Seismic Data Processing Method And Application In T1 Area Of Daqing Oilfield

At present,Daqing oilfield has entered the stage of high maturity exploration.,the old exploration area represented by area T1,despite the high degree of exploration,the exploration potential is still enormous,but its early seismic data processing results are affected by many factors such as acquisition and processing technology,which can not meet today's fine oil and gas exploration needs.Therefore,in order to achieve the current exploration target,we need to break through the bottleneck of the original seismic data,and using high fidelity,high signal-to-noise ratio and high resolution seismic data processing method to reprocess seismic data in the study area is an effective way to improve the quality of seismic data.This paper takes the T1 area as an example to study and solve the technical difficulties and methods faced in the re-precision of high-precision seismic data processing in the T1 region.The paper first summarizes the research status of high-precision seismic data processing technology at home and abroad.Then comprehensively research and analyze the original data collection,static correction,signal-to-noise ratio,interference wave and energy in the T1 research area,and fully understand its existing problems and difficulties.Based on the understanding of the study area,the key technologies of high-precision seismic data processing are studied.Finally,combined with the example of T1 area,the practical application effect of high-precision seismic data is analyzed.Based on the research of static correction method and the actual data of T1 area,a combined static correction method is proposed to solve the practical static correction problem in T1 area,which can eliminate the influence of static correction in the study area;New amplitude-preserving noise suppression techniques,such as 3D conical filtering and coherent noise attenuation with non-uniform spatial sampling,are used to remove the interference wave in the study area and improve the signal-to-noise ratio of raw data;The improved two-step surface consistent deconvolution method is used to deal with the inconsistency of seismic wavelet waveforms and frequencies caused by excitation and reception conditions in T1 area.It eliminates the virtual reflection caused by shot points and geophone points,effectively widens the frequency band,and fidelity improves the resolution of data;Using interactive velocity analysis,multiple iterations to establish an accurate velocity model;Kirchhoff integration prestack time migration is selected,migration aperture and anti-aliasing factor are selected to achieve high resolution imaging of the study area.The final results are accurate structure,active waveform,good formation characteristics,high signal-to-noise ratio,moderate resolution,and brittle breakpoints,which are conducive to further fine oil and gas exploration.The results of the thesis can not only further promote the deeper exploration in the next step of the T1 area,but also have a positive reference and guidance for the seismic data processing of the same type in China.