講演・口頭発表等

国際会議
2013年12月1日

Long-term observation of rock permeability under high pressure and temperature conditions and its microstructural interpretation

47th US Rock Mechanics / Geomechanics Symposium 2013
  • H. Yasuhara
  • ,
  • N. Kinoshita
  • ,
  • M. Takahashi
  • ,
  • S. Nakashima
  • ,
  • K. Kishida

記述言語
英語
会議種別
口頭発表(一般)

A series of long-term permeability experiments using Berea Sandstone and Horonobe Mudstone has been conducted so as to understand the evolution of rock permeability under stressed and temperature-elevated conditions. The well-controlled experiments are carried out at confining pressures of 3.0-15 MPa and temperatures of 20 or 25 and 90°C. Flow-through experiments are conducted regularly (i.e., 5 or 10 day interval) to examine the evolution of rock permeability throughout the experiments - it should be noted that each experiment is kept always more than 500 days. Effluent concentrations are also measured for the ten elements of Si, Al, K, Fe, Ca, Na, Mg, Ti, S, and Cl that are included mainly in the targeted rocks. Rock samples were prepared for a SEM-EDX and/or a micro-focus X-ray CT to observe its microstructure. The SEM-EDX observation revealed that mineral dissolution dominates over mineral precipitation, and the micro-focus X-ray CT observation shows a slight increase in pore volume for the sandstone sample that has experienced long-term confining pressure and temperature. Copyright 2013 ARMA, American Rock Mechanics Association.

リンク情報
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84892712652&origin=inward