Permeability and percolational properties of sedimentary rock
Journal Article
·
· Journal of Engineering Physics and Thermophysics
OSTI ID:136126
- Leningrad Komsomol Tyumen Industrial Institute (Russian Federation)
Formulas for calculating the absolute and relative phase permeabilities of rock are obtained, taking account of the percolational properties of the pore space. The absolute and relative phase permeabilities are amount the most important characteristics of sedimentary rock, and are determined primarily by the structure of the pore space. Until recently, a simple model consisting of a bundle of parallel noninteracting capillaries was widely used to calculate the permeability. Considerable effort has been expended in trying to understand the factors responsible for the rock permeability and to eliminate the deficiencies of the simple capillary model. Percolation-theory concepts and methods, taking account of the coupling between different capillaries, have been of particular importance here. In the usual formulation of the percolation-theory problem for the description of processes occurring in rock, the pore space is represented as large pores (points) and thin channels (bonds connecting the pores). The permeability in this lattice is determined basically by the thin channels with decrease in their number, the interconnection of the pore space is disrupted and fluid filtration is impossible. In recent years, the idea that there is no closed porosity in collector rock (at least, in terrestrial rock). Hence it follows that, with any porosity values, there is an interconnected pore space through which the flow of various fluids is possible. Therefore, the filtrational properties must evidently be associated not with the geometric coupling of the pore space but with the coupling of the conducting pores. 24 refs., 3 figs.
- OSTI ID:
- 136126
- Journal Information:
- Journal of Engineering Physics and Thermophysics, Journal Name: Journal of Engineering Physics and Thermophysics Journal Issue: 4 Vol. 61; ISSN 1062-0125; ISSN JEPTER
- Country of Publication:
- United States
- Language:
- English
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