Design method of vibrator sweep signal for customized high-resolution wavelet

Due to the advancements of seismic data acquisition and imaging with "wide band, wide azimuth, and high density", thin layers, small-scale (fractured-vuggy) anomalous bodies, and small-throw faults (strike-slip faults), etc. have become the main target geological bodies for high-fidelity and high-resolution imaging. In current seismic exploration, reasonable observation system design has received sufficient attention, but how to achieve customized high-resolution wavelets for the customers is rarely discussed. In theory, vibroseis is a method of obtaining the amplitude spectrum of expected seismic wavelet through the accumulation of single-frequency energy within time intervals in the frequency and time domain. Based on this, we propose the concept of customized high-resolution seismic wavelets and corresponding sweep signals for the customers. The first step is to generate (or customize) a zero-phase wavelet, which meets the requirements of high-fidelity and high-resolution on a specific target layer, and obtain its corresponding amplitude spectrum. The second step is to establish the mapping relationship between the amplitude spectrum of the customized wavelet and the vibrator sweep signals. Finally, the vibrator sweep signals are designed under the assumption of linear sweep frequency. We use formula derivation and model tests to demonstrate the feasibility of our method. Forward modeling and migration tests also show that the customized high-resolution wavelet could be used in high-resolution processing.