【摘要】 在油田开发过程中,由于油层纵波速度和密度的变化,导致开发前、后的地震反射波层间时差、波形和振幅发生变化,产生时移地震响应。本文以时移地震的差异波形特征作为切入点,分析时移地震资料波形特征与油层速度变化的关系,得出以下认识:①薄油层差异波形的形态与围岩和砂岩的原始速度大小没有关系,只与砂岩油层的速度变化有关。薄油层的速度变化导致的差异波形具有规律性,即增速产生正波形,减速产生负波形;②实际研究中,在其他研究手段的基础上,利用差异波形可以直接定性解释油层速度的变化,即利用正波形判断油层速度增加,利用负波形判断油层速度减小。渤海油区的SZ36-1油田井孔开发动态资料证实,利用差异波形可以直接定性解释油层速度的变化。更多还原

【Abstract】 In the process of oilfield development, the variation of P-wave velocity and density of oil layer lead to the variations in pre- and post-developmen-t’s interlayer time difference, waveform and amplitude of seismic reflections and cause seismic time-laps response. Taking the characteristic differential seismic time-lapse waveform as a starting point, the paper analyzed the relationship between the waveform feature of time-lapse seismic data and variation of velocity in oil layer and yielded following knowledge: ①the shape of differential waveform in thin oil layer is irrelative to the original velocity in surrounding bed and sandstone and only relative to variation of velocity in sandstone of reservoir. The differential waveform resulted from velocity change in thin oil layer has regularity: increasing velocity produces positive waveform and reducing velocity produces negative waveform; ②in practical studies, based on other research means, using differential waveform can directly interpret the variation of velocity in oil layer qualitatively: using positive waveform to judge velocity increasing and negative waveform to judge velocity decreasing in oil layers. The dynamic data of well development in SZ36-1 oilfield of Bohai oil zone proved that using differential waveform could directly interpret the variation of velocity in oil layer qualitatively.更多还原