The Application And Research Of First Breaks In The Complex Surface Area，with The Technique Of Chromatography, Inversion And Statics Correction

In these complex areas, undulating ground and lateral variation in surface structure can distort the propagation path of reflection, cause the distortion of time-distance curve and hence lead to poor image. It will not only can reduce seismic data signal-to-noise ratio,but also to bring many illusions and difficults to explain work, in severe cases can lead to well deployment failure.There are some limitations to solve the surface static problems,with the general static correction methods in the complex surface areas. The technique uses the travel--time informations of first arrivals and Tomography. For the Surface with low velocity of the changing velocity inversion,it avoid the assumption of the conventional static correction layer speed structure,and be suitable for setting up complex near surface speed model. This dissertation researches the technique of chromatography,inversion and statics correction,and studies the principles and application methods of some Tomographic inversion static correction software.Through analyzing the static software in common use, we adopt the advantages of different softwaves to first breaks tomographic inversion static correction, summarize a static correction procedure,which is suitable for different seismic data of complex surface area.It is effective to make the first-break picking up more accurate and improve the quality of the tomographic inversion static correction,through writing the sofeware based on attribute intersection to delete the abnormal first breaks.This technique is applied in areas with complex surface conditions(mountai、loess tableland、gobi、desert). It is useful to solve the static problems in the different complex surface area, improve the seismic section quality. The practice verifies its effectiveness.