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为了用声波测井资料(或可能得到的密度测井资料)计算合成垂直地震剖面(SVSP),本文设计了一种时间域模型。这种SVSP在地震资料解释中是非常有用的,它可以帮助解释人员从深度及时间上分析震源脉冲通过地层的传播情况。以前的合成地震记录技术分析的仅仅是在地表检测到的地层对震源脉冲的响应;而SVSP计算显示了在地下任意深度点上检测到的地层对震源脉冲的响应,使我们可以深入了解全部波的传播情况。例如,合成地震记录可用于辨别地震剖面上的多次波同相辅,而SVSP不仅可用来识别多次波,而且能表明震源脉冲通过地层产生多次波的路径。 SVSP也可以用来分析由于地层成层作用的效应(如薄层层序效应)而产生的震源脉冲的特征变化;研究由于透射损耗带来的振幅变化;检查最终的地面地震记录上不同震源脉冲带宽的影响等等。根据解释人员的实践经验,本文还提出了SVSP的更多的用途。
In order to calculate the synthetic vertical seismic profile (SVSP) using sonic log data (or possibly density log data), a time-domain model is designed. This SVSP is very useful in seismic data interpretation to help explain the depth and time involved in analyzing the propagation of a source pulse through the formation. Previous synthetic seismographic techniques analyzed only the surface-detected stratum response to the source pulse; whereas the SVSP calculation revealed the response of the stratum to the source pulse at any depth below the subsurface, enabling us to gain insight into the full wave The spread of the situation. Synthetic seismograms, for example, can be used to identify multiple in-phase complements on seismic sections, and SVSP can be used not only to identify multiple waves, but also to indicate multiple pathways of source pulses through the formation. SVSP can also be used to analyze feature variations of source pulses due to effects of stratigraphic stratigraphy such as thin-layer sequence effects; to study changes in amplitude due to transmission losses; to check for different source pulses in the resulting ground-based seismic record The impact of bandwidth and so on. Based on the practical experience of interpreter, this article also proposed more uses of SVSP.