Hi Fatemah,
Geosoft has a HEM half-space resistivity module called:
82010 HEM Data Processing and Plotting System
My version did run version 6.4, although that was a few years and several
major versions ago. Not sure if you can add that to such an old version of
Montaj.
Like Jeff, I caution you on the physics of the half-space inversion and also
on the data itself. Levelling of the EM data for zero baseline is more art
than science in many cases.
If the half-space resistivity values are not supplied, then it probably is
an older dataset. My suggestion is to send it out to one of the EM
processing firms to reprocess and level and then invert. That’s what I do.
Bob
----------------------
Bob Lo, M.Sc., MBA, P.Eng.
Consulting Geophysicist
-----Original Message-----
From: Gamey, Jeffrey T
Sent: Monday, February 03, 2014 1:13 PM
To: Geosoft Oasis montaj and Target
Subject: RE: [geonet] Analysis airborne EM data
Fatemah-
I don't think that's possible in Geosoft, although others may correct me.
You'll have to use a third party package such as those in the ENCOM suite.
If you really want to do this in Geosoft, you'll have to write your own
inversion code.
There is also a less elegant approach that is mathematically simpler and
does not require you to compile new gx code or to buy new software. You can
create a phasor diagram for the particular system you have, write it out as
a GRD file, then use the "Sample Grid" routine with your inphase and
quadrature data as X and Y coordinates. The hard part in this, of course,
is creating the phasor diagram in the first place. It avoids the need for
programming knowledge, but requires some skill in EM theory.
All of these alternatives should be compatible with Oasis 6.4.
Good luck.
-Jeff
*************
Jeff Gamey, Battelle, PG, PMP
cell 865-599-0820 fax 614-458-0275
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of fatemah
Sent: Monday, February 03, 2014 9:34 AM
To: Geosoft Oasis montaj and Target
Subject: [geonet] Analysis airborne EM data
Hi
How can i calculate resistivity from HEM data in geosoft oasis(6.4)?
Can someone help me?
Thank you
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