Residual oil in Yakela Cretaceous condensate gas reservoir

Yakela Cretaceous condensate gas reservoir is a deep gas reservoir with high temperature, high pressure, and edge water. It has been keeping stable production for 10 years until now. Since the advance speed of edge water is increasing, the water control of gas reservoir is difficult and the production is declining apparently. The gas reservoir is hard to maintain a stable situation now. By carrying out a fine contrast of small layers, and integrating with the logging information of residual oil saturation, we studied residual oil distribution, and proposed four types of residual oil:interlayer residual oil in the Upper Cretaceous, interlayer residual oil in the Lower Cretaceous, intralayer residual oil (at the bottom of upper gas layer), and water-flooded residual oil. It laid a foundation for residual oil development in the future.