TY - JOUR
T1 - Permeability enhancement and void formation by chelating agent in volcanic rocks (Ahuachapán and Berlín geothermal fields, El Salvador)
AU - Salalá, Luis
AU - Takahashi, Ryota
AU - Argueta, Jonathan
AU - Wang, Jiajie
AU - Watanabe, Noriaki
AU - Tsuchiya, Noriyoshi
N1 - Funding Information:
This study was partially supported by the Japan Society for the Promotion of Science (JSPS) through Grants-in-Aid for Scientific Research (B) (no. 22H02015 ), Challenging Research (Pioneering) (no. 21K18200 ), Early-Career Scientists (no. 21K14571 ), and Scientific Research (S) (no. 22H04932 ). This study was also supported by the Japan Science and Technology Agency (JST) and the Japan International Cooperation Agency (JICA) through JST/JICA Science and Technology Research Partnership for Sustainable Development (SATREPS) program (no. JPMJSA1703 ) and by the Sumitomo Foundation through the Grant for Environmental Research Projects (no. 203137 ).
Publisher Copyright:
© 2022
PY - 2023/1
Y1 - 2023/1
N2 - Chemical stimulation using environment-friendly chelating agents (e.g., readily biodegradable GLDA) was recently shown to rapidly and substantially enhance the permeability of fractured granite, without creating mineral precipitation. This study examined the effectiveness of such stimulation in volcanic rocks through flooding experiments conducted with a pH 4 GLDA solution on fractured dacitic, andesitic, and basaltic rocks from geothermal fields in El Salvador at 200 °C under confining pressure. Results showed substantial permeability enhancement of up to 4.3-fold in 2 h, where the magnitude of enhancement depended mainly on the initial proportion of Fe-rich phenocrysts, which dissolved to form voids.
AB - Chemical stimulation using environment-friendly chelating agents (e.g., readily biodegradable GLDA) was recently shown to rapidly and substantially enhance the permeability of fractured granite, without creating mineral precipitation. This study examined the effectiveness of such stimulation in volcanic rocks through flooding experiments conducted with a pH 4 GLDA solution on fractured dacitic, andesitic, and basaltic rocks from geothermal fields in El Salvador at 200 °C under confining pressure. Results showed substantial permeability enhancement of up to 4.3-fold in 2 h, where the magnitude of enhancement depended mainly on the initial proportion of Fe-rich phenocrysts, which dissolved to form voids.
KW - Chelating agent
KW - Chemical stimulation
KW - Enhanced geothermal system
KW - Geothermal energy
KW - Induced seismicity
KW - Permeability enhancement
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U2 - 10.1016/j.geothermics.2022.102586
DO - 10.1016/j.geothermics.2022.102586
M3 - Article
AN - SCOPUS:85140293726
SN - 0375-6505
VL - 107
JO - Geothermics
JF - Geothermics
M1 - 102586
ER -
