Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume 121, Issue 11, Pages 8080-8098Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016JB013365
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Funding
- Japan Society for the Promotion of Science [21360446, 25249131]
- ENEOS Hydrogen Trust Fund
- Grants-in-Aid for Scientific Research [21360446, 25249131] Funding Source: KAKEN
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We conducted hydraulic fracturing (HF) experiments on 170mm cubic granite specimens with a 20mm diameter central hole to investigate how fluid viscosity affects HF process and crack properties. In experiments using supercritical carbon dioxide (SC-CO2), liquid carbon dioxide (L-CO2), water, and viscous oil with viscosity of 0.051-336.6 mPa.s, we compared the results for breakdown pressure, the distribution and fracturing mechanism of acoustic emission, and the microstructure of induced cracks revealed by using an acrylic resin containing a fluorescent compound. Fracturing with low-viscosity fluid induced three-dimensionally sinuous cracks with many secondary branches, which seem to be desirable pathways for enhanced geothermal system, shale gas recovery, and other processes.
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