Q Tomographic Inversion And Application Based On Source Spectrum Consistency Criterion

The quality factor Q is an important parameter in seismic data processing.On the one hand,the Q value is used for formation absorption compensation to improve the resolution of seismic data.An accurate estimate is important.However,the commonly used Q estimation methods have problems such as poor noise resistance and weak stability.For this reason,a source spectrum consistent Q tomographic inversion method is proposed.This method is based on the theory of seismic wave propagation in viscoelastic media.The equation propagates the seismic signals received at different times back to a certain position along the ray path,constructs the inversion equation based on the consistency of the spectral characteristics after the back propagation,and then uses the particle swarm algorithm to solve the objective function to avoid the problem in the objective function.the local extremum problem.Compared with the traditional Q estimation method based on a single attribute of the spectrum,this method inverts the Q factor based on the consistency of the overall characteristics of the seismic spectrum,and does not require known source information,and the inversion results are more stable than the traditional method.The model test shows the effectiveness and stability of the method.On the basis of method research and model trial calculation,the method in this paper has been practically applied in the investigation of the near-surface absorption structure and the inversion of the underground absorption structure in Jidong Oilfield Capability of thin layer structures.