Analysis Of Influences Of Dual-sensor Seismic Acquisition System And True Amplitude Migration

The seismic exploration technique,mainly based on reflected wave,aims at studying the underground geological structure and inversing the formation of lithology parameters.Migration is one of the key techniques in seismic data processing,and Wave Equation Pre-stack Depth Migration provides an accurate method for complex geological structure imaging.However,withthe increasing demand for oil and gas,and the increasing difficulty of oil and gas exploration,the traditional explore method cannot match the more and more difficult situations.The accuracy of exploration plays a more and more important role in seismic exploration.Once migration processing only focused on the accuracy of structure,but recently people have paid more attention to the accuracy of true amplitude of the interface.That is to say,people begin to focus on not only the shape and position of the underground structure,but also concerning about the change of lithology;people begin not only using kinematic information in seismic reflection data,but also using the dynamic information of seismic data.For Pre-stack Depth Migration,most of depth migration is based on extrapolation of one way wave equation.Yet,it has congenitally deficient for reflection interface estimation,which is significant for the inversion of AVO amplitude.Therefore,this paper uses a method which relies on full-wave equation depth migration method using up and down detectors.This method can accurately solve the wave equation and provide more accurate reflection interface dynamics information.This paper is based on true amplitude migration algorithm of dual detector seismic data acquisition system and a set of double true amplitude migration method(Jiachun You,2015).Furthermore,I test the method in unideal situations to see the stability and reliability of the algorithm,namely,'Robustness'.In actual production,the error of seismic data is inevitable and has many sources.For example,during the acquisition process,there may be the inconsistency between detectors because of the inherent error,random noise during acquisition.During the process,there may be model error speed.Plus,underground structure itself has different effects on reflection seismic wave energy,and the diffraction cannot completely offset by migration.At the same time,the tolerance and sensitivity of different geological structures varies from one to one.The purpose of this paper is to provide a reliable theoretical basis for practical application of the dual detector spectral projection algorithm,and to provide ideas for further researches.