Optimization And Application Of Seismic Lighting Technology Of Different Geological Models To The Observation System

How to optimize the design of the observation system become the primary precondition for seismic data acquisition.Lighting analysis which is mainly divided into two categories:ray tracing method and wave equation method is an effective and reliable means for studying the wave field characteristics of seismic wave propagation.The wave equation method can provide the kinematic characteristics and the dynamic parameters of the wave in the medium when the wave is propagated,but the simulation process is complicated and the application range is narrow.Ray tracing illumination shows the propagation of seismic waves in the form of rays.It has the advantage of conciseness,image and convenience,and it can reflect the propagation path of seismic waves simply and clearly.It mainly reflects the distribution of underground reflection points,and it can study the distribution rules,migration rules and the number of target layers.Seismic lighting needs based on the geological model,this study is divided into complex geological model of strata,strata,syncline,anticline,dip normal faults and reverse faults in the basic elements,supplemented by horizontal strata as compared to seismic illumination model analysis,the distribution law of the reflection of the objective layer.The results show:(1)In the tilting model,the ray reflection point moves updip direction,we can use the way of moving down the direction of the shot and excite reception of midpoint asymmetrical.In the upward direction,we should enlarge the receiving arrangement and increase the reflection point density of the upward dip section.(2)In the syncline model,the ray reflection point moves to the two wings,the reflection point of the nucleus is sparse or even missing,and the shot points are added in the favorable excitation region,which can improve the lighting energy of the target area.(3)In the anticline model,the ray reflection point moves to the core,and the range of the reflected waves is smaller on the wings.We can use the updip downdip shooting receiving way to improve the coverage effect of reflection point.(4)In the normal fault model,the fault plane is similar to the tilted layer,and the energy mainly comes from the shot point in the downward direction,and the energy contribution of the tilting direction of the fault is less.(5)In the reverse fault model,the information of the footwall is easily missing.The alignment length of observation system should be increased,and the shot point need to be increased in the corresponding location.On the basis of lighting analysis for basic geological models,This paper is based on the research and analysis of the mining which is a fold development area in Hami,Xinjiang.This research puts forward the method of optimizing the observation system,improves the quality of seismic exploration data,achieves good results,and has some reference for other complex geological conditions.