Research On Inversion Of Seawater Temperature And Salinity Profile Based On Post-stack Method

During the past marine seismic exploration,people’s purpose is to find resources such as submarine oil,natural gas,understand geological structure and characteristics,and in the process of dealing with marine seismic exploration data,it is removed as noise.Since 2003 Holbrook Posted in the article in "Science",the results of the reflection data in the seawater layer can be reversed in the water salt thin structure of the sea water.This study enables earthquake ocean to go to the historical stage,which has gradually become a new means of studying seawater physical properties.Compared with traditional contact measurement technology,the seismic ocean method is based on seawater temperature salt fine structure technology has high smooth resolution,rapid imaging in a short period of time.Previous research scholars are based on seismic exploration data for inversion research.The seismic exploration data is processed and cannot be fully guaranteed to remove noise interference.Based on the inversion results of seismic exploration data,the error cannot be accurately determined is from the noise of the unstoppable noise in seismic exploration data or during the inversion algorithm.The research work of the former people did not study this problem.In order to explore the source of inversion errors in the inversion algorithm,this study is inverse the warm salt thinning of seawater on the basis of ideal seismic synthesis records.This research analyzed the principles and advantages and disadvantages of the main methods in the seismic inversion.According to this special physical properties of the exploration medium,the recursion inversion method in the stack inversion is selected.First,select the temperature salt and then analyze the product as the initial data and analyzes the temperature and salt fine structure of the location where the research line is located.Synthetic seismic records based on folding model are being evolved.Through the Rayleigh criteria,analyze the resolution of the synthetic seismic record,analyze the quality impact of the vertical interpolation initial data on the synthetic seismic record.Based on the above analysis,ideal synthesis seismic records are obtained.Secondly,based on a 6-channel temperature salt data in the initial data,the speed and density of the correcting calculation is used as logging materials,and the restriction is performed.After analysis,sub-wave frequency,sound velocity,and density logging materials,the seawater partition position in the predimentary salt process will generate errors in the inversion of the temperature and salt fine structure.The main frequency of the sub-wave is influential to the inversion accuracy,mainly produced in the sub-structure of the seawater.The fitting relationship of sound speed and density logging data will affect the inversion accuracy on the entire seismic tract.During the relationship between the fitting of the warm salt,the seawater partition position will generate an error on the inversion of salinity.Finally,through the seismic reverse performance of the temperature salt thin structure,it can clearly indicate the structure in the study area seawater.Through the temperature salt thin structure of the initial data,the three cases of temperature salt thin structure obtained by the horizontal interpolated logging materials are compared,and further demonstrates the three cases of temperature and salt thin structures obtained by horizontal interpolation log materials based on a small amount of logging data.The seismic oceanography has the advantages of high horizontal resolution and strong continuity.