Optimization and application of seismic acquisition geometry for complex geological targets
The optimization design of geometry is an important means to improve the quality of seismic data and reduce the acquisition cost.Improving the reflected energy in the shadow area of the steep slope of complex geo-logical targets is a difficulty in geometry design.Therefore,an optimization method of seismic acquisition geo-metry for complex geological targets was proposed.Firstly,the Fresnel zone radius was used on the three-dimen-sional(3D)model to re-optimize the Gaus-sian beam illumination energy,improve the accuracy of forward mode-ling,and extract the surface element reception energy and reverse illumination energy of each target layer.Se-condly,three methods were used to optimize the geometry according to different geological targets and surface ob-stacles:① Automatic shot densif-ying based on the uniformity of surface element reception energy of the target layer.②Shot densifying range optimization based on the reverse illumination energy of the target layer.③Shot optimization based on the dual constraints of surface obstacle range and energy uniformity of the target layer.This method has been applied in the northern blocks BS and G94 of the Shengli exploration area,effectively improving the imaging accuracy of seismic data.
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