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在复杂地表区,激发出高能量、宽频带的地震波是改进复杂地表地区地震资料质量的关键。在地震采集中,通过分析近地表地震波的传播特点,优选激发参数,来提高地震波的激发质量。本文利用双井微测井资料对准噶尔盆地山前带沙漠戈壁区的近地表地震波传播特点进行分析,总结出不同激发深度对地震波频率、信噪比的影响特点,提出科学确定激发井深的理论依据。在中部4区块和中部1区块生产中推广应用,取得了较好的勘探效果。
In complicated surface areas, the excitation of high-energy and broadband seismic waves is the key to improving the seismic data quality in complex surface areas. In seismic acquisition, by analyzing the propagation characteristics of near-surface seismic waves and optimizing the excitation parameters, the excitation quality of seismic waves can be improved. This paper analyzes the characteristics of near-surface seismic wave propagation in the desert Gobi area in the foreland belt of the Junggar Basin by using double-well micro-logging data and summarizes the characteristics of different excitation depths on the seismic wave frequency and signal-to-noise ratio and proposes a scientific basis for determining the excitation well depth . It has been popularized and applied in Block 4 in Central China and Block 1 in Central China, and has achieved good exploration results.