Research On 3D Seismic Data Depthimaging

With the development of our country land exploration,the difficulty of exploration and development is gradually increased.The seismic data processing is becoming more and more difficult,while the precision of seismic data interpretation of seismic data processing requirements also more and more high.Post-stack migration and prestack time migration is difficult to meet the needs of high precision structure imaging and reservoir description.The prestack depth migration is more and more attention.This paper mainly study the three dimensional seismic data prestack migration data preparation,modeling speed and prestack reverse-time migration method.Kichhoff integral method of prestack depth migration with high computational efficiency and the ability to adapt to the steep dip angle formation is applied widely in industrial production.The reason why it has such an important position in the production because its high computational efficiency and adaptability and its relatively perfect matching of migration velocity analysis method.But it has certain disadvantages,such as poor prone to false frequency and amplitude fidelity and imaging accuracy is not high and multipath problem.Compared with Kichhoff prestack depth migration,the calculation process of RTM by wave field continuation.Regardless of the traveltime and amplitude,high precision of imaging and fidelity amplitude is good,and it can get very good keep seismic wave dynamics characteristics.With the progress of the GPU technology,the large amount of calculation problem is solved with higher and higher degree of industrialization.Therefore,based on wave equation prestack depth migration technology has become the development direction of pre-stack migration technique in the future.Velocity model is the core of the prestack depth migration,and migration is the inspection method,so the relationship between inseparable.This paper combines the actual conditions of subei district characteristics of seismic data based on predecessors' research,summarizes adapted to this research area of prestack depth migration method.In view of the characteristics of seismic data,this paper used Omega,Marvel processing system,through the multiple attribute consistency processing,relative amplitude and fidelity fine processing,high precision velocity analysis,high resolution,high accuracy of prestack imaging processing technology,to improve the precision of seismic imaging.We has obtained the wave group characteristics of clear,fault position accurate,high resolution,high quality 3d seismic geological phenomenon obvious achievements,Dainan formation overlap pinchout point clear,clear mound three sections inside reflection wave group.For the study of the whole district of sedimentary facies belt and lithological distribution and the regularity of hydrocarbon accumulation,tectonic fine description,sand body and reservoir prediction,looking for favorable facies belt and concealment trap study provides reliable basic data.