Abstract
The nature of seismic scattering was investigated by elastic scattering
theory and numerical experiment. Seismic scattering situations can
be classified by analyzing the amplitude versus scattering angle
behavior of the scattered seismic wave field. The shape of large
objects has significant impact on the dynamics of the scattered wave
field. Gather oriented as well as prestack methods capable of enhancing
the scattering response and assisting in classification were developed.
A new 3D migration technique based on diffraction stack migration
was introduced. The method uses either coherency (DCM) or polarization
(DPM) information to enhance the image of scatterers. Multichannel
seismic surveying using boomer sources was tested, as a first step
towards a high resolution 3D marine seismic acquisition technique.
A 2.5D seismic survey was conducted in northern Kiel Bay. A Pleistocene
fluvial channel system was revealed beneath the sea floor. DCM efficiently
enhanced the image of marine scatterers. Crustal VSP data was acquired
within the scope of the DSI program which is aimed towards detecting
massive volcanogenic ore deposits in the crystalline crust. DCM and
DPM were applied to VSP data acquired in Matagami, Canada. DPM reduced
imaging ambiguity and a scattering center in vicinity to the orebody
was found. DCM was also applied to a VSP data set acquired at the
Sudbury impact structure, Canada. Correlation with regional geology
is aggravated by the imaging ambiguity imprint on the migration result.
urn:nbn:de:gbv:8-diss-3845
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