Hydrogeochemical Characteristics and Geothermometry Applications of Thermal Waters in Coastal Xinzhou and Shenzao Geothermal Fields, Guangdong, China

Table 9

The differences (in percentage) between the reservoir temperatures estimated by solute geothermometers for thermal waters and the average measured bottom-hole temperature of the geothermal wells.

Geothermometer	Difference percentage between the estimated reservoir temperature and respective BHTs
	In Xinzhou geothermal field			In Shenzao geothermal field
	0–20%	20%–30%	>30%	0–20%	20%–30%	>30%
Quartz, no steam loss [23]	0	0	8	0	0	4
Quartz [24]	0	0	8	0	0	4
Chalcedony [23]	8	0	0	3	1	0
Na-K [25]	0	0	8	0	0	4
Na-K-Ca [26]	7	1	0	1	3	0
K-Mg (Giggenbach et al., 1983)	1	3	4	4	0	0
Na–Li [27]	0	0	8	0	0	4

Average bottom-hole temperature (BHT) of 135°C for geothermal wells calculated from the compiled southwestern Guangdong geothermal wells database of the Geological Survey of Guangdong Province (1988).