A three-dimensional earthquake anisotropic medium reverse-time migration imaging method and device

Abstract

The invention provides a three-dimensional earthquake anisotropic medium reverse-time migration imaging method and device, and is applied to the reflected wave earthquake data processing technology field. The method includes: determining the need for reverse-time migration imaging of all gun (S11);for each gun, performing the following processing steps (speed 12): in the corresponding shot gun position placed wavelet, and the application of coupled second order partial differential equation of the gun shot wave field simulation (S121);through application of corresponding the cannons data described in the coupling of the second order partial differential equation, the cannon is geophone wave field simulation (S122);mentioned in application of cross-correlation imaging conditions on the shotpoint wave field simulation and the result of the detection point of wave field simulation results described imaging, get the single shot reverse-time migration results (S123); and performing after the above processing steps, all bulbs are all single shot reverse-time migration results add up to form the reverse-time migration imaging section ( / S13).The invention adopts the stable coupling of the second order partial differential equation to realize difference to solve wave equation, can solve the TTI medium symmetric axis Angle calculation instability problems caused by the mutation, and ultimately solve the rapid changes in speed of 3 d complex structure imaging

Description

technical field [0001] The invention relates to the technical field of reflected wave seismic data processing, in particular to a method and device for reverse time migration imaging of three-dimensional seismic anisotropic media. Background technique [0002] The seismic anisotropy of the earth's medium has been proved to be universal, but seismic exploration often regards the earth as an isotropic medium. In the past, this kind of approximation could simplify the problems and formulas of seismic processing and interpretation, but in the pursuit of fine reservoir exploration today, some seismic media (such as thin interbedded sandstone reservoir media, layered shale media, carbonate reservoir media, etc.) are ignored. The anisotropy of the fracture-cave reservoir medium in the rock and the igneous rock reservoir medium with fractures) may cause large errors in seismic processing and interpretation, and one of the errors in seismic data processing is biased. Misalignment pr...

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Problems solved by technology

[0004] The main purpose of the embodiments of the present invention is to provide a three-dimensional seismic anisotropic medium reverse time migration imaging method and device to solve the sudden change in the symmetry axis dip parameter profile when performing shot point wave field simulation in the prior art There is a problem with calculation instability

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