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基于随钻地震技术填埋场衬层修补定位检测研究
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摘要
石油或工程钻探中使用的钻头破岩振动噪声通常做为随钻地震技术中的震源,此振动噪声称为钻头信号,以此进行地震勘探,具有实时性强、无下井风险、钻探效率高等特点。本文根据随钻地震技术特点,结合填埋场特殊层状结构,将随钻地震技术应用到填埋场卵石层判断中。主要开展了随钻地震波场特征和不同介质层振动信号时频特征研究;分析钻柱对钻头信号的影响并根据反褶积原理恢复钻头信号;提出小波域多次互相关算法,将其应用于低信噪比数值模拟数据和实际实验数据处理中;提出互相关-小波初至拾取算法,为填埋场近地表波速反演提供基础。数值模拟和实验结果表明本文提出的算法能到达预期效果,结合深入系统的分析其他内容,表明本文研究成果对填埋场卵石层快速判断具有一定的实际意义。
The vibration that are emitted from drill-bit used as seismic wave source in seismic while drilling(SWD),with the features of real-time, no risks of going down to the well, and high efficiency. Based on the characteristics of seismic while drilling, combined with the special layered structure of the landfill, the seismic drilling technology was used to determine the landfill gravel layer. The characteristics of seismic wave fields and the time-frequency characteristics of vibration signals in different media were investigated, the drill bit signal influenced by the drill string was analyzed and the drill bit signal was recovered based on the principle of deconvolution, wavelet transform domain correlation algorithm was put forward to detect the sub-wave delay information in case of low signal to noise ratio,and the cross-correlation-wavelet transform method was presented to pick up first break in seismic while drilling with the delay information and the characteristic frequency information,which provided a basis for the landfill near-surface velocity inversion. The numerical simulation and field experiments show that the algorithm can reach the desired effect and the research results of this paper has a certain practical significance on the gravel layer quick determining.
引文
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