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Rock Study for Waste Disposal

#0793


Experimental and Theoretical Study of Chemical and Physical Properties of Rocks as natural Barrier in Radioactive Waste Disposal

Tech Area / Field

  • ENV-WDS/Waste Disposal/Environment

Status
8 Project completed

Registration date
10.11.1996

Completion date
20.04.1999

Senior Project Manager
Novozhilov V V

Leading Institute
GERS, Russia, Murmansk reg., Zapolyarny

Supporting institutes

  • VNIPI Promtechnology, Russia, Moscow\nVNIITF, Russia, Chelyabinsk reg., Snezhinsk

Collaborators

  • Geological Survey of Japan, Japan, Tsukuba\nRadioactive Waste Management Center, Japan, Tokyo

Project summary

The integrated experimental and theoretical investigations of physical (reservoir, mechanical and other) properties of rocks and soils under various thermodynamically parameters of the Earth crust to define the optimum geological conditions for radiowaste disposal is the main goal of the present Project.

The novelty of the given project is that additionally to the traditional theoretical, laboratory petrophysical and geophysical investigations of physical properties of rocks, the radically new advanced theoretical and experimental study methods of permeability, elastic, mechanical, thermal and other properties of rocks and soils at various simulated PT- conditions of the Earth crust, models of multiphase filtration in the low-porous media, thermodynamically calculations of intergranular filtration and many others, will be worked out and used.

For this purpose the present Project provides radically new experimental study of physical properties of rocks at high pressure and temperature: an effect of seismic action on filtration properties, an influence of water-saline fluids on elastic properties and microstructure of rocks, an influence of deferential stress on mechanical, filtration and anisotropic properties and others.

Theoretical investigations in the field of numerical simulation of filtration processes on the macro and micro levels, such as creation of a mathematical model of single-phase and two-phase filtration in the neighborhood of well taking into account poro-elastic properties of media, of stress-strain state and complicated geometry of rockbeds, micro-simulation of multiphase filtration in low-porous media with consideration for various capillary effects, numerical simulation and thermodynamical calculations of intergranular filtration and others. Mathematical model effective thermal conductivity of rocks and its application for the analysis of structure porous of space of collectors will be developed.

The database created earlier will be considerably extended and supplemented by new materials on filtration, physico-mechanical, thermal other parameters at such unique object as Semipalatinsk test field. Determination of the rates of underground fluids and of radionuclides migration through fractured-rocky massif (by the example of Semipalatinsk nuclear test-field) after a performance of underground nuclear explosion was carried out.

It is supposed also to elaborate, using the information database on physical properties of rocks created earlier, an information system and a package of applied software for numerical simulation of filtration processes in stressed geological media suitable for radiowaste disposal.

Scientific importance of the planned work lies in defining fundamental tendencies of changes in permeability and other physical properties of various types of rocks according to the conditions in situ; in elaboration and approbation of new experimental and theoretical research methods as applied to safe radiowaste disposal in the deep horizons of the Earth crust.


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