Research On Seismic Acquisition Technology Of OBC Wide Azimuth

A part of the three dimensional block,which has been explored in the Bohai Bay Basin,is complicated by the underground structure,and is limited by the acquisition technology and equipment conditions at that time.The signal to noise ratio of the data is low,and the expected geological task can not be reached well,which restricts the further development of the oil field.It is necessary to study and implement new acquisition methods for target blocks.Wide azimuth seismic exploration can carry out omni-directional observation,increase acquisition lighting degree,obtain more complete seismic wave field,enhance the ability to recognize fault,crack,lithology and fluid,and have higher steep angle imaging ability and abundant amplitude imaging information,and wide azimuth earthquake is also beneficial to pressure.The near surface scattering interference is used to improve the SNR,resolution and fidelity of seismic data.Based on production practice,a OBC wide azimuth small distance observation system is designed and successfully applied to target area acquisition.Further improvement of marine air gun source excitation technology,geophone coupling technology,double detection ghost wave technology,high density data underwater transmission technology at sea,and two positioning technology of cable placement and geophone.A complete set of seismic acquisition technology,which is suitable for offshore shallow weak reflection area,complex fault block,Qianshan insider and lithologic trap imaging,has been formed.It is very important for reserves discovery in complex structural area of Bohai oilfield.