煤层下部地层地震成像研究

Research on seismic imaging of the lower part of coal seam

以内蒙地区某煤田三维地震资料为例,对煤层下部地震成像效果不佳的原因进行分析。在资料处理环节,对影响煤层下部成像效果的面波和多次波,根据空间和频率等特性进行压制和衰减;在地表激发条件差、震源能量衰减迅速、煤层对下部反射有强烈屏蔽作用的情况下,对弱信号进行针对性的补偿和保护。实际资料处理,得到了较满意的成像效果。

The paper, taking 3D seismic data in Inner Mongolia as an example, analyzed the reasons for the poor effect of seismic imaging of the lower part of coal seam. In data processing, surface wave and multiple wave af-fecting the imaging effect of the lower part of coal seam were depressed and decayed according to the space and frequency characteristics. In case of poor excitation condition, rapid decay of seismic source energy and strong shieling effect of coal seam for the lower part,weak signals were compensated and protected. The actual data processing obtained satisfactory imaging effect.