The Marine VHR 2.5-D Seismic Brute Stack Cube as a Feasible Tool for Low Budget Investigation and Research |
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| Authors: | Christof Müller |
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| Institution: | (1) Institute of Geosciences, Department of Geophysics, Kiel University, Otto-Hahn-Platz 1, D-24118 Kiel, Germany |
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| Abstract: | Between 1997 and 1999 several marine seismic surveys were carried out in Kiel Bay aimed towards the development of a three-dimensional
acquisition and interpretation technique for small scale subsurface structures using high-frequency sources and multichannel
streamers. The data set was recently revisited by the author and reprocessed to obtain a multichannel stacked seismic data
cube. Nominal hydrophone positions are deduced by determining offsets from first arrival times and estimating the hydrophone
positions under consideration of the ships track. Processing towards a ‘seismic cube’ mainly comprised CMP sorting, constant
velocity NMO correction and stacking. The resulting VHR 3-D seismic ‘brute stack cube’ reveals rich structural details. The
fluvial Pleistocene channel system already documented in an earlier publication was tracked further to the north. It is situated
below a flat cover of gas-bearing Holocene sediments, which locally constitute the seafloor. This till-horizon is superimposed
on a second till layer showing strong topographic variations. Seismic signal phase and shielding effects indicate the possible
presence of gas in these formations. This case history demonstrates that the VHR 3-D seismic method is a feasible tool for
low budget investigation and research. |
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| Keywords: | Baltic Sea gas' Holocene marine 3-D seismics multichannel Boomer seismics very high resolution (VHR) |
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