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The Research And Application Of Reverse-time Pre-stack Depth Migration In The QT Area Of JiangSu

Posted on:2012-09-02Degree:MasterType:Thesis
Country:ChinaCandidate:Y Y JiaoFull Text:PDF
GTID:2120330335951025Subject:Earth Exploration and Information Technology
Abstract/Summary:PDF Full Text Request
In recent years.The pre-stack depth migration as the effective method has been paied attention more and more for resolving the complex imaging. With the development of prospection and exploitation in land.the difficulty of it is becoming biger and biger.The requests of The complex seismic processing for the imaging is improving. The production indicates that the post-stack and the pre-stack time migration can not product accurate image of the reflect for high accuracy and the description of resvoir stratum.but the pre-stack reverse depth has the substitute function. In this paper, the application of pre-stack reverse depth migration in practice data and velocity methods were studied.Kirchhoff integral migration based on the radial theory is applied widly in the production. The advantages of it as follow:the higher efficiency in computation.the flexible target oriented imaging, the capability suitable to big angle and the seismicdata of irregular survey. All of that make it to be an indispensable kind of migration way. Also the method of velocity analysis matching it has growed up. compare to the advantages of it. Low precision of imaging, the aliasing phenomenon, amplitude infidelity and multi-arrivals of travel-time are fatal limitation of it.Comparing with Kirchhoff. The wave equation pre-stack depth migration don't consider the amplitude and the travel time and achieved by the continuation of wave field. has attached importance because of the high precision and embodying the dynamic characteristics of seismic wave field. The efficiency is improving along with the appearance of GPU, and the application of the wave equation pre-stack depth migration is more productively.Moreover. it has possessed important function for post-stack lithology inversion and pre-stack AVA and indicates the trend of imaging techniques.Velocity is the core of wave pre-stack depth migration, while migration is the tool for velocity accuracy. it is uniform process between them. In this paper, considering the velocity analysis capability of Kirchhoff and the higher precision imaging results of wave pre-stack depth migration. they are both applied in the practical seismic processing.Velocity model was built by high precision analysis regard of anisotropic through Kirchhoff intefral.Migration,and then the method of reverse depth migration was applied to the QT seismic data. The result indicates that the reverse migration is an effcitive method of seismic imaging and has prospect development.
Keywords/Search Tags:Kirchhoff integral, migration based on wave equation, reverse migration, velocity model, anisotropic
PDF Full Text Request
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