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IX1D v 2
1D Sounding Inversion
See also the newer version IX1D v 3
IX1D is a 1-D Direct Current
(DC) resistivity, Induced Polarization (IP), Magnetotelluric (MT) and
electromagnetic sounding inversion program with the following features:
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Supports Most DC resistivity arrays,
including: Wenner, Schlumberger Dipole-dipole
Pole-dipole and Pole-pole arrays.
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Supports Resistivity
only or Resistivity with IP measurements in terms of PFE, Chargeability in
msec or Phase in mrad.
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Supports
Magnetotelluric (MT) sounding inversion with Apparent Resistivity and
Impedance Phase.
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Supports Horizontal
Coplanar, Vertical Coplanar and Vertical Coaxial Frequency-Domain
Electromagnetic in-phase and quadrature measurements made versus frequency,
coil spacing or instrument height. Measurements can be in percent or ppm
of the primary field.
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Supports EM
Conductivity measurements in terms of apparent conductivity in
milliSiemens/m.
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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.
Features include:
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Creation of data by spreadsheet
entry
Data Entry Dialog Box
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Import of data or models from flat
ASCII files
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Models are entered from the
keyboard as either Depth models or Layer Thicknes
Model Entry Dialog Box
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Layer boundary elevations are shown and
calculated relative to surface elevations.
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The Model Entry dialog box allows
for dynamic column and row manipulations to make model entry more convenient.
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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.
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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.
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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.
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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.
Axes Label Properties
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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.
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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.
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For MT data, the Bostick and
Niblett inversions can also be shown.
Default Graphics Screen
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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.
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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.
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Data, Layered models and Smooth
models can be exported to ASCII files.
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Graphics can be exported as DXF,
CGM or WMF file formats.
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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 show with
layered model decomposition
Licensing and Distribution
IX1D
version 2 is distributed as shareware. Registration fee is for DC, IP,
Frequency EM and EM Conductivity capabilities. The registration for for TEM is
an additional and requires a hardware key. Both USB and Parallel keys
are available
Registered Versions
Registered users can obtain e-mail support by sending requests for assistance,
bug fixes and feature enhancements.
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