Application and Study of Directionally Illuminated Acquisition Technology in the Complex Area of Bohai Oilfield

With the development of oil and gas exploration in Bohai Oilfield,seismic exploration has turned to the small-scale geological targets,such as small faults,small fault blocks and lithologic-formation traps.The imaging acquired by the conventional seismic technology can not meet the requirement of the exploration in the complex structural area.Based on the existing data,the authors established a geological model for resolving the seismic acquisition and imaging problems in the complex area,laid out the specific shot points and receivers around the target structure,conducted the directional illumination analysis of the target area,and designed the geometry that is beneficial to the accurate imaging of the geological target.The orthogonal geometry named 6L8S360R was used in the acquisition of whole area,and with 6L2S240R in some target areas for the locally dense coverage.The results demonstrate that the directionally illuminated acquisition technology can effectively improve the illumination and imaging quality of complex geological target,and reduce the acquisition cost.