Coherent noise attenuation using Radon techniques.

摘要

Developing methods to eliminate coherent noise from seismic data is continually a subject of interest in seismic exploration. This thesis focuses on application, implementation and development of various Radon techniques to remove ground roll and multiple reflections.; The definition and classification of the Radon transform (RT) are studied. Hybrid RT is implemented in time domain and applied for ground roll attenuation. The problem is solved as an inverse problem using an iterative reweighted least squares conjugate gradient algorithm (IRLS). Sparseness constraints are introduced via Cauchy regularization norms and a right preconditioning technique is preferred to increase the computational efficiency. Synthetic and real data examples are used to illustrate the performance of hybrid Radon for ground roll attenuation.; A shifted hyperbola is adopted as a basis function for the RT to improve the approximation of the reflection events at long offsets. The shifted hyperbolic RT is applied for velocity analysis and estimation.