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将中国东部老油田长期水驱开采中引起的储层物性变化换算成速度变化时,发现这种速度变化明显大于只计算水置换油时所引起的速度变化。根据这一特征,可利用地震资料来预测剩余油的分布。应用时间推移地震求取水驱开采前后两次三维地震的振幅差异时,由于突出了流体的地震响应差异,比直接应用常规地震油气检测技术预测剩余油分布更为有效,而模型和实例也证明了该方法的可行性。最后,提出了一种利用时间推移地震进行叠前含油饱和度反演并预测剩余油分布的更为精确的方法。
When the reservoir physical properties caused by long-term waterflooding in the old oilfields in eastern China were converted into velocity changes, the change in velocity was found to be significantly greater than the change in velocities caused by water displacement oil only. According to this feature, seismic data can be used to predict the distribution of remaining oil. When applying the time-lapse earthquake to obtain the amplitude difference between the two 3D seismic waves before and after the waterflooding, it is more effective to predict the remaining oil distribution by directly applying the conventional seismic oil-gas detection technology because of the difference of the seismic response of the fluid. The model and the example also prove that The feasibility of this method. Finally, a more accurate method for the inversion of prestack oil saturation using time-lapse seismic and prediction of remaining oil distribution is proposed.