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transient electromagnetic interpretation


Display & Interpret EM Data
EM Vision 2.3 is an interactive software product for displaying and interpreting ground transient EM data. The software is the result of collaborative research by CSIRO (The Commonwealth Scientific and Industrial Research Organisation), Encom and the exploration industry through AMIRA (Australian Minerals Industries Research Association Ltd).


Increased Functionality
EM Vision operates under Windows with flexible options for data display and interpretation.


Data & Survey Control
Data can be input from standard EM instrument files or located AMIRA format files. EM components and multiple traverses can be read. Survey confi gurations such as borehole,
fixed loop, in-loop, coincident
loop and slingram are supported. Selection criteria for the processing of repeat readings is provided via a spreadsheet interface linked to graphical displays of the data.
Definable Instruments
EM Vision supports a wide range of standard instruments. Included are SIROTEM Mk 2 and 3, EM-37 and PROTEM, Crone and Zonge
GDP-xx. In addition, it is possible to define instruments by a
configurable
transmitter waveform and receiver delay time file defined graphically or by text.

Flexible Views
Data can be displayed as log-log or log-linear profiles, stacked profiles, contour maps and pseudosections
of voltage, apparent  resistivity and conductivity. Graphically selected
individual readings can be displayed as decay curves and analysed by power, exponential and linear fits.
Batched profiling enables large survey jobs to be displayed and printed with titles and annotation.
Powerful Modelling
Forward and inverse EM modelling are provided. Forward modelling
offers plates, block models or layered earths while inverse modelling is available for layered earths.
Three-component EM borehole or surface modelling is supported.

Real-time graphics displays of observed and computed responses (or apparent
resistivities or conductivities) are
presented during layered inversion. If inappropriate inversion seed models are initially selected, the
inversion can be halted, the model revised, and inversion re-initiated.

Comparisons between theoretical and
observed data responses are easily
created using various displays.
The EM Vision Display and
Analysis core module can be used with the following options:

Multi-Layer Modelling
Forward and inverse modelling of real and complex layered earths

Multi-Plate Modelling
Simulation of responses from multiple coupled and uncoupled targets in air and layered earths

Block Modelling
Fully coupled multiple 3D blocks in a multi-layered complex earth host

Downhole Modelling
Single or 3-component vector data with modelling for coupled and uncoupled
plate conductors in air or layered earths.



Forward Modelling Features

Graphical or menued plate
and layer positioning

Perspective and section/plan views for plate and layer models

Compute on demand with
algorithm selection

Comparative displays of theoretical responses with observed data in
profiles, contours or decays

Inverse Modelling Features

Graphical or list selection of readings and channels for input control

Batched computation or
compute-on-command

Real-time comparison of decay voltage or apparent resistivity during iterations

Inversions can be halted if the model is inappropriate

Models can be revised and
the inversion re-initiated

Optional Modelling Algorithms

SPASYM
Forward modelling of a sphere in air or in a conductive half space
Coincident Loop and
In Loop confi gurations

PLASI
Forward modelling of multiple, uncoupled plates in air using a single eigencurrent

Coincident Loop, In Loop, Fixed Transmitter, Slingram and Downhole confi gurations
OZPLTE
Forward modelling of multiple uncoupled plates in air using multiple eigencurrents

Coincident Loop, In Loop, Fixed Transmitter, Slingram and Downhole configurations

LAYER
Forward modelling of layers
and complex earths
Coincident Loop, In Loop, Fixed Transmitter, Slingram and Downhole configurations

GRENDL
Forward and inverse modelling of layers
Coincident Loop and
In Loop confi gurations

BEOWLF
Forward and inverse modelling of layers and complex earths In Loop, Fixed Transmitter and
Slingram confi gurations

LEROI
Forward modelling of multiple, coupled plates in a two-layer earth Coincident Loop, In Loop, Fixed
Transmitter, Slingram and
Downhole confi gurations

MARCO
Forward modelling of multiple coupled
blocks in a multi-layered earth Coincident Loop, In Loop, Fixed Transmitter, Slingram and Downhole configurations
Survey & Instruments
Standard survey configuration
support for in-loop, fixed, coincident, slingram and borehole

Instrument specifications for SIROTEM Mk 2 and 3, EM-37, PROTEM, Crone
and Zonge GDP-xx through TEMAVG

User definable instruments supported

Instrument specifi cations
include decay times, initial delay, ON/OFF time, rise times

Transmitter and receiver
waveforms can be defi ned
graphically or by text editing

Data Display
Log-log and log-linear profiles with channel selection

Control over line styles, scaling, colours, symbols etc

Decay and apparent resistivity displays for individual, graphically
selected readings

Contoured maps of selected channel voltage, apparent resistivity, dB/dT or conductivity

Depth slicing using conductivity or resistivity derived depths

Pseudo-section displays of voltage response, apparent resistivity or conductivity-depth sections

Optional image or posting of data

Stacked profiles of voltage or resistivity for selected channels

Vector displays of  theoretical and borehole component responses

Log displays of borehole EM responses

Batch control of profile printing with titling and annotation

Variable substitution to provide intelligent plotfile creation

  HarbourDom GmbH 2012             impressum