(GP/GT) for Additional Water Supply in the Lower Rio Grande

average depth of 10,033 feet, average pressure gradient of 0.745
psi/ft., and average temperature of 264°F, was picked as a potential
reservoir because of its lateral persistence, and the extremely low
salinity (4,000 ppm Cl) of the connate water.
It should be noted here that the depths referred to in the
discussion, an~
indicated in the tables, are log depths uncorrected
to sea level. All logs did not indicate the elevation from which
the log was taken, _ and all logs did not indicate the ground
elevation or the elevation of the rig floor and Kelly bushing.
Average elevation within the study area is less than 100 feet above
sea level; therefore, all depths should be corrected by a factor of
approximately 80 feet. This difference does not have a bearing on
values for temperature, pressure, porosity and permeability.
While both reservoirs have similar pressure gradients,
reservoir C has much higher average temperatures, and reservoir B
has much lower water salinities. Reservoir B would appear to have
potential as a
water source in addition to the geopressuregeothermal
potential.
Previous Investigations
Previous investigations of the geothermal-geopressure
potential of reservoirs in the south Texas area have been carried
out by numerous entities, both private and public. Gulf Geothermal
Corp. of Baton Rouge, La., and Magma Gulf Co. of Houston, Tx.,
conducted studies in the early 1970's with the intent to lease
large tracts for possible drilling (Durham and others, 1974).
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