Love型槽波物理模拟及对断层的响应研究

Analogue modeling of Love type channel wave and its response to faults

  • 摘要: 槽波地震勘探因为具有分辨率高、能量衰减小的特点,在煤矿井下隐伏致灾体的地球物理勘探中已得到了广泛的应用。但现阶段的槽波探测精度尚无法满足矿山智能化的要求。在提高探测精度方面,已开展了大量数值模拟研究,目前,物理模拟多以二维模型条件下的Rayleigh型槽波模拟为主,Love型槽波研究较少。为了掌握Love型槽波的传播规律,进行了三维槽波物理模拟中的Love型槽波研究。基于Love型槽波的波动及质点振动特征,通过物理模拟平台搭建、地震物理模型设计及制作、固体超声物理模拟,成功观测到了物理模型中的Love型槽波,并且波场频散曲线与理论值符合。同时,研究发现断层前后波场频率成分发生了以Airy相为分界的明显转换,而且过断层后槽波能量几乎全部被衰减。研究结果将为后续定量、精细化槽波地震勘探提供采集、处理及解释等方法技术的理论支撑。

     

    Abstract: Channel wave seismic exploration has been widely used in the exploration of hidden disaster-causing bodies in underground coal mines because of its high resolution and small energy attenuation. However, the accuracy of channel wave seismic exploration at this stage cannot meet the requirements of mine intelligence. In order to improve the detection accuracy, a lot of research has been carried out in numerical simulation. At present, the subject of channel wave analogue modeling is mostly Rayleigh channel wave under the condition of two-dimensional model, and the research of Love channel wave in three-dimensional channel wave analogue modeling is less. In order to master the propagation rule of Love-type channel wave, the analogue modeling of Love type channel wave was carried out. Based on the propagation and particle vibration characteristics of Love type channel wave field, the Love type channel wave in analogue modeling is successfully observed through the construction of analogue modeling platform, the design and manufacture of analogue modeling model, and the solid ultrasonic analogue modeling, and the wave field dispersion curve is consistent with the theoretical value. At the same time, the research and development found that the frequency components of the wave field before and after the fault have undergone a significant conversion with the Airy phase as the boundary, and the channel wave energy is almost completely attenuated after passing through the fault. The research results will provide basic platform support for acquisition, processing and interpretation methods for subsequent quantitative and refined seismic channel exploration.

     

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