Not familiar with much below the Chicot and Evangeline aquifers as I am interested in finding drinking water. I would not doubt it though, as both aquifers get deeper and somewhat thicker as they progress south. The Evangeline Aquifer is brackish north of Lafayette and is flat out salty the closer you get to the Gulf of Mexico. Likewise for the Chicot but it gets Brackish near Abbeville and further south. The Chicot Aquifer really gets messed up around salt domes though. Very irregular water quality. I guess due to the eruption of the dome.