Open AccessExperimental study of decompression, permeability and healing of silicate rocks in fault zones
Author(s) -
В. Я. Медведев,
Л. А. Иванова,
Б. А. Лысов,
В. В. Ружич,
М. В. Марчук
Publication year - 2014
Publication title -
geodinamika i tektonofizika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.336
H-Index - 8
ISSN - 2078-502X
DOI - 10.5800/gt-2014-5-4-0162
Subject(s) - petrophysics , decompression , permeability (electromagnetism) , geology , porosity , petrology , silicate , classification of discontinuities , mineralogy , saturation (graph theory) , pressure drop , drop (telecommunication) , petroleum engineering , geotechnical engineering , chemistry , mechanics , surgery , medicine , mathematical analysis , telecommunications , biochemistry , physics , mathematics , combinatorics , membrane , computer science , organic chemistry
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.