|
The red circles in the above temperature model represent temperature build-up estimates of the undisturbed subsurface temperatures. In the absence of strong subsurface fluid movement, temperatures should increase with depth. The strong negative temperature gradients at -500 to -1000 ft, -2500 to -3500 ft, -4500 to -5000 ft, and -5000 to -5500 ft all appear to be above high permeability reservoirs charged with cooler waters, from shallower depths, moving through them. Rainfall in this area is over 100 in/year, producing a rugged karst topography in the surface limestones. A three phase reservoir here had almost no oil leg on the up-gradient side with a significant oil leg on the down gradient side, because of a tilted oil/water contact due to high regional flow rates in the water leg. |
|