梨树断陷地震剖面极性问题探讨

摘要

Whether the polarity of the seismic reflection wave is positive or negative has been an important issue in the in-terpretation of seismic data.This paper ensures the used seismic data to be positive by acoustic synthetic seismogram.Further-more,it was found that the emission characteristics of the top boundary of the Huoshiling formation were different correspond-ing to work site of the same work area during the contiguous three-dimensional interpretation of the Lishu fault depression. This reveals that the combination of polarity and lithology determines the seismic reflection characteristics by analyzing.Polari-ty problem is related to the crests and troughs in the seismic section,which represent different geological significance.Finally, this feature is used to identify the stratigraphic overlap boundary and to implement stratigraphic traps.%地震反射波的极性是正还是负,一直是地震资料解释的重要问题.利用声波合成地震记录法确定所用地震数据为正常极性,并且在梨树断陷连片三维解释过程中,发现同一工区内火石岭组顶界面在不同的工区位置表现的发射特征不同.通过分析认为,极性、岩性组合决定了地震反射特征的不同.极性问题关系到地震剖面上的波峰、波谷,分别代表着不同的地质意义,最后利用这一特点,识别地层超覆边界,落实地层圈闭.