海洋地震勘探中空气枪震源激发特性研究

The signatures of seismic wavelet excited by air guns in marine seismic survey

1. 中国石化胜利石油管理局地球物理勘探开发公司,山东东营 257100;2. 中国石化胜利油田勘探监理部,山东东营 257000

Geophysical Exploration and Development Company, Shengli Petroleum Administration, Dongying 257100, China

在海洋地震勘探中,空气枪是其主要震源。研究了空气枪震源的工作原理及其子波测试方法,并利用Zi-olkowski模型实现了空气枪震源的近场和远场子波信号模拟,分析了不同空气枪沉放深度的能量和初泡比。同时,以套筒式空气枪为例,从能量大小、初泡比、频率等方面对空气枪信号子波特性进行了分析。

Air gun has replaced blasting explosive to be the main seismic source. This paper discusses the operational principle of air gun and the method to test the signals that excited by air gun, simulates the near- and far-field signatures by using Ziolkowski model, and describes the energy and P/B ratio at various shot depths. Sleeve air gun is taken as an example to study the signatures of seismic wavelet excited by air guns in terms of energy, P/B ratio and frequency.