Unlocking the potential of narrow-azimuth streamer acquisition with extended FWI and least-square RTM: A case study for an Eastern Mediterranean field

Le résumé fourni par la source

The Eastern Mediterranean province contains world-class producing fields and large exploration potential. Subsalt imaging with narrow-azimuth seismic has inherent challenges that limit ability to constrain reservoir characterization. The imaging challenges include non-flatness of reservoir fluid contact, fault shadow, structure undulation, low signal-to-noise, and lack of stratigraphic resolution. Seismic reimaging of asset was conducted using Chevron’s proprietary Extended Full Waveform Inversion (Ext-FWI) and Least Square Reverse Time Migration (LSRTM). The reimaging result shows Extended FWI is effective in deriving a high-resolution and more geological velocity model from the narrow-azimuth acquisition. The combination of Extended FWI and LSRTM offers significant improvement in subsalt reservoir imaging, including: 1) Flatter and more interpretable reservoir fluid contact; 2) Better imaged faults; 3) More continuous reservoir structure; 4) Less swing noise and much higher S/N; and 5) Less noisy and more reliable amplitude compliant gathers and angle stacks for AVO and inversion. The improvement of subsurface understanding from the reimaging is expected to enhance reservoir characterization and lead to more realistic reservoir models that will be used to optimize development well planning.

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