TN652 : Ground roll attenuation in reflection seismic data using variational mode decomposition
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2016
Authors:
Mehrdad Khalil Tahmasebi [Author], Amin Roshandel Kahoo[Supervisor], Ali Nejati Kalateh[Supervisor]
Abstarct: Seismic imaging is highly dependent on the quality of seismic data. Structural and stratum interpretation of seismic sections that contain the least amount of noise is much easier. Coherent noise is major categories of noise that associated with seismic data. Coherent noise has a same trend from one seismic trace to another trace Ground roll is one of the main coherent noises which have a low frequency high amplitude and low velocity. There are many methods to undermine the rolling noises are provided, each with their own advantages and disadvantages. In this thesis, the variational mode decomposition (VMD) with using the time-frequency map has been used for undermine ground roll noise. In this method, traces containing noise with using VMD decomposed to variation modes and filtering in time frequency map. In continuing, to improve the results of VMD and time-time transform mode is used. In continuing, to improve the results of VMD and time-time transform mode is used that in this method, traces containing noise transmission to domain Time-Time and undermine with using 2D filter and VMD. Both methods were applied on synthetic and real seismic data and results of two methods compared with to gether and also this metods comparing with comon method f-k. The results showed that the VMD method and time-time transform have beter performance than first method. Also each both methods have best performance in comparing with f-k method without damaging to reflection traces.
Keywords:
#Seismic Reflection #Ground rolling Noise #Variational Mode Decomposition #Instrict Mode Function #Time-Frequency Map #Time – Time Tansform Link
Keeping place: Central Library of Shahrood University
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