Abstract：At present, the correlation wavelet of the commonly used vibroseis sweep signal has many large sidelobes, which produces strong correlation noise, especially in the area with a low signal-to-noise (S/N) ratio in the west, and thereby affects the quality of seismic data seriously. Ricker wavelet is an ideal wavelet with small sidelobes and strong resolution. However, most of its energy is concentrated in the main frequency band, which leads to few low-frequency components and a narrow frequency band. As a result, Ricker wavelet fails to meet the requirements of broadband exploration. To solve the problem, this paper proposes a damped Ricker wavelet featuring small sidelobes, rich low frequency and broadband and defines its calculation formula. Then, the damped Ricker wavelet is used to design a broadband nonlinear sweep signal of vibroseis. With the characteristics of broadband and small sidelobes, the sweep signal is utilized to perform forward simulation. The application test shows that this method can improve the vibroseis exploration effect and the quality of seismic data.
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