Buckles plot

Figure 1 How a Buckles plot relates to capillary pressure, fluid distribution, and fluid recovery in a reservoir.

A Buckles plot is a plot of water saturation (S_w) vs. porosity. Contours of equal bulk volume water (BVW) are drawn on the plot.

• Points plot on a hyperbolic BVW line where the formation is near immobile water if the points come from a reservoir with consistent pore type and pore geometry.
• Points scatter on a Buckles plot where the formation falls below the top of the transition zone.

Figure 1 shows how a Buckles plot relates to capillary pressure, fluid distribution, and fluid recovery in a reservoir.