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Two-dimensional smoothed inversion of resistivity and induced polarization data


  • Supports Wenner electrode installations, three-electrode, dipole, two-electrode and Schlumberger installations
  • Direct support for instrument file formats, including the Syscal series of receivers
  • Increased spacing installation support
  • Support 256 colors for screen graphics
  • 256 color support for the most common industrial plotters
  • Adjustment of the scale and installation of contour parameters are made by the user
  • Terrain Correction
  • Inversion option
  • Inversion of resistivity and induced polarization data
  • Display the inversion process in text or graphic mode
  • Regulation of the number of iterations by reducing the magnitude of the error, or the magnitude of the absolute error
  • Four ways to determine damping
  • Possibility to choose between ridge regression methods and Occam's inversion
  • Partial derivative management using approximated or complete solutions
  • Options for performing quasi-Newtonian correction for all or selected iterations during the inversion

general information
RESIX 2DI is an interactive, graphical inversion program designed to interpret sensing data by the resistance method and polarization induced data. The RESIX 2DI program performs 2-dimensional cell-based inversion, which is limited by the pseudo-section of resistivities. The program supports Wenner electrode installations, three-electrode, two-electrode, dipole and Schlumberger installations. The only limitation that is imposed on the number of sources and used electrodes of the receiver is the speed of your computer and the size of its memory.

RESIX 2DI calculates the direct response of a homogeneous half-space using the finite element method. After that, she performs a quick inversion of the apparent resistivity by the least squares method, using the nonlinear optimization method.

The regularization methods used to stabilize the inversion are of two types: the first is based on the Occam Principle - it optimizes the smoothness of the model; the second is based on the ridge regression algorithm - it minimizes the error of the least squares method.

In addition, there is an exact inversion method in which the partial derivatives of all the data are calculated, and then the inversion is performed. The resulting smoothed model can then be stored in a binary file on a direct-access disk for later reading and display.

Terrain corrections are introduced by calculating the response to a change in resistivity of a 1-ohm homogeneous geological environment that has a relief. These calculated values can then be decomposed into synthetic calculations (leaving the data intact), or they can be divided directly into research data.

The smoothed model, in turn, can be used as a template for creating polygonal initial models, as well as in the RESIX IP2DI Program for interpreting resistivity data and induced polarization on a page.

Standard components
RESIX 2DI v1 software, and instruction manual.

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