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将气枪直接插入到淤泥中激发是提高产生地震波效率的有效措施,这种方法已在浅水湖泊地带的地震勘探中得到应用。本文给出了一个描述这种激发过程的物理模型,得到了远场压缩波形的计算式。分析表明,用这种方式所激发的远场地震波是一个衰减的正弦波,其振幅、周期及时间衰减因子除与气枪气室的容积和气压有关外,更多的是依赖于淤泥的力学性质。高压气球用于对淤泥作机械功的极限效率约为28％。
The direct insertion of an air gun into silt is an effective measure to increase the efficiency of producing seismic waves. This method has been applied to seismic exploration in shallow lakes. In this paper, a physical model describing the excitation process is given, and the calculation formula of the far-field compression waveform is obtained. The analysis shows that the far-field seismic wave excited in this way is an attenuated sine wave. The amplitude, period and time attenuation factor depend on the mechanical properties of the mud . The ultimate efficiency of high pressure balloon for mechanical work on silt is about 28%.