Reflection waveform inversion imaging driven by redatuming in ultra-deepwater area
Offshore petroleum exploration beyond the continental shelf is characterized by high risk and substan-tial investment,necessitating high precision in structural imaging and reservoir prediction.Traditional velocity modeling method based on ray theory often fails to meet the demands for fine imaging.In ultra-deepwater explo-ration,seismic observations are challenged by the thick seawater layer,resulting in extended recording times and immense data and model spaces,making large-scale application of wave theory-based velocity modeling dif-ficult.To address this,this paper proposes a reflection waveform inversion imaging technology driven by reda-tuming.This technology mitigates the seismic wave propagation effects in the seawater layer,reducing data vol-ume,compressing model space,and alleviating velocity-depth ambiguity,thereby enabling the practical applica-tion of full waveform inversion in deep-sea environments.Due to the limited detection distance in ultra-deepwa-ter area,recording the first arrival wave with sufficient depth penetration is challenging,preventing its use in waveform inversion for velocity updates.Consequently,this paper employ reflection waveform inversion for the redatumed data to achieve a high-precision velocity model and imaging results.Synthetic data from theoretical models and actual data processing results from Block A in the South China Sea demonstrate that this technology significantly reduces data volume and enhances the efficiency of high-precision velocity modeling.It holds promising potential for improving ultra-deepwater oil and gas exploration.
ultra-deepwaterstreamerredatumingreflection waveform inversionreverse time migrationve-locity modeling
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