Meticulously Processing Of Seismic Data About Active Fault Investigation In The Eastern Guanzhong Basin And Comprehensive Research On Seismic Structural Information

China is a country with frequent earthquakes.High-frequency and large-magnitude earthquakes are always a threat to urban residents.It is of great significance to the planning and construction of the city by carrying out seismic fault detection and earthquake risk assessment in large and medium-sized cities.The active fault detection in the eastern section of the Guanzhong basin is shallow.The exploration area is mainly located east of Xi'an.Seismic data have a small trace distance,a short receiving arrangement,and a strong and complex source of interfering wave energy.Seismic data have the characteristics of small track distance,short receiving arrangement,strong and complex source of interference wave,low signal-to-noise ratio and resolution.But fault detection by seismic prospecting require high signal-to-noise ratio and high resolution.combined with geological formations which have be prospected,the seismic data of active fault investigation in the eastern section of the Guanzhong Basin will be processed and explained with accurate and reasonable explanations.This adds difficulty to seismic data processing.The article focuses on the following issues to start a specific study: how to achieve a fine static correction of low SNR data;how to improve the resolution and signal-to-noise ratio of shallow seismic data on the premise of fidelity preservation;how to fine Speed analysis and pick-up to improve interpretation section quality;how to use oil wells or hot well horizon calibrations to identify faults with unequal section sizes and objective existence;how to rationalize fault line structures in the eastern section of the Guanzhong basin based on the final result profile According to the explanation.Aiming at the fine processing technology of seismic data,the principle of static correction is analyzed from a theoretical point of view.The fine refraction static correction method is mainly studied to provide guarantee for subsequent processing;on the actual data of active fault detection,the advantages and disadvantages of different deconvolution methods are,Strive for avoiding weaknesses,choose to design series deconvolution to improve the resolution;the problem of low SNR of seismic data,analyze and understand the overall quality of data,select appropriate suppression methods for different types of noise,and comprehensively compare different treatment methods,select The joint processing of superior modules improves the signal-to-noise ratio;the speed analysis section studies the effects of static correction,signal-to-noise ratio,and velocity analysis parameters,and uses an accurate and reliable high-density velocity analysis method to improve the quality of the overlaid profile.Based on the analysis and comparative study of the treatment process above,a thought and method for the fine processing and interpretation of seismic data with low signal to noise ratio for shallow active faults are obtained.In the actual seismic data of all active faults detected in the eastern section of the Guanzhong Basin,fine processing and interpretation were performed,and the well data was used to calibrate horizons and explain profiles.Based on the known(including inferred)fracture lines in the study area,combined with the interpretation results of each line,the distribution of active faults was further analyzed.