Numerical Modeling of Reactive Transport and Self-Sealing Processes in the Fault-Controlled Geothermal System of the Guide Basin, China

Table 1

Water chemistry and temperatures in recharge and discharge waters from the Zhacang geothermal field of Guide Basin (mg/L). The temperature of ZR1 refers to the sampling temperature (90°C); the bottom temperature is measured at 151.34°C.

Sample no.	ZR1	G1	G2	G3	G4	G5
Location	Borehole ZR1	Zhacang Valley	Zhacang Valley	Zhacang Valley	Hotspring Village	Gangyi Spring
Date	2017.09.09	2016.08.14	2016.08.14	2015.08.15	2015.07.27	2017.09.09
Description	Borehole	Hot spring	Hot well	Hot well	Hot well	Cold spring
Depth (m)	3050.7	Artesian	100.0	100.0	Unknown	Artesian
Elevation (m)	2514	2500	2500	2505	2475	2781
T (°C)	90.0	70.4	78.3	80.0	66.2	11.0
pH	8.33	8.20	7.99	8.40	8.36	8.21
K^+	23.44	17.14	19.18	19.90	15.90	6.96
Na^+	369.23	389.19	389.82	448.00	429.00	441.18
Ca^2+	55.26	63.01	59.14	58.20	72.80	157.25
Mg^2+	1.59	3.94	0.55	0.98	3.92	124.38
Al^3+	0.096	0.038	0.068	—	—	0.005
TFe	0.0050	0.0026	0.0020	—	—	0.0120
Cl^-	359.76	334.11	334.26	334.00	351.00	696.63
SO4^2-	383.43	532.54	533.09	562.00	538.00	474.65
HCO3^-	39.92	55.79	53.80	39.70	73.30	244.09
CO3^2-	11.32	0.00	0.00	18.00	3.00	0.00
SiO2	125.61	93.40	87.79	56.69	76.35	11.76
TDS	1243.95	1401.05	1391.45	1480.78	1489.12	2339.38
Type	Cl·SO4-Na	SO4·Cl-Na	SO4·Cl-Na	SO4·Cl-Na	SO4·Cl-Na	Cl·SO4-Na·Mg

—: not detected.