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Application of Curved-ray Traveltime Computation Method in Kirchhoff Prestack Time Migration

WANG Xiao-wei1,2,YAO Yao1,LV Bin2,CHENG Qing1,2(1.China University of Geosciences,Wuhan 430074,China;2.Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China)  
With the progress of seismic exploration and the development of computer technology,prestack time migration has been widely used,and obtains good effect in many exploration areas.Traveltime computation is the most important step in Kirchhoff integral method prestack time migration,which is used most extensively in prestack time migration methods to process seismic data.But the conventional traveltime computation method cannot resolve the complexity of the under ground structures.Here the authors introduce the curved-ray traveltime computation method based on the interval velocity model,and compare the Kirchhoff curved-ray prestack time migration with the conventional Kirchhoff prestack time migration by processing the salt-dome model and real seismic data using the two methods.Compare with the conventional Kirchhoff prestack time migration,Kirchhoff curved-ray prestack time migration has the advantages not only the high computational efficiency and strong adaptability,but also the good imaging in complex under ground structures.
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