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Study On Hybrid Radon Transform And Coherent Noise Attuneation Method

Posted on:2012-04-24Degree:MasterType:Thesis
Country:ChinaCandidate:E LuFull Text:PDF
GTID:2120330335493197Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
How to subtract the coherent noise effectively is a long-standing caring problem of the geophysics. This thesis summarizes the characteristics of the coherent noise and the theory of its' common suppressing plan, then we choose the Hybrid Radon transform to suppress it.We circumstantiate the systemic theory of radon transform, and discuss the realization course of it's three basic form (LRT,HRT,PRT) as well as the characteristics, so as to mention and achieve the Hybrid Radon transform. Radon transform is usually achieved by inversion arithmetic for a better result. So we introduce some regularization norms and its' settle means in order to get a better solution. The least square conjugate gradient iterative algorithm is our choice.Radon transform has got good result in noise attenuation, wave field separating and velocity analysis etc. But the conventional multiple suppress using radon transform does NMO on the CMP gathers firstly, then implements the corresponding filtering step, so the final solution's precision is depend on the precision of velocity analysis. In this thesis, we use hybrid radon transform to separate the linear events and the hyperbolic events at one time. In this situation, the linear events such as surface wave have been eliminated entirely, we can apart the multiples meanwhile using adapting removal method after we identify it from the radon field. At present, this technique has crosstalk phenomena in linear field, and needs additional extra terms in the regularization function and more accurate arithmetic for better solution.The disperse calculate of Radon transform brings the truncation effect and the dot phenomena, we use the similar function algorithm to control it. The physical surgery filtering also works for the truncation effect, and the adapting removal method can restrain it. Test results of numerical calculate and actual data demonstrate that radon transform is a effective method for noise attenuation, but the hybrid radon transform has its own merit.
Keywords/Search Tags:Hybrid radon transform, suppressing of surface wave, multiples attenuation, adapting filtering
PDF Full Text Request
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