A method for forward modeling of seismic data of a controllable seismic source based on force signals

By employing a forward modeling method based on force signals for controlled-source seismic data, considering the nonlinear vibrator system and coupling effects, and utilizing the acoustic wave equation and absorbing boundary conditions, the problem of controlled-source signal distortion is solved, the simulation accuracy is improved, and near-realistic underground force signals and reception records are generated.

CN122151176APending Publication Date: 2026-06-05CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2024-12-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In existing technologies, the controlled source excitation system is affected by factors such as nonlinearity, plate deflection, and the coupling effect of the weight, plate, and earth, which cause distortion of the force signal transmitted to the underground controlled source. Traditional forward modeling techniques fail to effectively consider harmonic interference, resulting in inconsistencies in frequency, amplitude, and phase.

Method used

By obtaining force signals containing harmonic interference of various orders, the propagation of force signals in the medium is simulated using the acoustic wave equation. Absorption boundary conditions are set, the influence of boundary reflection waves is ignored, and the receiving record is simulated. Finally, controllable source seismic data is obtained by cross-correlation between the force signal and the receiving record.

Benefits of technology

It improves the accuracy of forward modeling of controlled source data, generates more realistic underground force signals and reception records, enhances the simulation accuracy of the excitation and reception ends, and obtains forward modeling results that are closer to real controlled source seismic data.

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Abstract

The application discloses a controllable source seismic data forward simulation method based on force signals, which comprises the following steps: obtaining force signals containing harmonic interference of various orders according to a scanning signal input by a controllable source excitation device; using the force signals as controllable source excitation signals, and simulating propagation of the force signals in a medium; obtaining receiving records obtained at different receiving points due to excitation of the force signals; and simulating controllable source seismic data according to the force signals and the receiving records. The method improves the accuracy of controllable source data forward simulation from two aspects of an excitation end and a receiving end, and can obtain a forward simulation result which is closer to real controllable source seismic data.
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