Solving Water Column Statics with Seismic Oceanography

Bright, David S.; Jones, Craig; Selvage, J.I.

doi:10.3997/2214-4609.201412959

Cited by 2 publications

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“…For streamer data, a number of methods have been already formulated, ranging from straightforward static corrections (WOMBELL, 1996) and NMO adjustments of traveltimes (LACOMBE et al, 2009), to more detailed characterizations obtained from reflections occurring in the water column (BRIGHT et al, 2015). These reflection events are related to impedance contrasts produced by termohaline variations of the water properties, which in turn allows detailed visualization of some oceanic processes (HOLBROOK et al, 2003;SONG et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

The structure of water-layer sensitivity kernels in OBN-type acquisition geometries

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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The water column is usually taken as an homogeneous velocity layer in OBN-type marine seismic surveys. Heterogeneities caused by salinity and temperature variations, however, may introduce significant artifacts resulting in inaccurate interpretation of sub-sea floor geologic features, especially accounting the long time spans of seismic acquisitions that take place in ultra-deep ocean environments. Here we investigate the underlying structure of sensitivity kernels in this horizontally distributed acquisition geometry, mostly focused on the development of improved water layer velocity reconstructions from bottom node data. Two possible formulations are here considered, relating first arrivals with velocity perturbations, where a reference oceanic state and some overall shape/pattern of the velocity perturbations could be known a priori. The results are expected to provide guidelines for adapted inversion schemes, directed to more detailed water layer velocity reconstruction.

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Section: Introductionmentioning

confidence: 99%

The structure of water-layer sensitivity kernels in OBN-type acquisition geometries

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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“…Nonetheless, it is clear that most of the main developments on this matter were carried on by oceanographers, who saw potential on the increased horizontal resolution (compared to traditional oceanographic techniques) to explore water mass boundaries, eddies, internal waves, and thermohaline fine structure among many other oceanic phenomena. The application of Seismic Oceanography to solve water column statics was already proposed (BRIGHT et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

On the application of Fermat's interferometric principle for water-layer velocity reconstruction in OBN data

2021

Proceeding of the 17th International Congress of the Brazilian Geophysical

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Knowledge of sea water velocity variations is an important issue for subsurface seismic imaging, particularly in 3D and 4D surveys where reservoir variations must be distinguished from those related to spatio-temporal water variations. A very promisingly and highly-resolved alternative to classical water velocity corrections involves the processing of small amplitude reflections observed within the water layer, during typical marine acquisitions with streamers. In this study we investigate the possibility that these very same reflections could be sensed by Ocean Bottom Nodes (OBN), thus helping the development of more detailed water velocity reconstruction for the transmitted arrivals. For that, first we conduct synthetic simulations to obtain the propagated acoustic field, enforcing our focus on its down-going components. Once such water reflections (now transmitted down to OBN location) are identified in the generated responses, some form of Fermat's interferometric redatum can be applied. It is found that such information might be helpful on the development of more detailed water velocity corrections departed strictly from their underlying signature on the transmitted arrivals.

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Solving Water Column Statics with Seismic Oceanography

Cited by 2 publications

References 0 publications

The structure of water-layer sensitivity kernels in OBN-type acquisition geometries

The structure of water-layer sensitivity kernels in OBN-type acquisition geometries

On the application of Fermat's interferometric principle for water-layer velocity reconstruction in OBN data

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