To improve effectiveness of ASP flooding, it is necessary to establish a reliable parameter design and tracking adjustment method to monitor the process of oil displacement. A differential wide field electromagnetic method was proposed and applied to the ASP displacement monitoring test in a block of the Daqing Oilfield. In the process of ASP flooding, the electromagnetic field was measured many times. The data acquired before the ASP flooding were set as the background field, and the resistivity model was obtained by inversion. Then, the resistivity data were calibrated by logging data and the resistivity model was established. Finally, the range and front of ASP flooding were deduced with the residual gradient from the spatial domain first-order difference of the resistivity model. Production data of well groups in this block have proved that this method can work out the range and front of ASP flooding accurately, providing support for optimization of ASP flooding parameters.

为了提高三元复合驱的有效性，需要建立可靠的参数设计和跟踪调整方法来监测驱油过程。提出了一种差分宽场电磁法，并将其应用于大庆油田某区块的三元复合位移监测试验。在三元复合驱油过程中，多次测量电磁场。以三元复合驱前采集的数据为背景场，通过反演得到电阻率模型。然后，通过测井数据对电阻率数据进行标定，建立电阻率模型。最后，根据电阻率模型的空间域一阶差分，利用剩余梯度推导出三元复合驱的范围和前沿。