Study Of The Converted Wave Pre-stack Depth Migration Based On Split-step Fourier

In the wave equation theory support and with the development of the computer, the keyseismic migration has also changed, from poststack migration to the prestack migration,andtime offset to depth migration. Wave equation prestack depth migration is one of theimportant techniques in seismic migration, it is put forward to solve the imaging of complexgeological structure and severe lateral velocity variation region, which can not only adapt thelateral velocity variations,but also can improve the imaging accuracy in complex geologicalarea, providing the important material basis for the interpretation and underground energyexploration.Based on wave equation prestack migration theory of P-P wave exploration is commonlyused in seismic exploration, but in the face of fracture of P-P wave exploration is verydifficult to predict the direction of fracture and other relevant information, and P-SV hasshear wave information,which can be used in fracture prediction, and complete the work thatconventional treatment can not. Visibly, P-P wave and P-SV wave migration plays anindispensable role in seismic migration, at the same time, comparing the P-SV waveprocessing results and theoretical model, it can also ensure the reliability of interpretationwork in promoting the development of the P-SV wave migration.This paper introduces the seismic exploration for the national economic contribution, andthe wave equation migration technique is an important method of seismic exploration, so asto highlight the purpose and significance of the research, then introduces the research statusabout migration and converted wave of migration at home and abroad; the wave equationmigration of continuation and imaging theory has been described in this paper, and severalpre stack depth migration methods are discussed, focused on the introduction of adaptive splitstep fourier shift algorithm lateral velocity,establish a theoretical model and processit,proving the correctness of wave equation migration theory again and verifying theadaptability of split fourier operator, which shows the imaging precision of the method is notonly efficient, and with high computational efficiency, but also occupying less computingresources etc… Finally,some characteristics of converted wave profile are found in converted wave migration section,and put forward some problems and the research direction in thefuture.