多层介质中三维地震模型实验的复杂波场分析

AN ANALYSIS OF COMPLEX WAVEFIELD IN MULTI-LAYER MEDIA BY 3-D SEISMIC MODELLING

武汉地质学院

本文结合HQ地区复杂地质结构的三维地质模型,开展超声波模拟实验的波场观测和分析,获得了多层介质复杂波场的超声模型记录。从获得的超声模拟时间剖面上可见,在复杂地质结构情况下,单层反射界面会显示成“似多层”同相轴的时间剖面,显得同实际地质剖面有很大的差异。因此,在复杂地质结构地区应进行复杂波场的偏移归位和三维地震勘探;在解释中还应注意各种特殊波的研究。多层介质对复杂波场的影响,文章亦作了讨论和研究。

In the light of 3-D model made on the complex geological structures in HQ area, an observation and analysis of the wavefield using the ultrasonic analog experiment are made. As a result, the ultrasonic model records of the complex wavefield in multi-layer media are obtained. It can be seen from the ultrasonic analog time sections obtained that there seems to be a significant discrepency between what are obtained under the complex geological structures and the actual geological sections. A single reflection horizon may reveal a time section of "multi-layer like" lineups, so it follows that the migration technique and 3-D seismic survey should be conducted in the complex structural area. In addition, efforts should be made to the study of "unusual waves" during interpretation.Moreover, the interconnection between the multi-layer media and complex wavefield is discussed and reviewed in the paper.