Oakwood Computing®'s Gundalf™ is the airgun source modelling software. And integrated seismic interpretation, in time and depth, grids and contour maps. Gundalf: Marine Seismic Airgun Modelling Software Package Gundalf is a state of the art Windows or Linux-based airgun source modelling software package based on many years of research. Airgun array computer modelling is an enormously cost-effective exercise given the cost of downtime of a seismic survey vessel for signature tests or concerns about the effects of drop-out. In the processing centre, simple knowledge of the acquisition geometry and gun types allows an accurate signature to be generated for sophisticated signature deconvolution. It has taken a number of years to refine understanding of the physics of airgun bubble interaction to its current level but it now offers a genuine alternative to the very costly experimental approach or the uncertainties inherent in near-field extrapolation. Gundalf™ is capable of modelling source arrays of up to 128 guns for all modern gun types including the very latest Bolt eSource™, with full interaction allowed between them. Linear superposition of sub-arrays or even individual guns as has often been used, is rejected in favour of full physical modelling. No scientific compromise is made here, the physics at the heart of Gundalf™ is capable of modelling the phase locking observed in closely-interacting airguns right down to the edge of the super-foam region. It contains arguably the most advanced physics of its kind anywhere. Gundalf™ is rigorously calibrated against large datasets of signatures recorded in specialist facilities. The system is available in two forms, Designer and Optimiser, both of which use the same state of the art physical modelling engine. Gundalf Designer • Enables the geophysicist to model the signature of up to 128 fully interacting airguns in an array quickly and accurately. • Includes all modern gun types including Bolt eSource and Long Life, Sercel G and GI guns and sleeve guns (all trademarks noted) in its array construction palette. • Simple graphical interface to add, edit or delete guns, change the depth of all guns, manipulate sub-arrays, zooming and numerous other shortcuts. Each gun can be individually set in position, gun type, volume and operating pressure allowing complete flexibility. • Signature characteristics such as peak to peak, primary to bubble and bubble period are produced on demand complete with model error bounds derived from calibration. • Amplitude spectra and any filtering can be done at the click of a button. The resulting plots are interactive giving an instantaneous check on the signature statistics with just a click of the mouse. • Sophisticated handling of the surface reflection ghost and optionally the cable ghost using rough sea surface modelling. • Import and export of signatures in both text and SEGY format. • Import and export of arrays in text format allowing full arrays with symmetric sub-arrays to be built quickly and easily, (noting that all interactions are always used when actually modelling the array). • Intranet reporting with comprehensive array report produced in a form suitable for a company Intranet including embedded web graphics for the array geometry, maximum bubble radii, signature and amplitude spectrum and colour contour plots of inline and cross-line directivity and also range/range. • Sophisticated drop-out analysis using a wide range of industry standard criteria in both the time and frequency domains with automatic identification of illegal drop-out combinations.
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Март 2019
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