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Mississippi Delta Transition-Zone Depth Imaging Multiclient Seismic Survey

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The Mississippi Delta Depth I–IV and Cameron-Vermilion Depth 1 surveys are of areas with well-established production, but both offer further exploration opportunities, especially at greater depths than explored by previous drilling (deeper than 20,000 ft).

Improved imaging around salt flanks and overhangs should also lead to identification of new targets.

The Cameron-Vermilion Depth 1 survey of ultradeep structures at the Lower Tertiary Frio and Wilcox levels also suggests additional opportunities.

Map showing the Mississippi Delta transition-zone depth imaging.
Map showing the Mississippi Delta transition-zone depth imaging.

Survey challenges, processing, and interpretation

  • Transition from land to water
  • Poor data resulting from low signal-to-noise ratio
  • Statics issues, including large mud lump and trench features
  • Merge of 11 land surveys acquired with various energy sources
  • Multiples and interbed multiples
  • Anisotropic velocity model building

Processing highlights

To address the extreme statics found in traditional transition zones, these surveys were processed with

  • diving-wave tomography
  • refraction tomography
  • refraction and reflection statics routines.

Once the preprocessing has been completed, we can begin depth imaging with full-azimuth tomography for improved anisotropic velocity model building and with improved multiple attenuation that results from better near-offset coverage.

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