ZondRes2D — 2.5D electrotomography for resistivity and IP

ZondRes2D software is designed for 2D interpretation of electrical resistivity and induced polarization tomography (ERT and IP) data obtained during surface, borehole and off-shore surveys.

ZondRes2D belongs to the Zond family of programs. A unified interface and approach to data processing make it easy to familiarize yourself with operation of the entire package – in case you have the skills to work with one of the programs. Such approach makes it possible to provide joined processing and inversion of various geophysical techniques, what leads to a more stable and reliable geological and geophysical model.

ZondRes2D software can be installed on a computer with OS Windows 98 or later. For large datasets, calculations in the 64-bit version are available. ZondRes2d is a turnkey solution for ERT and solves a wide range of problems from mathematical modeling, observation system choice, data quality and sensitivity analysis, to processing, inversion and interpretation of field data. A user-friendly interface and great data presentation capabilities allow to solve the geological problem in the most effective way. The system for analyzing the quality of ERT data ensures the quick and efficient identification of problematic measurements in automatic and semi-automatic modes.

ZondRes2d deploys a simple and comprehensible data format that allows one to easily combine different electrical survey systems, including various options for setting the topography (including the bathymetry data of off-shore ERT) and other auxiliary information. Output files of the most popular geoelectrical equipment (Syscal, ABEM, AGI, Siber-48, Siber-64, Omega-48, ARES, ARES-II, complex MARY Smart + CommDD2 (48/64/72/80), complex SGD-EET MEDUSA + CommDD2 (48/64/72/80) are supported

ZondRes2d has a wide range of tools for mathematical modeling and analysis of sensitivity of DC and IP parameters what allows one to evaluate the signal level and choose the optimal parameters of setup in order to solve a geological task.

When developing the program, special attention was paid to considering a priori information. In ZondRes2d it is possible to assign weights to measurements, fix and set limits for changing the properties of individual cells, use an a priori model as a reference for inversion. In addition, the program implements robust schemes for evaluating the noise component. It is also possible to import and display measurements by other methods and well data, what contributes to a more comprehensive approach to data interpretation.

• Supported data types and preparation for inversion
  • Support of any type of survey arrays or their combinations with an arbitrary spacing and positions of electrodes
  • Measurements in a water layer and at the bottom of reservoir
  • Downhole and crosshole observations
  • Setting three coordinates for each electrode and taking into account arbitrary geometry of profiles
  • Many options for setting and editing topography data
  • Quality control module and ERT data editor
• Mathematical modelling and data inversion
  • Inversion options: smooth, focusing, robust, block
  • Modes of building a model when solving direct and inverse problems: grid, block, polygonal, arbitrarily layered model
  • Inversion of IP data, both according to the standard scheme, and in the time or frequency domain with the Cole-Cole parameters recovery
  • Full-wave inversion of IP parameters
  • Inversion of geoelectric monitoring data
  • Joint inversion with magnetotelluric data
  • Joint inversion with TEM and frequency sounding (FS) data
  • Joint inversion with refracted seismic data
  • Inversion of gravimetric and magnetic measurements data, including joint with ERT data
  • Complex polygonal modelling for magnetic, gravity and self-potential (SP) methods
  • Setting the start model and fixing the limits of parameters variation
  • Implementation of several a priori geological boundaries during inversion
  • Suppression of curve disturbances caused by local heterogeneities - P & C-effects
• Working with geoelectrical models
  • Working with multiple models in one project
  • Assessment of the solution quality based on the sensitivity matrix. Calculation of the quality parameter of the obtained solution and depth of investigation
  • 3D visualization of geoelectric sections using an arbitrary system of profiles. Depth-slice maps of various parameters
  • Geological editor allows to set real boundaries. Taking into consideration the borehole data is also available via the corresponding software module
  • Export of data containing sounding elements to the ZondIP1D program for fitting a geoelectric model in 1D variant
  • Converting a set of 2D files into one file for selecting a 3D geoelectric model in the Zondres3d program
  • Export to raster and vector graphic formats, Excel, Surfer, Autocad, Geosoft

More details on the functionality of the software can be found by downloading the user manual, demo-version or by watching video reviews and tutorials.

The ERT data processing software ZondRes2D is offered in several configurations.

ZondRes2D Standard - full-featured configuration of the program for processing ERT and IP data in land, borehole and marine variants. In this configuration, options are available for joint inversion with data obtained by other methods, full-wave inversion of IP data and inversion of geoelectrical monitoring data.

ZondRes2D Light - intended only for resistivity data processing and inversion. The processing of IP data is not available.