Injection-Triggered Occlusion of Flow Pathways in Geothermal Operations

Table 2

Results of hydrochemical modeling. Saturation index shows the possibility of precipitation of indicated minerals in the respective scenario (2P: production site, 1I: injection site, and equ.: equilibrium).

Supersaturated minerals		2P in equ. with rock	1I in equ. with rock	1I in equ. with rock + acidation	1I in equ. with rock + acidation + drill mud
Mineral phase	Mineral formula	Saturation index	Saturation index	Saturation index	Saturation index
Albite	NaAlSi3O8	4.99	4.99	4.99	5.45
Anhydrite	CaSO4	0.54	0.09	0.09	0.61
Anorthite	CaAl2Si2O8	8.43	7.55	7.54	8.39
Barite	BaSO4	0.33	0.59	0.59	0.87
Ca-Montmorillonite	Ca0.165Al2.33Si3.67O10(OH)2	0.06	−0.17	−0.17	0
Celestite	SrSO4	0.71	0.07	0.07	0.19
Chlorite (14A)	Mg5Al2Si3O10(OH)8	64.45	65.39	65.38	69.24
Chrysotile	Mg3Si2O5(OH)4	37.16	38.34	38.33	40.63
Gypsum	CaSO4:2H2O	0.58	0.22	0.22	0.68
Hausmannite	Mn3O4	4.11	3.69	3.68	5.56
Pyrochroite	Mn(OH)2	4.04	5.61	5.6	6.22
Sepiolite	Mg2Si3O7.5OH:3H2O	23.42	24.93	24.92	26.39
Sepiolite(d)	Mg2Si3O7.5OH:3H2O	20.23	22.37	22.36	23.82
Talc	Mg3Si4O10(OH)2	40.34	41.02	41.01	43.34