Full waveform joint inversion method for improving high steep structure velocity inversion efficiency
A technology of full waveform inversion and velocity inversion, which is applied in the field of petroleum geophysical exploration and can solve the problem of large amount of calculation of full waveform inversion.
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[0080] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0081] Flowchart of a full-waveform joint inversion method using prism wave information to improve the efficiency of velocity inversion for high and steep structures (such as figure 1 shown), including the following steps:
[0082] Input initial velocity field, shot record and source wavelet, and establish observation system;
[0083] Use traditional reverse time migration to obtain imaging results, use reverse time migration imaging results as the reflection coefficient model, apply linear forward modeling and linear wave field backpropagation;
[0084] Calculate the gradient directions of the two prism waves prism1 and prism2, and add the gradients of these two parts to obtain the gradient direction of the prism waveform inversion. Use the linear search method or parabolic fitting method to obtain the update step size, and use the obtained G...
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