A NUMERICAL MODEL SIMULATING EVOLUTION OF FRACTURE PERMEABILITY MODERATED BY MECHANICALLY- AND CHEMICALLY-INDUCED DISSOLUTION
A numerical model is presented to describe the evolution of fracture aperture (and related permeability) mediated by the competing chemical processes of pressure solution and free-face dissolution/precipitation; pressure (dis)solution and precipitation effect net-reduction in aperture and free-face dissolution effects net-increase. The model enables changes in aperture and solute concentration within a fracture to be followed with time for arbitrary driving effective stresses, fluid and rock temperatures, and fluid flow rates. This allows a systematic evaluation of evolving linked mechanical and chemical processes. Changes in fracture aperture and solute concentration tracked within a well-constrained flow-through test completed on a natural fracture in novaculite are compared with the distributed parameter model. These results show relatively good agreement, excepting an enigmatic abrupt reduction fracture aperture in the early experimental period.
Hideaki Yasuhara Derek Elsworth
Ehime University, Japan The Pennsylvania State University, USA
国际会议
南京
英文
322-327
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）