Abstract：The 3-D seismic exploration in north sea area of Beizao coalfield(belongs to Bohai sea)is the first 3-D high-precision seismic exploration aimec at offshore coalfield in China. The exploration area is 6.44?,the water depths of work area are between 0~12m,the depth of target is 809m. The geologic structural trends in work area are not consistence. There are developed faults. The goal of the exploration is to clarify the relief of faults anc folds in relief of 3~5m in coalfield. Therefore，we put emphasis to use 3 measures:① optimizing thedesign of geometry;②reasonably choosing thedepth of air-guns and their array pattern;③ guaranteeing the correctly positioning of geophones.The gained high-precision seismic sections after using abovementioned measures are characteristics of evident events feature,good continuity and high S/N ratio in major targets. The errors of depth are nogreater than 4m,that can basically clarify the relief of faults and folds above 5m.
