Marine Seismic Source Modelling

As part of Verif-i’s Marine Seismic Source QC solution, we can offer state-of-the-art airgun modelling using an industry-standard package. Extensive sets of field data have calibrated the software to simulate the source signature of a marine seismic source.

Verif-i’s modelling service provides the following:

• Source signature modelling & statistics
  ◦  Far-field and near-field signature with ghost reflection modelling
  ◦  Primary to bubble ratios & bubble periods
  ◦  Centre of Source (Geometric), Centre of Energy, & Centre of pressure computations
  ◦  Optional pre and post filtering – user defined, Q, Wiener, Band-pass
  ◦  Individual energy contribution of each gun highlighting any guns that may be catalysing the array by absorbing energy.
  ◦  Source signature directivity analysis showing angle-frequency, angle-amplitude and dip-azimuthal plots.
• Drop Out Analysis
  Gun drop out analysis with 1, 2 or 3 gun drop out modelling showing allowable, prohibited and “allowable with spare” matrices
• Array comparison
  Provides statistics for each array with side-by-side differences and superimposed plots showing amplitude spectrum and time signatures.
• Fully documented reporting in PDF format
  Comprehensive PDF reports showing array geometry – plan and elevation views, array configuration and all modelling statistics. Inline and crossline directivity plots and time signature and amplitude spectrum plots. Also provided is a gun dropout calculator used to interrogate the model in real time for acceptable/unacceptable gun drop out permutations. PDF reports are supplemented with full sets of ascii raw data and industry standard SEGY seismic traces used during the modelling process.