Rayleigh wave waveform inversion imaging method
A waveform and inversion technology, applied in the field of Rayleigh wave waveform inversion imaging, can solve the problems of poor lateral resolution of shear wave velocity inversion and wrong inversion results.
Pending Publication Date: 2022-07-05
CHANGAN UNIV
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[0005] Aiming at the above-mentioned deficiencies in the prior art, a Rayleigh wave waveform inversion imaging method provided by the present invention solves the phenomenon that the conventional multi-channel surface wave analysis technology misjudges the lateral velocity change as the vertical velocity change, resulting in Wrong inversion results, poor lateral resolution of inversion of shear wave velocity
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[0078] The specific embodiments of the present invention are described below to facilitate those skilled in the art to understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes Such changes are obvious within the spirit and scope of the present invention as defined and determined by the appended claims, and all inventions and creations utilizing the inventive concept are within the scope of protection.
[0079] like figure 1 As shown, the present invention provides a Rayleigh wave waveform inversion imaging method, and its implementation method is as follows:
[0080] S1. Collect field seismic surface wave data;
[0081] In this embodiment, the acquisition of the field seismic surface wave data is the same as the acquisition of the ordinary reflection seismic exploration data acquisition process, which is not repeated here.
[0082] In t...
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The invention discloses a Rayleigh wave waveform inversion imaging method, and belongs to the technical field of shallow shear wave velocity structure imaging, and the method comprises the steps: collecting field seismic surface wave data; preprocessing the single shot data, and extracting a surface wave frequency dispersion curve of the first shot data according to a multi-channel surface wave analysis method; determining the change range of the underground shear wave velocity of the measurement area according to the shear wave velocity of the surface wave dispersion curve with the high-frequency limit approaching to the surface layer of the medium and the shear wave velocity of the surface wave dispersion curve with the low-frequency limit approaching to the bottommost layer of the medium, and determining an initial model with the increasing velocity according to the change range; and inputting the initial model, carrying out Rayleigh wave waveform inversion to obtain a transverse wave velocity structure, and completing inversion imaging of the Rayleigh wave waveform. According to the method, the problems of wrong inversion results and poor transverse resolution capability of the inversion transverse wave velocity caused by the phenomenon that the transverse velocity change is misjudged as the vertical velocity change in the conventional multi-surface wave analysis technology are solved.
Description
technical field [0001] The invention belongs to the technical field of shallow shear wave velocity structure imaging, in particular to a Rayleigh wave waveform inversion imaging method. Background technique [0002] In the wave field generated by earthquake excitation, the energy of Rayleigh wave accounts for 67% of the total energy of the wave field, and the observation data with higher signal-to-noise ratio can be obtained during data acquisition. On the other hand, the data processing process of Rayleigh wave is simple, Directly, the obtained shear wave velocity profiles have higher resolution. Although the conventional Multi-channel Analysis of Surface Waves (MASW) has been widely used, the forward modeling of its dispersion curve is based on the assumption of a horizontal layered medium, so the multi-channel surface wave analysis technology is only suitable for A horizontal layered model and an Earth model with a gradual change in transverse S-wave velocity. When the ...
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IPC IPC(8): G01V1/30
CPCG01V1/303
Inventor 邵广周吴华李庆春
Owner CHANGAN UNIV