EXPERIMENTAL STUDY OF DECOMPRESSION, PERMEABILITY AND HEALING OF SILICATE ROCKS IN FAULT ZONES
https://doi.org/10.5800/GT-2014-5-4-0162
Abstract
The article presents results of petrophysical laboratory experiments in studies of decompression phenomena associated with consequences of abrupt displacements in fault zones. Decompression was studied in cases of controlled pressure drop that caused sharp changes of porosity and permeability parameters, and impacts of such decompression were analyzed. Healing of fractured-porous medium by newly formed phases was studied. After experiments with decompression, healing of fractures and pores in silicate rock samples (3×2×2 cm, 500 °C, 100 MPa) took about 800–1000 hours, and strength of such rocks was restored to 0.6–0.7 of the original value. In nature, fracture healing is influenced by a variety of factors, such as size of discontinuities in rock masses, pressure and temperature conditions, pressure drop gradients, rock composition and saturation with fluid. Impacts of such factors are reviewed.
About the Authors
V. Ya. Medvedev
Institute of the Earth's Crust of SB RAS, Irkutsk, Russia
Russian Federation
Russian Federation
PhD in Geology and Mineralogy, Senior Researcher
Institute of the Earth’s Crust SB RAS
128 Lermontov street, Irkutsk 664033, Russia
L. A. Ivanova
Institute of the Earth's Crust of SB RAS, Irkutsk, Russia
Russian Federation
Russian Federation
PhD in Geology and Mineralogy, Senior Researcher
Institute of the Earth’s Crust SB RAS
128 Lermontov street, Irkutsk 664033, Russia
B. A. Lysov
Irkutsk State University, Irkutsk, Russia
Russian Federation
Russian Federation
PhD in Geology and Mineralogy, associate professor
Irkutsk State University, Geological Faculty
3 Lenin street, Irkutsk 664003, Russia
Tel.: 8(3952)243280
V. V. Ruzhich
Irkutsk State University, Irkutsk, Russia
Russian Federation
Russian Federation
Doctor of Geology and Mineralogy, Chief Researcher
Institute of the Earth’s Crust SB RAS
128 Lermontov street, Irkutsk 664033, Russia
Tel. +7(3952)422776; e-mail: ruzhich@crust.irk.ru
M. V. Marchuk
Irkutsk State University, Irkutsk, Russia
Russian Federation
Russian Federation
PhD in Geology and Mineralogy, Junior Researcher
Institute of the Earth’s Crust SB RAS
128 Lermontov street, Irkutsk 664033, Russia
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Review
For citations:
Medvedev V.Ya., Ivanova L.A., Lysov B.A., Ruzhich V.V., Marchuk M.V. EXPERIMENTAL STUDY OF DECOMPRESSION, PERMEABILITY AND HEALING OF SILICATE ROCKS IN FAULT ZONES. Geodynamics & Tectonophysics. 2014;5(4):905-917. (In Russ.) https://doi.org/10.5800/GT-2014-5-4-0162
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