Introduction to this special section: Offshore technology

2020 ◽  
Vol 39 (4) ◽  
pp. 237-237
Author(s):  
Ulrich Zimmer
Keyword(s):  
Cost Effectiveness ◽  
Special Section ◽  
Offshore Technology ◽  
Seismic Acquisition ◽  
Marine Seismic ◽  
Signal Improvement

In this TLE special section on offshore technology, four papers outline advances in marine seismic acquisition and processing. The first paper, by Manin et al., describes the concept, tank trials, and sea trials of the “FreeCable” system, which relies on a fleet of small autonomous vessels to provide stability and flexibility in the positioning of seismic cables. The trials and pilot surveys show promising results with respect to signal improvement, acquisition efficiency, and cost effectiveness.

High-resolution 3D marine seismic acquisition and imaging in shallow waters: Application to shallow fault detection, Beppu-Bay, Japan

2021 ◽  
Author(s):  
Yosuke Teranishi ◽  
Fumitoshi Murakami ◽  
Shinji Kawasaki ◽  
Motonori Higashinaka ◽  
Kei Konno ◽  
...  
Keyword(s):  
High Resolution ◽  
Fault Detection ◽  
Shallow Waters ◽  
Seismic Acquisition ◽  
Marine Seismic

On the reconstruction of the shape of a seismic streamer

Geophysics ◽  
2010 ◽  
Vol 75 (1) ◽  
pp. H1-H6
Author(s):  
Bruno Goutorbe ◽  
Violaine Combier
Keyword(s):  
A Priori ◽  
Synthetic Data ◽  
Seismic Survey ◽  
Random Errors ◽  
Generalized Inversion ◽  
Reconstruction Methods ◽  
Seismic Acquisition ◽  
Marine Seismic ◽  
Gps Devices ◽  
Vessel Reconstruction

In the frame of 3D seismic acquisition, reconstructing the shape of the streamer(s) for each shot is an essential step prior to data processing. Depending on the survey, several kinds of constraints help achieve this purpose: local azimuths given by compasses, absolute positions recorded by global positioning system (GPS) devices, and distances calculated between pairs of acoustic ranging devices. Most reconstruction methods are restricted to work on a particular type of constraint and do not estimate the final uncertainties. The generalized inversion formalism using the least-squares criterion can provide a robust framework to solve such a problem — handling several kinds of constraints together, not requiring an a priori parameterization of the streamer shape, naturally extending to any configuration of streamer(s), and giving rigorous uncertainties. We explicitly derive the equations governing the algorithm corresponding to a marine seismic survey using a single streamer with compasses distributed all along it and GPS devices located on the tail buoy and on the vessel. Reconstruction tests conducted on several synthetic examples show that the algorithm performs well, with a mean error of a few meters in realistic cases. The accuracy logically degrades if higher random errors are added to the synthetic data or if deformations of the streamer occur at a short length scale.

Recent experience with 4D marine seismic acquisition

First Break ◽  
2005 ◽  
Vol 23 (6) ◽  
Author(s):  
M. Widmaier ◽  
A. Long ◽  
B. Danielsen ◽  
S. Hegna
Keyword(s):  
Recent Experience ◽  
Seismic Acquisition ◽  
Marine Seismic

Introduction to this special section: Acquisition and sensing

2019 ◽  
Vol 38 (9) ◽  
pp. 670-670
Author(s):  
Margarita Corzo ◽  
Tim Brice ◽  
Ray Abma
Keyword(s):  
Special Section ◽  
Seismic Survey ◽  
Ocean Bottom ◽  
Total Cost ◽  
Small Boat ◽  
Air Gun ◽  
Seismic Acquisition ◽  
The Cost ◽  
Seismic Images

Seismic acquisition has undergone a revolution over the last few decades. The volume of data acquired has increased exponentially, and the quality of seismic images obtained has improved tremendously. While the total cost of acquiring a seismic survey has increased, the cost per trace has dropped precipitously. Land surveys have evolved from sparse 2D lines acquired with a few dozen receivers to densely sampled 3D multiazimuth surveys. Marine surveys that once may have consisted of a small boat pulling a single cable have evolved to large streamer vessels pulling multiple cables and air-gun arrays and to ocean-bottom detectors that require significant fleets to place the detectors, shoot the sources, and provide support. These surveys collect data that are wide azimuth and typically fairly well sampled.

Introduction to this special section: Offshore technology and applications/OTC

2017 ◽  
Vol 36 (4) ◽  
pp. 296-296
Author(s):  
Ashwani Dev ◽  
Elive Menyoli ◽  
Douglas J. Foster
Keyword(s):  
Special Section ◽  
Offshore Technology
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