IX1D v3 is a 1-D Direct
Current (DC) resistivity, Induced Polarization (IP), Magnetotelluric (MT)
and electromagnetic sounding inversion program with the following features:
Supports Most DC
resistivity arrays, including: Wenner, Schlumberger Dipole-dipole
Pole-dipole and Pole-pole arrays.
Resistivity only or Resistivity with IP measurements in terms of PFE,
Chargeability in msec or Phase in mrad.
Magnetotelluric (MT) sounding inversion with Apparent Resistivity
and Impedance Phase.
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.
Conductivity measurements in terms of apparent conductivity in
measurements taken with central loop, fixed loop or coincident loop
- 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.
All features of IX1D v2
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.
Profile data such as GEM-2,
MaxMin and EM-31/34/38 can be imported from XYZ files.
- Profiles can be created from existing soundings and displayed as
Zaborovsky plots, profile plots or pseudosections.
Model sections along
profiles can be displayed as Zaborovsky plots, profile plots or colored
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 in the same manner as with IX1D v2.
Import of data or models
from flat ASCII files
Models are entered from the
keyboard as either Depth models or Layer Thickness in the same manner as
with IX1D v2.
- 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
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
Forrward 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. 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. 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.
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.
GEM-2 data interpreted
with 3 layers; layered resistivities are fixed and only thicknesses are
allowed to vary.
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. The Sounding Window looks much like
the main window in IX1D v2.
Sounding Display Window showing smooth model, layered model and
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
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
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.
The standard version containsr DC, IP, MT, Frequency EM and EM
Conductivity capabilities. The registration for for TEM is additional
with extra costs. Both licenses are offered with your choice of USB and Parallel
users can obtain e-mail support by
sending requests for assistance, bug fixes and feature enhancements.
Please include the serial number, version number and attach the files with
which you are having problems to your e-mail request.