Encom EM Flow
For fast electromagnetic imaging of the sub-surface
The fastest EM processing system available, Encom EM Flow displays, analyses and interprets single or multi component airborne time and frequency domain EM data.
Fast and Effective Data Processing
Encom EM Flow is a fast and effective system for the display, processing and interpretation of time and frequency domain EM data for geological mapping, orebody search, salinity and other environmental applications.
A typical EM survey produces 500 line kilometres per day and averages 40,000 transients, with between 12 to 256 samples in each. This results in up to 50 million data points being acquired per survey day!
Manual interpretation of this data volume is slow and previous quantitative inversion techniques using conventional layered approximations take 20 seconds per reading (on a fast PC), this equates to 278 hours or 12 days of computation time for one day of flying and data collection.
Encom EM Flow uses the EM algorithms developed by Pitney Bowes Software and CRC-AMET for an Australian Minerals Industry Research Association (AMIRA) funded project. EM system waveforms are used to deconvolve measured EM multi-component and multi-channel line data. Interactive user controls provide progress information on data processing, resulting in the display of conductivity depth images (CDIs).
In less than one hour Encom EM Flow can process and produce interpretation products from a day’s EM survey data.
NOTICE: Because we offer many custom solutions, it is our policy not to post pricing on our website. Please contact our knowledgeable staff to select and price products that fit your organisation's budget, number of users, IT environment, data requirements, support and training needs. We apologise for any inconvenience.
Real-Time Monitoring of Processing
Encom EM Flow is designed to operate on large EM datasets and provide conductivity depth sections plus anomaly identification and modelling tools. The program operation is usually tailored by processing one or two lines and then applying the parameters to the remainder of the survey or specified lines.
Encom EM Flow is able to process almost any configuration of transient or frequency domain electromagnetic survey and does so by converting the instrument response to the equivalent pure square wave response. In this way, all subsequent processing can be performed with the assumption of a pure square waveform. This method is fast and reduces the complexity of coding required for direct modelling of different instrument types.
Conversion of observed EM data to the time constant (Tau) domain is achieved by deconvolving the line data with pre-computed basis functions. The deconvolution is presented graphically allowing real-time monitoring of the processing.
Additional Product Views
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Encom EM Flow Features
Conductivity-Depth Sections:
CDI section processing is customised using component weighting with selected tau, depth intervals and depth ranges. The result of the CDI processing can be displayed in EM Flow or output to a Geosoft GDB database or ASCII file display in Encom PA Explorer or Geosoft Oasis montaj. Conductivity depth sections are presented in pseudo colour using log or linear colour stretchs. If a topographic channel is available, then the CDI section can be suspended from the topography.
EM System Definition:
An interactive editor is provided to allow the EM system’s geometry, transmitter waveform and calibrations to be specified. An interactive formatter simplifies input file definition so that waveform specifications can be imported from external programs, such as Microsoft Excel.
Data Import:
An interactive import utility provides a generic interface for most EM multi-column ASCII file types, including Geosoft. Additional utilities to define the EM system waveform, recorded time windows and transmitter-receiver geometry are also included.
3D Integration:
Encom PA Explorer and Encom PA Professional are optionally used for extended visualisation capabilities and integration with other geophysical and geological information. Encom PA products support 1D, 2D, Section and 3D visualisation methods.
Data Format
Data is imported from ASCII files and processed depth-conductivity data is stored in a Geosoft Oasis GDB database. This includes receiver data, waveform and timing gates. A specialised EM editor is used to assist with data imports.
System Description
Enter information on the waveform type, normalisation method, transmitter current waveform, receiver waveform sampling type and transmitter-receiver geometry configuration types (TxRx,TxRz,etc)
System Geometry
Define the x,y,z offsets for each transmitter-receiver combination (TxRx, TxRz etc.).
Receiver Waveform Time domain waveforms for each transmitter-receiver pair require window definitions with start and end times plus the scale factors required to convert measured waveform to correctly scaled values.
Frequency domain waveforms for each transmitter-receiver pair provide details of each waveform frequency and frequency scale factor.
Descriptor File
Each survey uses a descriptor file to hold information about the system geometry, waveform and data formats and is often provided by airborne survey contractors. Examples for many EM systems are supplied with Encom EM Flow.
Parameter File
A parameter file (.PAR) tracks the file information and processing parameter history for a specific project and is used for restarting a project. It is also used to provide an audit trail of processing parameters.
Support
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