为进一步提高三元复合驱驱油效率,优化驱油参数和跟踪调整技术,提出了基于差分广域电磁法的三元复合驱监测方法,并应用于大庆油田某区块的三元复合驱监测试验中。驱油过程中多次采集电磁场响应,将驱替前采集数据设为背景场,反演得到电阻率模型;然后利用测井电阻率数据进行标定,建立电阻率模型;最后基于电阻率模型的空间域一阶差分,采用残差梯度推断三元复合驱体系分布范围和前缘位置。井组生产数据验证了此方法可有效推断三元复合驱体系分布范围和前缘位置,为驱油注采参数优化提供数据支持。图8表3参14
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