Introduction
Welcome to the Webpage for CSIRO/AMIRA's
P223 code suite.
The suite was developed at CSIRO over 25 years with industry support through
various AMIRA consortia. At the end of the final project (P223F), sponsors
agreed that the code should be released into the public domain.
Practical three-dimensional electromagnetic inversion for exploration
CSIRO has conducted mathematical and algorithm research to develop practical geophysical
software tools for the minerals exploration industry. The project, called P223F,
created a suite of software for airborne and ground electromagnetic (EM) systems
(time or frequency domain) that enables users to model and invert for:
- Layered earth models and hosts.
- Individual plates and more complex undulating structures that can
be composed from plates.
- Arbitrary structures, including topography, within a limited three-dimensional
(3D) domain.
P223F, or Practical Three-Dimensional (3D) Inversion for Exploration, was the ninth
project for AMIRA International, an industry association which manages collaborative
research for members of the global minerals industry.
Project goals
The aims of this project were to:
- deliver a suite of well-documented, robust modelling and inversion
programs in the form of ANSI standard FORTRAN 95 source code and as Windows compiled
executables
- produce graphical user interfaces for the modelling and inversion
processes
- work with sponsors to help them get the most out of the inversion
and forward modelling software
- conduct workshops at sponsors’ meetings, specific on-site workshops
tailored to individual sponsor priorities, and internet communication and software
delivery
- provide maintenance and feature augmentation of existing programs
as required.
Background to the project
The project extended upon work developed over more than 25 years and included the
following modelling and inversion software:
- Airbeo: Layered earth inversion for airborne EM
- Grendl: Layered earth inversion for ground EM and joint
inversion of ground EM and resistivity
- Leroi and LeroiAir: Thin sheet integral equations
for 3D plates with any orientation embedded in layered earth hosts
- Arjuna and ArjunAir: 2.5D (2D geology, 3D source)
finite elements for models where the geoelectric section varies slowly with respect
to strike
- Samaya and SamAir: Compact finite elements for limited
3D domains in a layered earth host, including topography and high contrast unconformities
- Loki and LokiAir: Edge element finite elements for
3D full domains, including topography and high contrast (1:1 000 000) unconformities
- Marco and MarcoAir: Volume integral equations with
pulse basis functions for 3D prisms embedded in a layered earth host; automated
group symmetry reductions for faster operation; suitable to conductivity contrasts
of 1:300.
Electromagnetic modelling group
The electromagnetic modelling group consists of:
- Dr Art Raiche (contractor)
- Dr Fred Sugeng (currently with PGS)
- Dr Glenn Wilson (currently with TechnoImaging).
Partners and sponsors
Project sponsors were:
Software partners were:
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