The resistivity anomalies for the field show that it is composed of two parts. The upper part has 3 km2 of area and 1000

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The resistivity anomalies for the field show that it is composed
of two parts. The upper part has 3 km2 of area and 1000 m thickness
consists of marbles with the density of 2.65 ˟ 10-3 gr/cm3. Fluid
temperature, porosity, specific heat of rock and density of
reservoir fluid for the upper part are 205 C, % 7, 0.9 kJ/kgC and
861 kg/m3, respectively. However, the lower part is hotter than
upper part with 240 C reservoir fluid temperature. The lower part
has 3.5 km2 of area and 1700 m thickness consists of schist and
marbles with the density of 2.80 ˟ 10-3 gr/cm3. Porosity, specific
heat of rock and density of fluid for the lower part are % 4, 0.9
kJ/kgC and 825 kg/m3, respectively. Specific heat of reservoir
fluid can be assumed to be 4.18 kJ/kgC. Reservoir rocks and fluid
are in thermally equilibrium.
Assuming the reference temperature as average atmospheric
temperature 20 C, calculate the total volumetric stored heat
of the geothermal reservoir in terms of GJ.