Seepage medium seismic shear wave numerical simulation and imaging method

Abstract

The invention belongs to the technical field of multi-dimensional imaging, and discloses a seepage medium seismic shear wave numerical simulation and imaging method, which comprises the following steps: expanding an initial model to a frequency-space domain through Fourier transform according to an explosion reflection cross section principle; performing wave field continuation in the depth interval by using multiple groups of reference parameters to obtain multiple groups of wave field continuation results; according to the relation between multiple groups of reference parameters and actual parameters in the geologic model, obtaining a final wave field continuation result through an interpolation equation; executing frequency and depth operation, and completing wave field continuation operation of the whole two-dimensional profile; and performing inverse Fourier transform on the frequency domain wave field to obtain a seismic record. Through adoption of the improved wave field continuation method, seismic transverse wave field continuation of a non-uniform medium is realized, and a new effective multi-physical-quantity and multi-parameter-model seismic transverse wave numerical simulation and migration imaging method suitable for a seepage medium is developed; and the fluid-containing reservoir is predicted through seismic transverse wave field forward modeling and inversion imaging, and exploration and development schemes can be correctly deployed.

Description

technical field [0001] The invention belongs to the technical field of multi-dimensional imaging, and in particular relates to a seismic shear wave numerical simulation and imaging method of a seepage medium. Background technique [0002] At present, in actual seismic exploration, when seismic waves propagate in fluid-bearing formations, the seismic waves will induce the interaction between the fluid and the framework to cause energy attenuation, among which the attenuation of the longitudinal waves is the strongest, while the shear waves propagate in the rock framework, so The attenuation received is not strong. Therefore, when the compressional wave propagates in the fluid-bearing formation, it will be subject to relatively strong attenuation and phase delay, which cannot describe the internal structure of the reservoir well, while the shear wave can describe the internal structure of the reservoir well. Therefore, using S-wave seismic data to predict fluid-bearing reservo...

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Problems solved by technology

[0006] (1) Seismic P-wave is subject to energy attenuation, waveform and spectrum distortion in fluid-bearing formations, and cannot accurately describe the internal structure of fluid-bearing formations, while S-waves can better describe the internal structure of reservoirs. The current forward modeling and migration imaging methods for S-waves less research

[0007] (2) The existing multi-physics and multi-parameter differential equations describing the propagation of seismic waves in fluid-bearing formations are very complex, and the equations contain many physical fields and parameters, which makes it difficult to solve the equations and complex calculations, and it is very difficult to perform multi-dimensional seismic wave field imaging. Difficult, only attribute analysis can be carried out on it, which is seriously out of touch with the 2D and 3D data commonly used in actual seismic exploration

Therefore, the multi-physics and multi-parameter differential equation describing the propagation of seismic waves in fluid-bearing formations is very complicated. The equation contains many physical fields and many parameters, which makes it difficult to solve the equation and the calculation is complicated. Moreover, the current forward modeling and migration imaging methods for shear waves There are few studies, and multi-dimensional seismic shear wave imaging is very difficult, and it is difficult to be effectively applied in practice

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