海上气枪阵列震源子波数值模拟研究

A numerical simulation of wavelets from offshore air-gun array seismic source

基于海上地震勘探气枪理论模型,开展了单枪、单一子阵列、立体阵列震源子波数值模拟研究。结果表明,单一子阵列可以很好地提高子波主脉冲值,并在压制气泡脉冲方面具有较好的效果;立体阵列可以较好地抑制由于海面虚反射等因素引起的陷波作用,其子波频谱较平面阵列子波频谱光滑。气枪立体阵列组合能够有效地提高子波质量,对其开展更深入的研究与试验具有重要意义。

Based on the air-gun theory model of offshore seismic exploration, a numerical simulation of wavelet was conducted for single air gun, single sub-array and volume array. The simulation results show that the single sub-array can greatly enhance the value of primary pulse and suppress the bubble efficiently. Compared with the plane array, the volume array can more efficiently suppress the notch caused by ghost reflection at sea level, and has more smooth frequency spectra. In addition, the volume array is important to further detailed researches and tests due to its effect to improve wavelet quality.