Representation of Fracture Zone Interpretation Uncertainty in 3D Geological Models of the Mizunami Underground Research
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Matthew J. White1 and Hiromitsu Saegusa2 1 Galson Sciences Limited, 5 Grosvenor House, Melton Road, Oakham, Rutland, LE15 6AX, UK. 2 Tono Geoscience Centre, Japan Nuclear Cycle Development Institute 1-63, Yamanouchi, Akeyo-cho, Mizunami-shi, Gifu 509-6132, Japan $%675$&7
The Japan Nuclear Cycle Development Institute (JNC) is undertaking research into the deep geological environment in Japan in the Tono area of Japan. In the Mizunami Underground Research Laboratory (MIU) Project, located in the Tono area, JNC is carrying out surface-based investigations and will excavate an Underground Research Laboratory (URL) in order to establish comprehensive techniques for investigating and characterising the geological environment. The MIU Project focuses on the investigation of the granitic rocks of the Toki Granite. The geological structure and hydrogeological properties of the Toki Granite are closely affected by the regional fracture zones and faults. The interpretation of these features is undertaken in 3D and directly linked into 3D hydrogeological models. Significant uncertainty exists in the 3D interpretation of the fracture zones, and geologists must make several assumptions regarding the 3D structure in order to develop the 3D interpretation. In order that these assumptions are communicated to the hydrogeologists, a methodology has been developed for representing uncertainty in the 3D geological models. An important part of the uncertainty representation, is the development of a fracture zone classification in which the uncertainty in both the presence and the geometry of the fracture zone is assigned. Other elements include the development of alternative models, visualisation of raw data, development of conceptual models, development of bounding models, and suitable quality assurance and archiving of modelling projects. ,1752'8&7,21 The Japan Nuclear Cycle Development Institute (JNC) is undertaking research into the deep geological environment in Japan in the Tono area of Japan. In the Mizunami Underground Research Laboratory (MIU) Project, located in the Tono area, JNC is carrying out surface-based investigations and will excavate an Underground Research Laboratory (URL) in order to establish comprehensive techniques for investigating and characterizing geological environment [1]. The MIU Project focuses on the investigation of the granitic rocks of the Toki Granite, which is of Cretaceous age. At the MIU construction site the Toki Granite is overlain by Tertiary sedimentary rocks (the Miocene Mizunami Group and the Pliocene Seto Group). The MIU Project is currently in Phase I, which consists of surface-based investigations (drilling of boreholes, acquisition of geophysics and surface based mapping). Phase II of the MIU Project, construction of the URL shafts, is due to commence in 2003. A key element in the surface-based investigations for the MIU Project is the construct
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