Research On Structure-Oriented Noise Suppression

Due to the influence of sensors,acquisition methods,and external interference,seismic data often contain various noises.Seismic data with high signal-to-noise ratio is usually necessary in practice,so the research of seismic data denoising theory is always the focus of seismic data processing.In the research field of noise suppression,geophysical researchers have also designed various denoising methods,and obtained relatively good results.Due to the needs of practical applications,conventional denoising methods can no longer meet the actual needs,and the limitations of traditional denoising methods are gradually revealed.Nowadays,how to better balance noise suppression and structural protection is the key to data processing.The trend of the seismic event axis reflects the information of the stratigraphic interface,and the dip angle attribute of the seismic data plays an important role in the processing and interpretation of the seismic data.In addition to filtering according to the direction of time and space,seismic data processing can also be filtered according to the seismic structure.In this paper,the seismic wave event axis dip angle attribute is used to characterize the structural orientation of seismic data.The traditional inclination estimation algorithm is highly sensitive to noise.How to strengthen the noise resistance of the algorithm is the key research direction.In this paper,the conventional inclination estimation algorithm is improved,and on the basis of the improved inclination estimation algorithm,the directional filtering is constructed.In this study,based on the local dip angle attribute of the seismic wave event,two types of structural steerable filtering are performed on the seismic data.One is to use an improved dip angle estimation algorithm to perform structural steered filtering on the seismic data through dip angle constraints;Differential equations,build diffusion equations for diffusion filtering of seismic data.The structure-guided filtering method uses the dip angle constraint of seismic data to complete the filtering processing of seismic data,which can better suppress random noise and protect structures such as faults.Through the improved inclination angle estimation algorithm,this paper uses the inclination angle information to invert the reflection coefficient,and obtains the high-resolution reflection coefficient,which ensures the lateral continuity.