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针对高速玄武岩屏蔽层下深层成像困难的实际问题,采用波动方程波场数值模拟技术,根据玄武岩地层的特点,设计三个相应的简单高速玄武岩模型,通过对深层反射地震信号能量的分析,说明了低频地震信号既具有较强的穿透薄高速玄武岩屏蔽层的能力,也具有减弱因粗糙表面所产生的绕射噪音的能力。一个完整的2D玄武岩模型的模拟试验证明了利用低频信号可以提高高速玄武岩屏蔽层下深层成像的质量,实际资料的低通滤波处理也取得了预期的效果。
Aiming at the practical problem of deep imaging difficulty in high-speed basalt shield, three corresponding simple high-speed basalt models are designed according to the characteristics of basalt stratum using wave equation wavefield numerical simulation technology. By analyzing the energy of deep reflection seismic signal, Low-frequency seismic signals not only have strong ability to penetrate thin high-speed basalt shield, but also have the ability to attenuate the diffraction noise caused by the rough surface. A complete 2D basalt model simulation test proves that the use of low-frequency signals can improve the quality of deep-layer imaging under high-speed basalt shields. The actual data of the low-pass filter processing also achieved the expected results.