| 南海北部海域油气资源调查技术及其应用研究——震源子波检测及模拟分析 |
| Oil and gas resource survey technology and its application in the northern waters of the South China Sea-- Seismic wavelet detection and simulation analysis |
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| 中文关键词: 近场子波 远场子波 子波模拟 主脉冲 气泡周期 |
| 英文关键词:Near-field wavelet far-field wavelet wavelet simulation main pulse bubble period |
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| 中文摘要: |
| 在野外采集中考察气枪的稳定性以及室内进行确定性子波反褶积处理，都要求能够获得气枪阵列的实时远场子波。本文从震源子波检测方法出发，阐述了近场子波采集、幅值转换及记录流程，并列举出实测近场子波时需要考虑解决的问题；接着介绍了震源远场子波的获取方法和主要途径；震源近场子波及远场子波的实测方案，检测震源子波所需的仪器设备和采集技术方法。文中分析了气枪子波的气泡干扰问题，虚反射与后续气泡震荡间的关系以及吸收衰减对子波的影响。根据实测远场子波，对齐氏和范氏两种气体模型进行了模拟效果对比，结果表明：采用范氏气体模型所模拟的子波与实际子波更为吻合，模拟出的气枪的子波波形、振幅大小、气泡周期上，与业界通用的Nucleus软件的模拟结果吻合较好，在后续的使用中将继续优化。 |
| 英文摘要: |
| 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 when measuring near-field wavelet. Then it introduces the acquisition methods and main ways of source far-field wavelet, the actual measurement scheme of source near-field wavelet and far-field wavelet, 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. 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 the future use. |
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