Experimental Study on the Effect and Mechanism of Chemical Stimulation on Deep High-Temperature Granite
Chemical stimulation has been increasingly applied to improve the performance of geothermal reservoirs since early 1980s. The potential for the successful application of this technique to high-temperature reservoirs hosted in granitic rocks is still uncertain, and one of the keys to assess this pote...
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Frontiers Media S.A.
2022-05-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.893969/full |
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| author | Zhenpeng Cui Zhenpeng Cui Shuantong Shangguan Fabrizio Gherardi Xiaofei Qi Jianan Xu Jianan Xu Siqing He Siqing He Bo Feng Bo Feng |
| author_facet | Zhenpeng Cui Zhenpeng Cui Shuantong Shangguan Fabrizio Gherardi Xiaofei Qi Jianan Xu Jianan Xu Siqing He Siqing He Bo Feng Bo Feng |
| author_sort | Zhenpeng Cui |
| collection | DOAJ |
| description | Chemical stimulation has been increasingly applied to improve the performance of geothermal reservoirs since early 1980s. The potential for the successful application of this technique to high-temperature reservoirs hosted in granitic rocks is still uncertain, and one of the keys to assess this potential is to investigate experimentally the geochemical reactivity induced via chemical stimulation on relevant rock specimens. On this premise, we combined high-temperature and high-pressure dynamic simulation and static corrosion experiments to explore the effect of different chemical stimulants on the permeability of granite samples from the Baimiao formation (Hebei Province, China). Experimental results show that NaOH-dominated alkaline stimulants cause only weak dissolution patterns on primary feldspar and quartz, and they do not sensitively affect the original amount of chlorite. The overall effect is a negligible enhancement of the original permeability of all the granite specimens analyzed. Conversely, a large increase in permeability is observed when an acid mixture of 10wt% HCl + 1.5wt% HF is used as a stimulant, with an observed maximum magnifying effect of about 27 times, due to the effective dissolution of feldspar and chlorite. Though quartz appears not to be affected by dissolution, a relatively large amount of secondary neo-formed amorphous silica is also documented. |
| first_indexed | 2024-04-12T10:50:35Z |
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| id | doaj.art-f6e49013e1264ad2ba6fdf5af95f7d4a |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-12T10:50:35Z |
| publishDate | 2022-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-f6e49013e1264ad2ba6fdf5af95f7d4a2022-12-22T03:36:16ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-05-011010.3389/feart.2022.893969893969Experimental Study on the Effect and Mechanism of Chemical Stimulation on Deep High-Temperature GraniteZhenpeng Cui0Zhenpeng Cui1Shuantong Shangguan2Fabrizio Gherardi3Xiaofei Qi4Jianan Xu5Jianan Xu6Siqing He7Siqing He8Bo Feng9Bo Feng10Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, ChinaEngineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun, ChinaNo.2 Exploration Team, Hebei Bureau of Coal Geological Exploration, Xingtai, ChinaInstitute of Geosciences and Earth Resources, Italy National Research Council, Pisa, ItalyNo.2 Exploration Team, Hebei Bureau of Coal Geological Exploration, Xingtai, ChinaKey Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, ChinaEngineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun, ChinaKey Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, ChinaEngineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun, ChinaKey Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, ChinaEngineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin University, Changchun, ChinaChemical stimulation has been increasingly applied to improve the performance of geothermal reservoirs since early 1980s. The potential for the successful application of this technique to high-temperature reservoirs hosted in granitic rocks is still uncertain, and one of the keys to assess this potential is to investigate experimentally the geochemical reactivity induced via chemical stimulation on relevant rock specimens. On this premise, we combined high-temperature and high-pressure dynamic simulation and static corrosion experiments to explore the effect of different chemical stimulants on the permeability of granite samples from the Baimiao formation (Hebei Province, China). Experimental results show that NaOH-dominated alkaline stimulants cause only weak dissolution patterns on primary feldspar and quartz, and they do not sensitively affect the original amount of chlorite. The overall effect is a negligible enhancement of the original permeability of all the granite specimens analyzed. Conversely, a large increase in permeability is observed when an acid mixture of 10wt% HCl + 1.5wt% HF is used as a stimulant, with an observed maximum magnifying effect of about 27 times, due to the effective dissolution of feldspar and chlorite. Though quartz appears not to be affected by dissolution, a relatively large amount of secondary neo-formed amorphous silica is also documented.https://www.frontiersin.org/articles/10.3389/feart.2022.893969/fulllaboratory experimentmechanism analysisenhanced geothermal systemchemical stimulationpermeability modificationsecondary precipitation |
| spellingShingle | Zhenpeng Cui Zhenpeng Cui Shuantong Shangguan Fabrizio Gherardi Xiaofei Qi Jianan Xu Jianan Xu Siqing He Siqing He Bo Feng Bo Feng Experimental Study on the Effect and Mechanism of Chemical Stimulation on Deep High-Temperature Granite Frontiers in Earth Science laboratory experiment mechanism analysis enhanced geothermal system chemical stimulation permeability modification secondary precipitation |
| title | Experimental Study on the Effect and Mechanism of Chemical Stimulation on Deep High-Temperature Granite |
| title_full | Experimental Study on the Effect and Mechanism of Chemical Stimulation on Deep High-Temperature Granite |
| title_fullStr | Experimental Study on the Effect and Mechanism of Chemical Stimulation on Deep High-Temperature Granite |
| title_full_unstemmed | Experimental Study on the Effect and Mechanism of Chemical Stimulation on Deep High-Temperature Granite |
| title_short | Experimental Study on the Effect and Mechanism of Chemical Stimulation on Deep High-Temperature Granite |
| title_sort | experimental study on the effect and mechanism of chemical stimulation on deep high temperature granite |
| topic | laboratory experiment mechanism analysis enhanced geothermal system chemical stimulation permeability modification secondary precipitation |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.893969/full |
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