally constrained inversion (1D‐LCI) with the use of a priori information from borehole data and 2D smooth inversion adds significant value to the interpretation of continuous vertical electrical sounding (CVES) data. The 1D‐LCI offers an analysis of the resolution of the model parameters. This is helpful when evaluating the integrity of the model. Furthermore, with the 1D‐LCI it is possible to constrain model parameters with a priori information, e.g. depth‐to‐layer interfaces, based on borehole information.We show that 2D smooth inversion resolves lateral changes well, while 1D‐LCI results in well‐defined horizontal layer interfaces. In geological environments where the lateral variations are not too pronounced, the 1D‐LCI contributes to a geological interpretation of the resistivity measurements. Depths to layers can be interpreted with greater certainty than if using results from 2D smooth inversion only. The inclusion of a priori information in the inversion reveals further details and enhances the geological interpretation significantly.

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Near Surface Geophysics

Tập 3 Số 2

71-79

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