Three-dimensional transmission time interval (TTI) earthquake anisotropic medium reverse time migration imaging method and device

Abstract

The invention provides a three-dimensional transmission time interval (TTI) earthquake anisotropic medium reverse time migration imaging method and a device, and is applicable to the technical field of reflected wave earthquake data processing. The method comprises the steps of: determining all guns required to be subject to reverse time migration imaging; executing the following steps for each gun: placing a wavelet at a position corresponding to the gun, and using a coupling second-order partial differential equation to simulate a shot point wave field; performing the coupling second-order partial differential equation on gun data corresponding to the gun, and simulating a detection point wave field; and according to a cross-correlation imaging condition, a shot point wave field simulation result and a detection point wave field simulation result, imaging to obtain a single-gun reverse time migration result. By adopting the differential solution of wave equation by suing the stable coupling second-order partial differential equation, a problem of unstable time caused by mutation of a dip angle of a symmetrical axis by using a TTI medium is solved, and a defect of the three-dimensional complex-structure imaging with greatly changed speed can be overcome.

Description

technical field [0001] The invention relates to the technical field of reflection wave seismic data processing, in particular to a three-dimensional TTI seismic anisotropic medium reverse time migration imaging method and device. 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 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 produced by the posterior fault. There...

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Problems solved by technology

[0005] The main purpose of the embodiment of the present invention is to provide a three-dimensional TTI seismic anisotropic medium reverse time migration imaging method and device to solve the sudden change in the profile of the symmetry axis inclination angle parameter in the prior art when the wave field simulation of the shot point is performed There is a problem with the calculation instability of the position

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