A 3D Seismic Velocity Inversion Method Based on Cone Waves

Abstract

The present application discloses a three-dimensional seismic velocity inversion method based on cone waves. The present invention first uses the reference source point and ray parameters to control the generation of cone waves, and then encodes the 3D seismic data using the cone wave function to obtain a synthetic cone wave super shot record. Conventional 3D plane wave encoding requires two ray parameters, and in this paper The method only needs one ray parameter p, and changes the plane coding into conic surface coding, and can select different reference points for the same ray parameter, so that single-ray parameter inversion can be achieved, and crosstalk noise can be suppressed, so as to achieve inversion The purpose of the velocity field of different scales is to complete the multi-scale inversion by adjusting the angle of p and smoothing, so as to achieve the inversion of the three-dimensional seismic velocity field without low-frequency seismic data, thereby improving the background velocity field of the seismic waveform inversion. Accuracy, so the final velocity field of the inversion is more accurate.

Description

technical field [0001] The invention relates to a three-dimensional seismic velocity inversion method based on cone waves, belonging to the field of oil and gas geophysical prospecting engineering. Background technique [0002] In the current exploration field, the inversion of the 3D seismic velocity field is of great significance for the migration imaging and interpretation of seismic data. The full waveform inversion can make full use of the amplitude, phase, travel time, waveform and other information contained in the seismic data. , to finely characterize the subsurface model parameters. However, full waveform inversion of seismic velocity field waveform inversion has many problems, such as huge amount of calculation, inversion stability, and the need for low-frequency information in seismic data. The data is often extracted and it is difficult to obtain seismic data containing low frequencies, which has caused certain troubles to the velocity inversion of seismic data...

AI Technical Summary

Problems solved by technology

However, full waveform inversion of seismic velocity field waveform inversion has many problems, such as huge amount of calculation, inversion stability, and the need for low-frequency information in seismic data. The data is often extracted and it is difficult to obtain seismic data containing low frequencies, which has caused certain troubles to the velocity inversion of seismic data

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