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Windows 11

IX1D-mTEM
1D Marine Sounding Inversion

IX1DmTEM is a 1-D Marine electromagnetic sounding inversion program with the following features:

• Supports TEM Inline E, crossline H, broadside E, joint inline E with  crossline H and (coming soon) multiple offset E-field soundings.
  

• Supports step current on, step current off or current impulse.
  

• Supports Frequency domain inline E and broadside E data.
  

• Supports isotropic or anisotropic resistivity models.
  

• 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 copied to the model in the current data set for further modeling. The log can be read in as an isotropic or anisotropic (vertical and horizontal) resistivity. For anisotropic models, the cumulative resistance is also displayed and can be used to create layer boundaries.

Features include:

• Creation of data by spreadsheet entry or copy/paste from another spreadsheet.
  

  

  Data Type and Parameter Dialog Box

  

  DC Resistivity Voltage/Current Data Entry Dialog Box

   

• Import of data or models from flat ASCII files.
   

• Models are entered from the keyboard or copy/pasted from a spreadsheet as either Depth models or Layer Thickness.
  

  
  Model Entry Dialog Box

   

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

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

• Menu commands and toolbar buttons are available for estimating a smooth model or analyzing equivalence of the layered model.

• Supports model suite generation for isotropic and anisotropic models, allowing variation of single layer resistivity, thickness or depth, source receiver offset, sea depth or resistivity, transmitter depth or a second model can be faded in. Existing data can be displayed with curve suite. Time base can be from existing data or generated from parameters.
  

Model Suite Dialog

• Smooth models are generated by starting with as many layers as the user desires. Thicknesses are automatically generated from the min and max depths specified 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 sounding window display can be set to show the layered model, smooth model, equivalence analysis or any combination of these three.
   

Sounding Window Graphics Screen

• 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.
   

• Axis 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 Smooth models.
  

• Many soundings can be included in a single data base file. Sounding types can even be mixed. Soundings are displayed on a map in the main window; geometry of the soundings is displayed as well.

Display of Soundings in Map Coordinates.

• Profile data are exported directly from the data processing software, MarineQaQc

Display of inline E Data with data displayed as pseudosection and smooth model displayed as a colored section

Display of Inline E Data with apparent resistivity data displayed as curves on a Zaborovsky plot and smooth model displayed as a colored section.

• Forward modeling, inverse modeling, smooth model estimation and equivalence analysis can be carried out individually or in batch or pseudo-batch mode.

• Profiles and soundings can be selected by name or by point and click at a map location. Soundings on a profile can be selected by point and click on a profile location.

• A model can be copied to the model clipboard and then back to an individual sounding, all soundings on a profile or to every sounding in the database.

• Creation of data by spreadsheet entry or copy/paste from another spreadsheet.

• Import of data or models from flat ASCII files 

• Models are entered from the keyboard as either Depth models or Layer Thickness or copy/paste from another spreadsheet.

• Layer boundary elevations are shown and calculated relative to surface, sea bottom or keyboard elevations. 

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

• Fix Flags allow 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 in the Sounding Window 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.

• Menu commands and toolbar buttons are available for estimating a smooth model or analyzing equivalence of the layered model. These appear on the sounding window and on the profile window. Using the command from the profile window executes a pseudo-batch operation where each sounding along the profile is processed in turn.

• View Properties are available for the sounding window, the profile window and the map window. Axes in the map window are never vertically exaggerated. View Properties for the profile window allows for control of the resistivity color fill range and parameters.
  

  

  Axes Label Properties

   

• When smooth model estimation is started from the Profile window, smooth models are generated by starting with the same starting model for each sounding along the profile. The user selects the number of layers, the starting and ending depths and the starting resistivity. The model begins with a homogeneous earth (all layers set to the specified resistivity). Inversion can be Ridge Regression or Occam's inversion.

• The display in the sounding window can be set to show the layered model, smooth model, equivalence analysis or any combination of these three. For DC Resistivity data, 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. For colored section displays, the smooth model section is displayed if View/Smooth is selected; otherwise the layered model is displayed.

Model Suite window showing 3 curves for varying offsets with the same anisotropic model.

• For MT data, the Bostick and Niblett inversions can also be shown. 

• Soundings can be selected for display from the map window if no profile is displayed. Or they can be selected from the Profile Window.

Sounding Display Window showing smooth model, layered model and equivalence analysis.

• 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.

• Axis 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.
  

Resistivity Well log shown with layered model decomposition

Licensing and Distribution

IX1D version 3 is distributed as copy-protected software. The software can be downloaded and it works fully only with the demo data supplied. The license allows for a 30-day evaluation period. After the evaluation you are required to purchase the package in order to continue using it. Purchase price is US$999.00 for DC, IP, MT,  Frequency EM and EM Conductivity capabilities. The price for for TEM is an US $3,499.00. Both licenses are offered with your choice of USB or Parallel key.

Licensed Versions

Licensed users can obtain e-mail support by sending requests for assistance, bug fixes and feature enhancements to info@interpex.com Please include the serial number, version number and attach the files with which you are having problems to your e-mail request.

The newest version can be downloaded from this website and will work with your licensed hardware key. Updates are free if you download them from our web site.