松辽盆地北部第四系高频地震信号损耗规律

Study of high frequency seismic signal attenuation in Quaternary layers of northern Songliao Basin

1. 大庆石油学院勘探系,安达151400;2. 东北煤田第二物探公司,长春130031;3. 大庆石油管理局勘探开发研究院,大庆163712

Department of Exploration, Daqing Petroleum institute, Anda 151400

油田开发要求开发地震视频率必须达到150～170Hz, 目前距离这个标准相差很远。本文通过研究松辽盆地第四系对地震反射波的吸收过程后, 认为造成这种差距的主要原因是第四系近地表层和第四系深层对高频成份的吸收, 开发地震激发点和接收点都不能安置在这些层位中, 至少不能安置于近地表层中, 采集频率才可能大幅度提高。

Oilfield development requires that the apparent frequency of seismic survey reach150-170 Hz, which is a standard far beyond current level. Through the research on reflectedwave absorption in the Songliao Basin, we think that the disparity is mainly due to the absorptionof high frequency components by Quaternary layers. In order to greatly improve the seismicacquisition frequency, seimsic sources and receivers should not be set in these Quaternary layers,at least in the near-surface layers.