The Research Of Noise Attenuation Technique For Liaohe Peripheral Luxi Depression Area Seismic Data

In many areas of the seismic data, due to the impact of complex surface andgeological conditions, there are various kinds of interference wave, seriously affectingthe imaging quality of seismic data. In seismic data processing must adopt effectivemeans to suppress and attenuate a variety of interference, improved thesignal-to-noise ratio.In this paper，takes the latest acquisition seismic data of bao32well in Liaoheperiphery Luxi Depression area as research materials, Combined theactual production while learning domestic and foreign advanced technology.Thorough analysis the original seismic data by a full range of analysis，there is anexception road, anomaly amplitude noise, environmental noise, resonance interference,strong surface waves and acoustic interference and so on. In view of theexisting various interference, maximum protection the significant wave by targetedprestack noise attenuation techniques of multiple domain and Multi methodcombination iteration, focusing on the application of3D cross cone filtering,abnormal amplitude attenuation technology,3D prestack random noise attenuationand so on. To improving the signal-to-noise ratio. At the same time，We takenmany reasonable and effective integrated techniques，for example：static correctionmethod、amplitude compensation method、well constraining processing method、prestack time migration method and so on. The final processing results ofgeological phenomena plentiful，fault and breakpoint is very clear. The characteristicsof Igneous rock and lateral variation of deposition very clearly. Thespecial rock clear reflection and good agreement with well data.3D cross cone filtering technique developed in recent years and has overcomethe shortcomings of the2D filtering technology, transform the3D recording systeminto a cross-spread gathers by using a cross cone filtering. The Nonlinear surfacewaves on the gun set is converted into linear interference, and through the filter toeliminate it. Through the application of this method, The Attenuation of surfacewave effect is very good. The surface wave has been well attenuatedwithout hurting the effective signal.The basic idea of prestack random noise attenuation is to statistic theF-X domain multi shot. The effective wave is predictable, but the randomnoise without this feature, we use the least square principle to get prediction operator and applied to the prestack seismic data. So as to attenuating the random noise,contributed to improve the quality of velocity spectrum and the velocity field ismore accurate. To ensure optimum stacking and migration imaging of the seismicdata. Through the application of this method, the signal-to-noise ratio is improvedmarkedly. The Velocity trend obviously and the quality of velocity spectrum isgreatly improved.According to the characteristic of noise in suvey, the thesis researched detailyand established a suitable noise attenuate technology and processing flow for thiscomplicated structure area of low signal-to-noise ratio.