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Migration Workflow

Running BE® before migration provides an increase in spatial resolution. The improvements come from three sources. First, the increase in the bandwidth pre-migration will reduce both vertical and lateral wavelets post-migration and increase both vertical and lateral resolution. Second, the sharpness of the gathers before migration allow for a much more accurate initial velocity model. This in turn allows for a more accurate stacking velocity model, which translates into a more accurate interval velocity model. Third, after migration, since the common image gathers are higher resolution, this will allow for a more accurate picking of depth errors and horizons to go into our tomographic updating software.

Needless to say, high resolution seismic coupled with high resolution velocity demands a high resolution set of migration parameters, so things like bin spacing, offset spacing, depth sample and spatial velocity sampling for updating need to be revisited after BE®. The resulting image will provide a better representation of the subsurface structure and stratigraphy.

Flow:
  • BE® run on final un-migrated gathers
  • Hi-res migration velocity model building
  • PSTM or PSDM with High Resolution data and velocities as input
  • Gather Conditioning
  • Stack

Benefits:

  • Improved spatial (lateral and vertical) resolution
  • Sharper, crisper faults
  • Better imaging of thin stratigraphic reservoirs
  • Best possible input to pre- or post-stack inversion, OVT, Pore Pressure Prediction

Conventional PSTM BE Imaging

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BE® Imaging Input Data Requirements

Minimum Processing:

  • Geometry Application and Corrections
  • Spherical Divergence
  • Shot Domain Noise Attenuation (if necessary)
  • Deconvolution
  • Refraction Statics and Residual Statics
  • No NMO correction applied
  • Data should be at the same datum as the velocities
  • Any final datum correction should be in the headers for application at a later time

Required Header Information:

  • Source Line and Source Station
  • Source X and Y
  • Receiver Line and Receiver Station
  • Receiver X and Y
  • CMP-X and CMP-Y
  • Inline and Crossline
  • Unique Ensemble Identifier (Field File Number or CDP Number)
  • Final Datum Correction Value


BE® Imaging

 

Common Technologies
Land
Marine
Time Lapse
Depth