Multiple attenuation is one of the biggest challenges in the seismic signal processing workflow in the Campos Basin. This is a consequence of the seafloor depth variability and the presence of several reservoir target levels, in both pre-salt and post-salt zones. In this scenario, strong multiples interfering with the primaries prevent creating a good reservoir image. In ocean-bottom seismic (OBS) acquisition, sources are near the surface while the receivers are deployed at the seafloor, giving two different datum in the process. This dual-datum poses a problem to using surface-related multiple elimination (SRME) techniques directly on the OBS data alone. To overcome this, the traces necessary to perform SRME on the OBS data are obtained from towed-streamer data in the same area. Another effective demultiple technique is based on the source-side wavefield propagation of the water layer to model the related multiples as described by Kostov et al. (2015) with the generalized deterministic water-layer demultiple. Here, we show a case study in the Campos Basin, offshore Brazil, where towed-streamer data complements ocean-bottom cable data to generate a 3D SRME multiple model and then is combined with a water-layer wavefield propagation model to produce improved multiple attenuation from shallow to deep water. We look at the models and its adaptive subtraction results.
Presentation Date: Tuesday, October 13, 2020
Session Start Time: 9:20 AM
Presentation Time: 9:20 AM
Location: Poster Station 13
Presentation Type: Poster
