Broadband Seismic Data Processing Research And Application In South Yellow Sea

Study in this paper derives from production,and depends on offshore high precision seismic exploration technology,which is the crucial technology of 12 th Five-Year plan.Improving seismic data quality in intermediate and deep water,as research purpose,is a pressing problem in practical production.The study of this thesis provides not only reliable geophysical data for ‘Formation Conditions and Exploration Technologies of Large and Medium Offshore Oil and Gas Fields',but also detailed basic data for ‘Key Technologies of Oil and Gas Exploration in Deep Water Area'.Geologists set a higher request to geophysical data with the development of oil field exploration,so we need seismic data with broader band in order to further characterize production conditions of oil field accurately.Low frequency information in seismic data determines the outlines and types of oil field,while high frequency information divides the detailed stratification of oil group and the exact boundary of the oilwater,thereby further enhancing oil recovery and oilfield life.Therefore,the broadband of seismic data requires not only high frequency but also low frequency protection.Broadband acquisition currently has two main development directions.One is double detection acquisition(Geostreamer)method developed by PGS,this method suppresses ghosts by different responses on water and land geophone,which is installed in the same position on the cable to broaden the frequency spectrum.The other broadband acquisition(Broad Seis)method developed by CGG Veritas acquires a series of seismic data of trapped wave with cable settled at different depths,eliminating effects of ghost wave with post processing to broaden the frequency bandwidth.Nevertheless,the two companies sell technology services rather than processing software.Therefore,the acquisition and processing markets have also been occupied by these foreign companies.With the further demand for broadband data in exploration,the monopoly of acquisition and processing technology will seriously restrict the further development of the geophysical market.The purpose of this paper is to use the resources of the Geophysical Exploration Department to develop the acquisition and processing technology of broadband seismic data,achieving the goals of both acquisition and processing,and laying the foundation for future market development.