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IX1D - 1D Inversion Software


Data Entry Dialog Box

IX1D is a 1-D Direct Current (DC) resistivity and Induced Polarization (IP) inversion program with the following features:

  • Supports Most DC resistivity arrays, including: Wenner, Schlumberger Dipole-dipole Pole-dipole and Pole-pole arrays.

  • Supports Resistivity only or Resistivity with IP measurements in terms of PFE, Chargeability in msec or Phase in mrad.

  • IX1D has the capability to read in a resistivity well log from a flat ASCII file and the user can interactively reduce the log to several discreet layers by fitting straight line segments to the cumulative conductance in the log. The resulting model can be copies to the model in the current data set for further modeling. 

Features include:
  • Creation of data by spreadsheet entry

  • Import of data or models from flat ASCII files 

  • Models are entered from the keyboard as either Depth models or Layer Thicknes

  • Layer boundary elevations are shown and calculated relative to surface elevations. 

  • The Model Entry dialog box allows for dynamic column and row manipulations to make model entry more convenient. 

  • Fix Flags allows the user to fix parameters for the inversion calculations. Either the layer thickness (or depth) and/or the resistivity can be fixed in the inversion process. 

  • Forward and inverse model calculations can be carried out using buttons on the model entry dialog. Models can be inverted using either the layer depth or layer thickness.

  • Graphics are presented as the Sounding data on the left hand side with the model on the right hand side. Interactive property sheets allows for user configuration of displayed data. For DC and IP data, the model can be displayed on the same axes as the data. 

  • Menu commands and toolbar buttons are available for estimating a layered model (DC and IP data only), estimating a smooth model or analyzing equivalence of the layered model.

  • Smooth models are generated by starting with as many layers as there are data points. Thicknesses are automatically generated from the spacing or frequency data and the model begins with a homogeneous earth (all layers set to the average resistivity found in the data). Inversion can be Ridge Regression or Occam's inversion. 

  • The display can be set to show the layered model, smooth model, equivalence analysis or any combination of these three. The model(s) can also be shown on the same graph as the data, in which case the spacing axis doubles as a depth axis. 

  • The model and data plots can be zoomed by dragging the mouse across the display with the left button depressed. This feature can be switched on and off by clicking on the Zoom menu command in the View menu or by clicking on the Zoom tool bar icon. 

  • Axes labels as well as axis sizes can be edited under View Properties. Grid lines, including major and minor, for the Data and Model axes can be switched on and off under the View Grid menu subchoices. Axes can be auto-scaled from the model and data by selecting the View Unzoom menu command. 

  • Data, Layered models and Smooth models can be exported to ASCII files. 

  • Graphics can be exported as DXF, CGM or WMF file formats. 

  • Tool bar buttons are provided for the most-used menu commands, including New Sounding or Model, Open and Import data, Save, Print, Edit Data or Model, Zoom status, Unzoom, model display selection, Forward, Inverse and Equivalence Analysis calculations, and Estimation of Layered or Smooth models.


Model entry Dialog Box


Axes Label Properties


Resistivity Well log show with layered model interpretation


Default Graphics Screen