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Resix IP - IP Modeling Software

1 Dimensional Forward and Inverse Modeling of DC Resistivity and Induced Polarization


RESIX IP is an interactive, graphically oriented, forward and inverse modeling program for interpreting induced polarization (IP) and resistivity sounding data in terms of a layered earth (1-D) model.

RESIX IP has all the features of RESIXPLUS with the following exceptions where the program was adapted to incorporate Induced Polarization (IP) data.

Sounding curves can be entered as a function of a for Wenner or pole-pole soundings, AB/2 for Schlumberger soundings, R for dipole soundings or N for dipole-dipole or pole-dipole soundings. Apparent resistivity data can be interpreted with or without apparent polarization data.

Forward modeling enables you to calculate synthetic IP/resistivity sounding curves for a model with up to 10 plane layers. IP readings can be entered in units of mSec-V/V or in percent frequency effect (PFE).

Inverse modeling enables you to obtain a model that best fits the data in a least squares sense. Starting models for inversion can have up to 7 layers if both resistivity and polarization parameters are included, or up to 10 layers if only resistivity parameters are included. Forward models can have as many as 10 layers. Constraints can be applied by fixing (or freezing) a parameter, or by imposing limits on a parameter. Parameters can be resistivity resistivity + thickness of layers, or resistivity + depth to bottom of layers. If IP data are present, each layer has an additional parameter, either chargeability or PFE, according to the choice of data type.

Equivalence analysis allows you to generate a set of equivalent models, (that is, alternative models that fit the data nearly as well as the best-fit model, but differ from this model). Equivalence analysis also indicates the allowable range hof model parameters. Smooth modeling enebles you to automatically interpret resistivity and IP sounding data in terms of a smooth model with up to 19 layers. The model depths are logarithmically spaced and are determined from a minimum and maximum depth. The depth range can be user-specified or automatically generated. Inversion can be carried out in either interactive or batch mode, using ridge regression or William of Occam's smooth model concept. Results can be plotted, printed, listed on the screen or written to an ASCII file for use by user-supplied or third party software.

The MODEL SUITE command enables you to construct a collection of forward models by specifying one or more different values for a parameter.  You can also generate new electrode spacings. This enables you to see the results of a specific change to the original model.

Standard Components

Resisx IP v2 software and manual