Emix MM Plus Frequency
Electromagnetics Processing Software
General
EMIX MMPlus allows for foward and
inverse modeling of EM data acquired with instruments
such as the GENIE/HLEM or the MAXMIN systemas in terms
of layered earth models and thin plate conductors. EMIX
MMPlus can interpret data from both the MAXMIN and GENIE
systems
EMIX MMPlus computes the layered
earth forward model using the full solution described by
H.P. Patra and K. Mallick in Geosounding Principles, 2
(1980) published by Elsevier. The inversion calculation
uses the Inmanstyle ridge regression approach of
nonlinear least squares curve fitting.
The total number of layers for
layered earth models is 7. The program calculations
allow for VARIABLE coil spacings and also takes the
instrument height into consideration. A floating
constant compensates for the spacing errors in TX and RX
separation.
EMIX MMPlus interprets and presents
data collected in profile form in terms of both layered
earth models and thin plate conductors. Support for
the GENIE/HLEM is now standard with this package. The
program uses data acquired in the HLEM mode.
EMIX MMPlus lets you divide the
data into five segments along the profiles and then fix
individual model parameters for each of the four
segments.
The Genie option was developed to
accommodate the measurements of the Genie HLEM
Instrument. This instrument is useful in rugged
terrain, since it measures total field at two
frequencies and combines them to form the "Genie
Anomaly". In addition to allowing EMIX Plus to model
this Genie Anomaly, it is also better for MaxMin and
other instruments that measire inphse and quadrature
components of the secondary field. The program now has
forward and inverse modeling for conductors, instead of
a direct inversion.
The dip, depth and conductance of
the thin sheet are specified, and the argand diagrams
are interpolated to find the inphase and quadrature
values. The Wesley algorithm is used to find the curve
shape, using the depth and the angle. The curve is then
scaled to yield the inphase and quadrature responses.
In case of the Genie, this is done for the low and the
high frequencies and combined to form the Genie Anomaly.
This means a starting model can be specified, or
manually interpret without using inversion is possible.
It also means that there is a single interpretation for
dip angle and width. There is no longer a need to edit
thr argand interpretation, since there is now a forward
modeling mode.
The response for conductor models
can be calculated for all the frequencies without
copying the conductor to all the frequencies,
effectively "filling" in the synthetic data with the
response from the selected conductors. The program does
a forward calculation of the conductors to adjust for
the frequency and then an inversion to adjust for the
base values. Conductors can also be copied specified
frequencies.
Calculated layered earth responses
or "filled" conductor responses from the field data can
be "removed" from the data by subtracting the synthetic
responses from the field data.
Standard Conponents
Emix MM Plus v.3 software and
manual
