Integration of continuous seismic profiling in geotechnical investigations off the Belgian coast
Henriet, J.-P.; Bastin, A.; De Rouck, J. (1978). Integration of continuous seismic profiling in geotechnical investigations off the Belgian coast, in: KVIV 7de Internationaal Havenkongres. pp. 18/1-18/13
In: (1978). KVIV 7de Internationaal Havenkongres. KVIV: Antwerpen, more
Continuous seismic profiling using boomer, sparker or pinger sources has gained widespread use in marine site investigations. At a reconnaissance stage, a grid of continuous seismic traverses with adequate orientation and mesh size is able to yield a coherent picture of the structural conditions of subsurface, allowing the definition of areas of main prospective interest. In the early stages of detailed site investigations, seismic profiling forms an efficient tool for the planning of high-cost offshore drilling and penetration testing programs. Keys to success in seismic data acquisition are a matter of careful balancing and matching of source/receiver parameters with the marine and geological environment and with the geotechnical penetration/resolution requirements. In many cases, sea state conditions are critical. Seismic work is mostly rewarding when used in multiple attack-mode, in conjunction with other exploration efforts. It provides the lateral exploration power which point investigations like boreholes lack. On the other hand, borehole data, seabed coring and penetration testing provide the necessary clues for identification of observed seismic events and for raising any ambiguity, inherent in the seismic method. The vertical time dimension of seismic profiles can be converted into depth by suitable borehole control and seismic velocity models, compiled from refraction data and well shooting. A comprehensive geotechnical survey for the offshore extension of Zeebrugge harbour illustrates some possibilities and limitations of seismic profiling in Belgian offshore areas and proves a striking example of its successful integration in geotechnical investigations.
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