Abstract
Dynamic response of the seismic sensor is crucial, particularly for ultra-weak vibration detection. The related researches almost focus on traditional electrical ones. However, for fiber-optic seismic sensor (FOSS), the dynamic response, as well as the on-site results, is rarely reported. This study thoroughly evaluates the theoretical mechanism for improving the dynamic response of FOSS and its applications in the oilfield. The Ricker wavelet is utilized to simulate the applied seismic signal, and its dynamic response output is investigated. The influences of peak frequency and damping ratio on resonance wave suppression and correlation coefficient improvement are discussed. Besides, the perforation shot detection based on ten-level 3-component FOSS arrays is demonstrated in the oilfield. The basic FOSSs and damping-optimized FOSSs are both manufactured for dynamic response comparison. The signal features, including attenuation time, correlation coefficient, and principal frequency component distribution, all confirm the dynamic response improvement of the proposed damping-optimized FOSS array.
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