Technical Paper: Limitations of 2D Deghosting and Redatuming in Time-Lapse Processing of Towed-Streamer Data

Society: EAGE
Paper Number: We D03
Presentation Date: 2014

Implications to time-lapse seismic are discussed when relying on 2D deghosting and redatuming techniques rather than on 3D algorithms to match deep-tow data with a shallow legacy seismic tow. The analysis at hand, being performed for the first time, not only uses quantitative metrics to allow for a thorough and detailed evaluation of the 4D noise observed, but also capitalizes on new qualitative measures like the stack of the horizontal acceleration component Y for its characterization. The analysis on 2D deghosted and redatumed deep-tow data is performed against a measured shallow-tow witness data set where care was taken not to compromise the 3D propagating wavefield in the pre-processing. Whereas the 2D approach produces good repeatability over laterally non-varying geology, it fails over more complex geology, introducing a coherent error when dealing with out-of-plane energy. Mitigation is available through the use of 3D deghosting and redatuming algorithms, relying on non-aliased spatial bandwidth to further enhance time-lapse repeatability.

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