Pre-stack Time Migration Processing Of 3D Seismic Data Of Heidimiao Oil Layer In Pu A Well Area

Pre-stack time migration technology is a seismic data processing technology developed gradually with the development of seismic exploration technology and electronic computer technology in the late last century.Among the geophysical methods of petroleum industry exploration,seismic exploration technology has become the most effective one.Seismic exploration is to use artificial source to stimulate seismic wave and set geophone to receive seismic data,and then deduce the shape and characteristics of underground geological structure.Taking seismic data processing in well area of Pu A in the north of Songliao Basin as an example,check the existing problems and limitations of the old processing data,the main characteristics and difficulties of seismic data in this area are studied and analyzed,and the main process and main difficulties to be faced are determined.Combined with the basic geological conditions of the region and the characteristics and quality of the observation system of original seismic data acquisition,this paper uses the high-level static correction and refraction wave static correction to eliminate the influence of the surface elevation and the lowspeed reduction zone of the surface in the study area,which can basically solve the static correction problem in the research area.Then,the noise and effective signal in the seismic data are used to eliminate various noise interference in the order of energy first strong and weak,frequency first low and high,speed first low and high,and taking into account the protection of effective signals.The seismic wavelet is compressed by combining prediction deconvolution with consistent deconvolution on the surface,which can broaden the seismic frequency and improve the resolution of the earthquake.In the migration processing stage,we use the anisotropic pre-stack time migration technology based on VTI media to eliminate the influence of the anisotropy on the imaging accuracy,and improve the imaging accuracy.The results of pre-stack time migration obtained by the above processing process are moderate signal-to-noise ratio,high resolution,natural waveform,obvious wave group characteristics,rich inter layer information,clear and reliable breakpoints and sections.