Shallow Water 3D MWD - a Case Study from West Africa

Goss, L. T.; Wang, P.; Meng, Zhaobo; Chazalnoel, Nicolas; Ting, Chu-Ong; Sahai, S. K.; Meng, X.; Maguire, Dan; Knapp, Steve

doi:10.3997/2214-4609.20130514

Cited by 3 publications

References 3 publications

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Closed-loop surface-related multiple estimation with full-wavefield migration-reconstructed near offsets for shallow water

Zhang

Verschuur

2021

GEOPHYSICS

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Reliably separating primary and multiple reflections in a shallow water environment (i.e., 50 m to 200 m water depth) still remains a challenge. The success of previously published closed-loop surface-related multiple estimation (CL-SRME) depends heavily on the data coverage, i.e., the near-offset reconstruction. Therefore, we propose the integrated framework of CL-SRME and full-wavefield migration (FWM). Multiples recorded in the data are capable of helping infill the acquisition imprint of the FWM image. With this image as a strong constraint, we are able to reconstruct the data at near-offsets, which is essential for better primary and multiple estimation during CL-SRME. FWM applied in a non-linear way can avoid the negative influences from the missing data, and at the same time bring in more physics between primaries and multiples. The FWM image of the top part of the subsurface is also used to back-project the information from multiples to primaries with the physical constraint of all this information belongs to the same earth model, provided that a good description of the source wavefield and a reasonable velocity model are available. The proposed integrated framework first reconstructs near-offsets via the closed-loop imaging process of FWM and then feeds the complete reconstructed data to CL-SRME for better primary and multiple estimation. A good performance is demonstrated on both 2D synthetic and field data examples in a challenging shallow water environment.

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Closed-loop surface-related multiple estimation with full-wavefield migration-reconstructed near offsets for shallow water

Zhang

Verschuur

2021

GEOPHYSICS

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4D acquisition and processing of streamer and OBC data in West Africa: A case history to demonstrate how survey planning and advanced processing techniques improve repeatability for reservoir monitoring

Knapp

Maguire

Meng

et al. 2014

SEG Technical Program Expanded Abstracts 2014

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Improving shallow water MWD: Offshore Canada case study

Chang

Luo

Shu

et al. 2015

SEG Technical Program Expanded Abstracts 2015

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Data from towed streamer surveys in shallow water environments are usually contaminated by different orders of sea floor reflections called water-layer-related multiples (WLRMs). The model-based water-layer demultiple (MWD) method effectively removes WLRMs. The initial development of 2D MWD was followed by a 3D implementation to better handle out-of-plane WLRMs. This 3D implementation was further improved by using a selective-input strategy to handle the inconsistency of the high-frequency multiple patterns between adjacent sail lines and shots. Time-variant aperture scheme is proposed based on multiple contribution gathers (MCGs) to include sufficient large apertures, avoid aliasing problems, and compensate for apex shifting. Using narrow azimuth towed streamer (NATS) data from the Hibernia field, we demonstrate the benefit of selective-input MWD with timevariant apertures for attenuating WLRMs in shallow water data.

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Shallow Water 3D MWD - a Case Study from West Africa

Cited by 3 publications

References 3 publications

Closed-loop surface-related multiple estimation with full-wavefield migration-reconstructed near offsets for shallow water

Closed-loop surface-related multiple estimation with full-wavefield migration-reconstructed near offsets for shallow water

4D acquisition and processing of streamer and OBC data in West Africa: A case history to demonstrate how survey planning and advanced processing techniques improve repeatability for reservoir monitoring

Improving shallow water MWD: Offshore Canada case study

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