Research On Static Correction And Denoising Technique For Seismic Exploration In The South Edge Of Junggar

The mountainous area and the piedmont belt in the southern margin of the Junggar Basin are versatile in lithology and complex in structure.The surface velocity and thickness vary greatly in vertical and horizontal directions.Various noises develop and the signal-to-noise ratio is very low.It is difficult to see effective in the pre-stack gathers.Reflection,so the static correction and denoising processing in the area is extremely challenging.The predecessors have done research and work in many aspects in the Junggar area,and have achieved certain results,but with the continuous development and deepening of technology and exploration requirements,some treatment methods and ideas are no longer applicable.Therefore,it is necessary for us to further study the data processing of the area.Based on the theoretical basis and various methods of static correction and denoising,combined with the seismic data processing practice in the piedmont belt in the southern margin of the Junggar Basin,this paper first analyzes the characteristics of seismic data in this area according to the requirements of seismic data processing.Then focus on the two aspects of static correction and denoising.In the aspect of static correction processing,a variety of static correction methods are compared and analyzed for the measurement area data,including datum static correction,tomographic static correction,refraction wave first arrival static correction,and reflected wave first arrival static correction.The correcting method finally selects a suitable static correction method and combination method.The processing results show that the effect of a single static correction technology is not obvious,and must be combined with a variety of static correction techniques;in the aspect of denoising,follow the multi-domain joint noise mode,and based on the LIFT denoising idea for prestack noise.Interference suppression.The specific scheme is to first suppress the abnormal noise and lowfrequency surface wave interference by applying the abnormal amplitude attenuation method and the spectral ratio method in the gun field.Then,in order to eliminate the large amount of linear interference existing in the seismic data to the maximum extent,we perform the surface consistency amplitude prediction of the seismic data.Compensation processing,then transform the seismic data into the cross-domain,and use the f-xy predictive filtering technique to suppress the strong energy interference of the near-point based on the LIFT noise-noise concept,and then pass the 3D FKK cone filtering technique to a large number of The linear interference is filtered out;finally,the inverse ground consistency compensation process is performed.Applying the above technical ideas to the seismic data of the southern margin of the Weier,the static correction and noise interference of the seismic data are well treated.The signal-to-noise ratio and resolution of the final data have also been effectively improved,which has certain reference value for the data processing in the future.