| 考虑多种因素影响的海上地震勘探气枪震源单枪子波数值模拟 |
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| 引用本文： | 李国发,曹明强,陈浩林,倪成洲.考虑多种因素影响的海上地震勘探气枪震源单枪子波数值模拟[J].应用地球物理,2010,7(2):158-165. |
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| 作者姓名： | 李国发 曹明强 陈浩林 倪成洲 |
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| 作者单位： | |
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| 摘 要： | 在分析Ziolkowski气泡振动模型局限性的基础上,建立了多种实际因素影响下的海上地震勘探单枪子波模型。此模型考虑了气泡壁的热传导作用、枪口节流作用、气泡上浮、液体粘度和枪体本身等对气枪子波的影响。相对于Ziolkowski模型,改进模型所模拟的气枪子波主峰值减小,气泡振动衰减加快,与实测子波吻合性较好。实验分析表明：（1）枪口节流作用控制着气枪脉冲峰值振幅的大小,（2）上浮过程中气泡周围静水压力值减小,气泡振动的周期随之改变,（3）热传导作用和流体粘度是引起气泡振动衰减的主要因素。
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| 关 键 词： | 热传导 枪口节流 液体粘度 海上勘探 气枪子波 |
Modeling air gun signatures in marine seismic exploration considering multiple physical factors |
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| Guo-Fa Li,Ming-Qiang Cao,Hao-Lin Chen,Cheng-Zhou Ni.Modeling air gun signatures in marine seismic exploration considering multiple physical factors[J].Applied Geophysics,2010,7(2):158-165. |
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| Authors: | Guo-Fa Li Ming-Qiang Cao Hao-Lin Chen Cheng-Zhou Ni |
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| Institution: | (2) Earthquake Research Institute, University of Tokyo, Tokyo, Japan;(3) Tohoku University, Sendai, Japan; |
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| Abstract: | Based on analyzing the limit of Ziolkowski’s bubble oscillation formulation, a new model with various physical factors is
established to simulate air gun signatures for marine seismic exploration. The practical effects of physical factors, such
as heat transfer across the bubble wall, air gun port throttling, vertical rise of the bubble, fluid viscosity, and the existence
of the air gun body were all taken into account in the new model. Compared with Ziolkowski’s model, the signatures simulated
by the new model, with small peak amplitude and rapid decay of bubble oscillation, are more consistent with actual signatures.
The experiment analysis indicates: (1) gun port throttling controls the peak amplitude of air gun pulse; (2) since the hydrostatic
pressure decreases when the bubble rises, the bubble oscillation period changes; (3) heat transfer and fluid viscosity are
the main factors that explain the bubble oscillation damping. |
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| Keywords: | heat transfer port throttling fluid viscosity marine exploration air gun signature |
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