Optimization method of geometry and application based on Fresnel Gaussian beam forward modeling
The optimization design of geometry based on forward modeling is an important means to improve the quality of field data acquisition and reduce acquisition costs.Based on the conventional Gaussian beam forward simulation theory,the Fresnel band constrained Gaussian beam(Fresnel beam)forward simulation theory is proposed.Compared with the conventional Gaussian beam,the Fresnel Gaussian beam is constrained by the first Fresnel band on its propagation path and has a smaller effective half width,making the travel time and amplitude calculation of the wave field near the central ray more accurate,thus improving the accuracy of forward simulation.At the endpoint of the central ray,extract the received energy of the target layer,establish the energy mean square error and average power analysis functions,quantitatively analyze and evaluate the energy distribution of the target layers under different geometry,predict the later migration imaging effect,and optimize the shot points encryption scheme based on the received energy of the target layer,thus realizing the optimal design of the geometry for complex geological targets.This method has been applied in the G94 northern block of Shengli exploration area,effectively compensating for the energy of illumination shadow areas on steep slope zones and improving the migration imaging effect of data acquisition.
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