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Well-Driven Seismic Previous HitProcessingNext Hit and Reservoir Characterization

By

 Stephen Patrick Morice1, Stefano Volterrani2, Tarek Nafie2, Ayman Shabrawi2

(1) WesternGeco, Gatwick Airport, United Kingdom (2) WesternGeco, Cairo, Egypt

 Our “Well-Driven” approach to surface-seismic Previous HitprocessingNext Hit integrates borehole Previous HitdataNext Hit throughout the Previous HitprocessingNext Hit sequence to achieve accurate depth images with enhanced resolution, and constrained reservoir attributes from the seismic and well Previous HitdataNext Hit.

Borehole Previous HitdataNext Hit are used to guide pre- and post-stack seismic Previous HitprocessingNext Hit testing by quantifying the match between migrated test volumes and the synthetic seismogram or VSP corridor stack (e.g. Poggiagliolmi, 1998; Scott et al., 1999). Attributes based on the correlation between well Previous HitdataNext Hit and the seismic Previous HitdataNext Hit at the well location, and on characteristics of the extracted wavelet provide objective criteria for Previous HitprocessingNext Hit parameter selection.

Intrinsic Previous HitprocessingNext Hit parameters are derived from analysis of VSP and log Previous HitdataNext Hit. An Earth model of P- and S-wave velocities, densities, attenuation and VTI anisotropy is built at the well location and extended over 2D or 3D. The model is used to drive offset-dependent attenuation compensation, geometric spreading corrections, demultiple operators, long-offset move-out corrections, ray-trace-based muting, travel-time tables for pre-stack depth migration and AVO analysis (Leaney et al., 2001).

Crucial to our method is appropriate conditioning of well Previous HitdataNext Hit. Sonic and density curves are edited using a multi-well regression scheme through interactive, iterative calibration to VSP and surface-seismic Previous HitdataNext Hit.

With the seismic Previous HitdataNext Hit Previous HitprocessingNext Hit sequence optimized to the borehole Previous HitdataNext Hit, we may proceed with greater confidence into seismic interpretation and the derivation of reservoir attributes through calibration and classification of seismic attributes with petrophysical and rock-physical borehole Previous HitdataNext Hit. This paper describes our borehole-integrated Previous HitprocessingTop and reservoir characterization methodology, showing examples from several recent projects.