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Oil and Gas Resource Survey Technology and Its Application in the Northern Waters of the South China Sea——Seismic Wavelet Detection and Simulation Analysis
Author(s): 
Pages: 98-104
Year: Issue:  2
Journal: Journal of Ocean Technology

Keyword:  near-field waveletfar-field waveletwavelet simulationmain pulsebubble period;
Abstract: It is necessary to obtain real-time far-field wavelet of air gun arrays in field acquisition and deterministic wavelet deconvolution indoors. Starting from the method of source wavelet detection, this paper expounds the process of near-field wavelet acquisition, amplitude conversion and recording, and lists the problems that need to be considered and addressed when measuring near-field wavelet. Then it introduces the acquisition methods and the main ways of source far-field wavelet, together with the actual measurement scheme of source near-field wavelet and far-field wavelet, as well as the instruments and acquisition techniques needed to detect source wavelet. The bubble interference of air gun wavelet, the relationship between virtual reflection and subsequent bubble oscillation, and the influence of absorption attenuation on the wavelet are analyzed,respectinely. According to the measured far-field wavelet, the simulation results of Qi’s and Fan’s gas models are compared. The results show that the simulated wavelet of Fan’s gas model is more consistent with the actual wavelet. The simulated waveform, amplitude and bubble period of air gun are in good agreement with the simulation results of the industry’s universal Nucleus software, and will continue to be optimized in future applications.
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