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Pressure dependence of permeability and Earth tide induced fluid flow
Author(s) -
Millich E.,
Neugebauer H. J.,
Huenges E.,
Nover G.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl00395
Subject(s) - permeability (electromagnetism) , geology , fluid dynamics , residual , fluid pressure , pore water pressure , porosity , porous medium , geotechnical engineering , mechanics , petrology , geophysics , chemistry , biochemistry , physics , algorithm , membrane , computer science
New in situ measurements of the pressure dependence of permeability at the Continental‐Deep‐Drilling Project in Windisch‐Eschenbach/Germany (KTB) indicate a much stronger sensitivity compared to measurements of core samples. The non‐linear pressure‐dependent permeability combined with the oscillating tidal forces provide the basis for a pumping mechanism in porous rocks. Numerical simulations of the interaction between tidal strain and fluid pore pressure show a residual flow beside fluid oscillations for the simplified model of a u‐shaped fault system. The magnitude of the residual flow is dependent on the permeability and the scale of the area considered. A residual Darcy velocity of 4·10 −14 m/s was calculated with KTB permeabilities.