Low Signal-noise Ratio Of Seismic Data Analysis Monitoring

The low SNR region is often surface, underground double complex area, surface elevation changes, fracture, old strata, and the surface lateral variation; complex subsurface structures, thrust nappe structure. The seismic data with low signal-to-noise ratio of seismic data imaging difficult. For a long time, the original records of seismic exploration has been at the scene by the artificial analysis and evaluation, this evaluation method is through the eyes of people in earthquake monitoring and recording observations, with the aid of seismic processing the single shot record, stack section, judgment of the first qualified to time, energy, frequency, noise and record auxiliary channel or not, the conclusion of the evaluation result record. Analysis using this method is mostly qualitative, and the evaluation of personnel experience and technical levels are different, which may bias the evaluation results. Especially in the low SNR region, the final results of seismic data evaluating seismic data for qualityis not accurate. And the original data are affected by the static correction and noise, looks very low signal-to-noise ratio, the conventional evaluation may be rated unsatisfactory record single shot, can still be very good completed geological task after treatment. So the monitoring of conventional analytical techniques cannot be applied to the low SNR region. At the same time as the complex subsurface structure and non surface consistent statics in the presence of the stack section velocity modeling difficulties, affecting the accuracy of evaluation.According to the low SNR region monitoring these problems mentioned above, firstly mathematical principle of monitoring methods currently used are analyzed, based on the common source point, the specific method of the common receiver point and center point monitoring field acquisition quality, effective evaluation on the field construction quality. And the field observation property inspection system is studied, ensuring the accuracy of field observation system properties. At the same time of low SNR field processing technology was studied, through the wavelet consistent processing technique of static correction, time-varying static correction technique and constrained velocity modeling technology stack monitoring technology with technology,piedmont, explore a set of suitable low SNR monitoring analysis technology, a good solution to the specific area monitoring difficult the problem of low signal-to-noise. Finally, the method proposed in this paper respectively in Tiankou, LiuPanshan, Paishijing, Tahe of Xinjiang middle area of the practical application, the application of various monitoring means, can be seen in the surface region of this method can control the quality of field data is not very good, and finally ensure the field construction for.