A versatile system with intuitive and easy-to-use processing tools and numerous inversion options for geoelectrical resistivity data. Desktop example.

Watch how easy it is to get started (wmv, 2 min, 0.7 Mb)

Main features

• Any resistivity data set that can be written in the dat-file format for RES2DINV can be used.
• A comprehensive processing system allowing users to view data as soundings, pseudo-sections or sections. Bad data points can be removed or extra noise added to individual data points or series of data points. Example.
• Smooth 2D inversion through a fully integrated user interface for RES2DINV. Example.
• 1D-LCI inversion of data sets. Both multi-layer and few-layer inversions are supported.
• Comprehensive visualization features enabling detailed evaluation of the inverted data.

The GIS-map is an integrated part of the module enabling map-view of individual electrodes or sounding positions. Topography is also supported.

Asymmetrical electrode configurations such as gradient array type data or dipole-dipole data are fully supported and the visualization tools are designed to handle these configurations.

Processing of geoelectrical resistivity data

The data processing part of handling geoelectrical resistivity data is often not paid much attention to because the tools needed are not available. With the DC module for Aarhus Workbench they are now! We have made a comprehensive processing toolbox for geoelectrical resistivity data. Processing headlines are:

• Section views of data with individual electrodes, data curves and pseudo section.
• Sounding views of data based on accurate data positioning from the lateral focus point of the different configurations. Averaging of coincident configurations can be applied.
• Disable or enable bad data points or add extra noise to data points.
• Croos-linked plots so that clicking on a single electrode on the electrode plot selects all data points measured using that electrode and vice versa.

Inversion of geoelectrical resistivity data

The inversion module for resistivity data features two main approaches and one up-coming:

• 1D laterally constrained inversion of soundings. This can be either with smooth models or layered inversions with few sharp boundaries. This is described in more detail under the inversion module.
• 2D smooth inversion with the widely used RES2DINV program. The DC module has a built-in interface for RES2DINV with easy access to the most commonly used tools in RES2DINV. Full access to all settings in RES2DINV are available through the inversion parameters file (ivp-file). RES2DINV runs hidden and results are read back to the Aarhus Workbench giving access to all visualization features available. The program running RES2DINV also works as a stand-alone viewer for inv-files from RES2DINV. Inversion results can be filtered based on their deviation from the observed data and re-runs can be made on the filtered data.
• 2D laterally constrained inversion is being implemented at the moment. It is a layered 2D inversion with lateral constraints designed specifically for resistivity data. We expect to release in the winter 2008/2009.

The inversion routines are described in detail in the papers listed in the resistivity part of publications section.

Licensing

The DC processing and inversion system is a module of the Aarhus Workbench program. Recommended setups are listed on the Licensing page.