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随着勘探工作向深部发展,地震数据的信噪比分辨率要求越来越高.均匀振幅加权定向地震波方法(即基于接收阵列的时域地震波束形成方法,简称TSBBRA),可以增强目标信号、降低噪声,改善地震数据的质量.然而增大TSBBRA的控制参数N,会导致地震有效波束变窄,主波束不能覆盖整个接收排列,有时达不到对数据质量的要求.余弦振幅加权定向地震波方法(SDBCAD)通过余弦振幅加权展宽波束,能改善上述问题.过去对SDBCAD方法改善程度的研究仅限于理论模型上的研究,为了进一步探讨SDBCAD方法与TSBBRA方法对实际数据质量的影响,在吉林省农安县哈拉海镇开展了对比实验研究.通过TSBBRA和SDBCAD的实验剖面对比可知,SDBCAD方法能够在满足勘探精度要求的情况下合理展宽定向地震波束,能够更有效覆盖接收排列,表明了SDBCAD方法在宽接收排列情况下,能够更显著地改善地震数据质量.
With the development of deep exploration, the signal-to-noise ratio (SNR) resolution of seismic data is getting higher and higher.Uniform amplitude-weighted directional seismic wave method (ie, receiving array-based time domain seismic beamforming method, referred to as TSBBRA) can enhance the target signal, Reduce the noise and improve the quality of the seismic data.However, increasing the control parameter N of TSBBRA will result in the seismic effective beam narrowing, the main beam can not cover the entire receiving arrangement, and sometimes the data quality can not be achieved.Corresponding to the cosine amplitude weighted directional seismic wave method (SDBCAD) This problem can be ameliorated by cosine amplitude-weighted broadening beams.In the past, the research on the improvement of SDBCAD method was limited to the theoretical model. In order to further explore the impact of SDBCAD method and TSBBRA method on the actual data quality, By comparing the experimental profiles of TSBBRA and SDBCAD, we can see that the SDBCAD method can broaden the directional seismic beams reasonably when the exploration accuracy is satisfied and cover the receiving arrangement more effectively, which shows that the SDBCAD method With a wide receiver arrangement, seismic data quality can be significantly improved.