Gulf of Mexico E-Wave | Schlumberger

Gulf of Mexico E-Wave

Advanced imaging project

The E-Wave advanced imaging project covers over 1,800 OCS blocks across four protraction areas, spanning some of the most prospective acreage in the subsalt Middle to Lower Miocene, Lower Tertiary (Wilcox), and subsalt Pliocene plays.

Notable fields and discoveries in the area include Tahiti, K2, Heidelberg, Shenandoah, Buckskin, Moccasin, Lucius, and Hadrian.

The region is characterized by a variety of structural styles and complex salt geometries, including deep suprasalt minibasins, amalgamated salt stock systems, and tabular salt canopies.

Map showing the E-Wave advanced imaging project in the Gulf of Mexico.
E-Wave advanced imaging project.
Map showing the E-Wave advanced imaging project in the Gulf of Mexico.
Data example shows E-Wave advanced imaging project results.
Enhanced imaging: subsalt and intrasalt.

Survey challenges, processing, and interpretation

  • Multiple attenuation and elimination
  • Accurate determination and application of tilted transverse isotropy (TTI) anisotropic parameters
  • Building of accurate, detailed velocity model
  • Integration of well velocity information
  • Accurate, detailed seismic imaging
  • Verification of imaging through well ties
  • Subsalt velocity determination
  • Accurate interpretation and refinement of salt bodies
  • Intrasalt velocity determination
  • Subsalt illumination
  • Well tying and integration

Processing highlights

Advanced data processing technologies used to address these geophysical challenges include

  • true azimuth 3D GSMP generalized surface multiple prediction and attenuation
  • well-controlled provision of initial TTI anisotropic parameters
  • benchmarking of well velocities and depths throughout data processing
  • 3D prestack acoustic full-waveform inversion (FWI) using wave equation to produce high-resolution velocity models
  • FWI iterations performed on the supersalt sediments, salt body, intrasalt velocity variation, and the subsalt
  • accurate imaging in presence of structural and velocity complexities through two-way prestack wave equation reverse time migration (RTM)
  • monitoring of imaging improvement and refinement of salt body interpretation throughout processing with RTM.

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