|
The computed response for all the programs listed below is designed to match data in the units
used by the various input instruments. This approach enables direct comparison between observed and modelled responses
PLASI - Forward modelling of a simple conductive plate in an air host. The plate is simulated
as a single eigencurrent in air resulting in extremely fast operation. Real time interactive
modelling is possible with this program. TDEM survey types which can be simulated are
coincident, in-loop, fixed (Turam) mode, slingram and downhole (multi-component).
OZPLTE - Forward modelling of a simple conductive plate in an air host but using a
definable number of eigencurrents. Plate simulation is slower than PLASI but produces
much greater response accuracy. The program can also cache geometric computations to
speed up repeat modelling. OZPLTE can operate on the same survey configurations as PLASI.
SPASYM - Forward modelling of a conductive sphere in a homogeneous conductive host. This program
will operate for the in-loop and coincident survey configurations. Computation is fast and
modifications to the physical properties of the conductive sphere or host can be easily
achieved resulting in near real-time interactive operation.
LAYER - This algorithm is a forward modelling program which accommodates almost all surface
EM survey configurations. LAYER can simulate up to 20 individual stratified layers with
both real and complex (Cole-Cole) earth properties. Individual layer properties and
resistivities can be simulated at various reading locations such that the modelled
theoretical geology can be complex.
GRENDL - This program can operate either in a forward or inverse mode. GRENDL computes the
voltage response on the surface of a horizontally layered half-space using a rectangular
transmitter loop excited by a bi-polar square waveform. For the inversion case, the user
can design a series of 'seed' models which are varied during processing to minmise errors
using standard inversion techniques. Layer resistivity and thickness properties can be held
fixed if required. GRENDL operates only for the in-loop and coincident field survey modes.
LEROI - This forward program computes the voltage response of two layers with a
conductive plate embedded in the lowest, basement layer. EM coupling between the surface,
basement and conductive plate are accurately computed. The program operates for most
surface EM survey configurations and the layers can have both real and complex earth properties.
FILAMENT - This modelling algorithm provides both forward and inversion functionality with
fixed loop (Turam) surface EM data or downhole surveys. The program simulates a single
filament in air which can be either circular or rectangular in shape. Inversion can be
undertaken over a series of different time decays iterating one at a time. Inversion
using this program is fast and interactive and provides the user with good visual feedback
of the source location, 'smoke-ring' effect and early-mid-late time response transition.
|
Company Profile
