Integrated Velocity Modeling Based On Density Imaging

This paper presented a new integrated method for integrated velocitymodeling after discussing the various difficulties of seismic staticscorrection and depth-migration processing of the complex surface andcomplex geologic structure areas. The new method was based on densityinversion imaging and density-velocity relationship. The technical flow ofthe new method was determined and the several key questions in the flowwere discussed. The inversion result of DLK area demonstrated that themethod for integrated velocity modeling based on density imaging waseffective and correct.The paper expanded the golden section algorithm and made it can do2.5D inversion; Several effective measures were presented to solve themultiplicity problem including related coefficient weighted to determinethe initialized value of the griddings; According to the model tests, theaffect of every interelated parameter was summarized and the principlesof choosing suitable parameters were presented; The relationships ofdensity and velocity were summarized and classified; Based on all ofthese, the technical flow of the method for integrated velocity modelingbased on density imaging was presented. The paper also did some studyon a method of statics correction of complex surface which can treat the transverse velocity varies; Finally, according to the whole technical flow,the actual data of DLK area of Xinjiang province were processed. Twovelocity profile models of DLK044 and DLK052 were established. Thedepth migration processing of these two profiles were carried out. Theimproved results of depth migration demonstrated the practicability ofthis new method.