
%0 Journal Article
%A Widmaier, Martin 
%A Hegna, Stian 
%A Smit, Frans 
%A Tijdens, Erik 
%T A Strategy for Optimal Marine 4D Acquisition
%J ASEG Extended Abstracts
%D 2004/03/01
%V 2004
%N 1
%P 1-4
%K 
%R https://doi.org/10.1071/ASEG2004AB157
%U https://www.publish.csiro.au/paper/ASEG2004AB157 
%X Repeating source-receiver azimuths can be an important aspect of 4D acquisition. Seismic repeatability will decrease with an increase of source-receiver azimuth differences between base and monitor surveys. This paper discusses a marine acquisition strategy with respect to the optimal preservation of source-receiver azimuths in the presence of feathering. We show that repeating shot positions is favorable for azimuth preservation in 4D acquisition in combination with overlap configurations (additional outer streamers). With a dense streamer separation, source-receiver azimuths can be repeated very accurately by using this strategy. In a base survey, overlap configurations allow the vessel to follow the survey?s pre-plot sail lines with significantly reduced crossline deviations. A well-conditioned base survey simplifies and optimizes the repetition of vessel/source positions in a future monitor survey. 
