Prediction method for velocity wavelet response of vibroseis

Abstract

The invention relates to a vibroseis speed wavelet response prediction method, and belongs to the technical field of vibroseis design. The near-surface medium attribute parameters are determined based on the acceleration signals obtained in the construction process of the vibroseis, starting from a high-order response system formed by the vibroseis and the near-surface medium, through the calculated near-surface physical property parameters, the prediction of the seismic velocity wavelet response excited by the vibroseis under different near-surface physical property conditions is realized, and the prediction accuracy of the seismic velocity wavelet response is improved. Data support is provided for design and optimization of scanning signals under different near-surface physical property conditions, establishment of the optimal adaptation relation between the scanning signals and the surface of a work area is facilitated, and seismic data quality is improved.

Description

technical field [0001] The invention relates to a method for predicting the velocity wavelet response of a vibrator, and belongs to the technical field of vibrator design. Background technique [0002] Vibroseis is a green, safe, efficient, and controllable seismic exploration equipment, and has gradually become one of the main excitation sources for seismic exploration. Before the vibrator works, the body of the vibrator must first be lifted by the lifting cylinder, so that all the weight of the vibrator acts on the vibrator plate, so as to ensure the close coupling between the vibrator plate and the ground. During the working process, the high-pressure hydraulic oil generated by the vibrator vibrator hydraulic system alternately enters the upper and lower chambers of the weight to push the weight to move up and down. At the same time, the hydraulic pressure generated by the hydraulic oil is transmitted through the piston rod, the upper plate and the column structure. To t...

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Problems solved by technology

In 2019, Huang Zhiqiang et al. established a three-dimensional rough earth surface topography based on the classification theory, constructed a vibrator plate-earth contact model, and studied the surface morphology and material parameters on the contact force-deformation curve between the vibrator plate and the earth. According to the influence law of the vibrator plate-earth contact model, the vibration response and energy transfer of different vibrator plate-ground contact models are calculated. The research shows that both the surface topography and material parameters of the ground will lead to the nonlinear contact between the vibrator plate and the ground, and affect the vibrator plate-earth contact model. Vibration Response and Energy Transfer of Earth Contact System

Although the calculation method of near-surface physical parameters has been proposed, and the influence of the ground surface topography and material parameters on the contact force-deformation curve between the vibrator plate and the ground has been studied, there is a lack of different near-surface elastic coefficients and damping coefficients. The quantitative simulation of the amplitude-frequency and phase-frequency characteristics of the vibrator characteristic signal under certain conditions cannot directly guide the design of the vibrator scanning signal

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