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Energies 2015, 8(7), 7202-7223; doi:10.3390/en8077202

Investigation of Fault Permeability in Sands with Different Mineral Compositions (Evaluation of Gas Hydrate Reservoir)

Reservoir Modeling Team, Methane Hydrate Research Centre, National Institute of Advanced Industrial Science and Technology (AIST), 2-17-2-1 Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan
Current Address: Research Institute of Innovative Technology for the Earth (RITE), 9-2 Kizugawa-dai, Kizugawa, Kyoto 619-0292, Japan;
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Author to whom correspondence should be addressed.
Academic Editor: Richard B. Coffin
Received: 26 March 2015 / Revised: 4 July 2015 / Accepted: 7 July 2015 / Published: 16 July 2015
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Abstract

We used a ring-shear apparatus to examine the perpendicular permeability of sands with different mineral compositions to evaluate fault behavior around gas hydrate reservoirs. The effect of effective normal stress on the permeability of two sand types was investigated under constant effective normal stresses of 0.5–8.0 MPa. Although Toyoura sand and silica sand No. 7 mainly comprise quartz, silica sand No. 7 contains small amounts of feldspar. For Toyoura sand, the permeability after ring-shearing dramatically decreased with increasing effective normal stress up to 3.0 MPa, then gradually decreased for stresses over 3.0 MPa, whereas the permeability after ring-shearing of silica sand No. 7 rapidly decreased with increasing effective normal stress up to 2.0 MPa. Although the relationships between the permeability after ring-shearing and effective normal stress for both sands could be expressed by exponential equations up to 3.0 MPa, a more gradual change in slope was shown for Toyoura sand. The permeabilities of both sands were almost equal for effective normal stresses over 3.0 MPa. The mineralogical properties of the small amount of feldspar in the sample indicate that both mineralogy and original grain size distribution affect the fault permeability and shear zone formation. View Full-Text
Keywords: permeability; fault; porosity; normal stress; mineralogy; grain size; ring-shear permeability; fault; porosity; normal stress; mineralogy; grain size; ring-shear
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kimura, S.; Kaneko, H.; Ito, T.; Minagawa, H. Investigation of Fault Permeability in Sands with Different Mineral Compositions (Evaluation of Gas Hydrate Reservoir). Energies 2015, 8, 7202-7223.

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