New Understanding of Transient Pressure Response in the Transition Zone of Oil-Water and Gas-Water Systems

Figure 6

According to Buckley-Leverett theory, using saturation front, reservoir can be divided into three regions. The first region is between the wellbore and the downstream side of saturation front, ; the second region is between the downstream side of saturation front and the upstream side of saturation front, ; and the third region is between the upstream side of saturation front and outer boundary of the reservoir, .