Topic
Permeability (earth sciences)
About: Permeability (earth sciences) is a research topic. Over the lifetime, 15424 publications have been published within this topic receiving 288535 citations.
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Abstract: This paper describes a series of experiments designed to investigate the influence of lithology on the compactional loss of porosity and permeability in mudstones. Two intact samples of London Clay with clay fractions of 40% and 67% were compacted to 33 MPa effective stress. Clay fraction, permeability, porosity, pore size distribution, and specific surface area were measured and their evolution was monitored throughout the compaction process. Electron microscopy was combined with mercury porosimetry to trace the collapse of the pore structure with increasing effective stress. In both cases, porosity loss occurred primarily by the collapse of large pores. This process is more obvious in the coarser-grained sample because throughout the compaction process it has a much broader range of pore radii and a much greater mean pore radius. Consistent with the pore size distributions, the permeability of the coarser sample ranges from ∼ 10−10 m s−1 to 10−12 m s−1 while that of the finer-grained sample ranges from ∼4 × 10−12 m s−1 to 5 × 10−14 m s−1 during progressive compaction from 2 to 33 MPa. The compressibility of the finer-grained sample is greater than that of the coarser-grained sample (0.15 as opposed to 0.07). However, in both cases the compressibility is much lower than that inferred for lithologically similar samples compacted over geological timescales. The demonstration that both porosity and lithology (clay fraction) influence the permeability of mudstones should allow the development of more realistic porosity-permeability relationships which take into account lithological variations exhibited by mudstones.
239 citations
TL;DR: In this paper, a low-pressure water permeability test was used to generate width-controlled cracks, and the results indicated that the relationship between permeability and material type differ for uncracked and cracked material, and there was little thickness effect.
Abstract: The goal of the research presented here was to study the relationship between cracking and water permeability. A feedback-controlled test was used to generate width-controlled cracks. Water permeability was evaluated by a low-pressure water permeability test. The factors chosen for the experimental design were material type (paste, mortar, normal and high strength concrete), thickness of the sample and average width of the induced cracks (ranging from 50 to 350 micrometers). The water permeability test results indicated that the relationships between permeability and material type differ for uncracked and cracked material, and that there was little thickness effect. Permeability of uncracked material decreased from paste, mortar, normal strength concrete (NSC) to high strength concrete (HSC). Water permeability of cracked material significantly increased with increasing crack width. For cracks above 100 microns, NSC showed the highest permeability coefficient, where as mortar showed the lowest one.
237 citations
01 Jan 2006
TL;DR: In this paper, Ho et al. present a model for the continuous model of gas flow in Porous Media, which is based on the Lattice Boltzmann Method for Calculating Fluid Flow and Dispersion.
Abstract: Table of Contents 1. Introduction C.K. Ho and S.W. Webb Part 1: Processes and Models 2. Gas Transport Mechanisms S.W. Webb 3. Vapor Transport Processes C.K. Ho 4. Solid/Gas Partitioning S.K. Ong 5. Two-Phase Gas Transport S.W. Webb 6. Conservation Equations S. Whitaker 7. Gas-Phase Dispersion in Porous Media M.S. Costanza-Robinson and M.L. Brusseau 8. Gas Injection and Fingering in Porous Media M. Sahimi, M. Reza Rasaei, and M. Haghighi 9. Unstable and Fingering Gas Flow in Fractures P. Persoff 10. Natural Convection Gas Transport in Porous Media K. Khanafer and K. Vafai 11. Scaling Issues in Porous and Fractured Media V.C. Tidwell 12. Numerical Codes for Continuum Modeling of Gas Transport in Porous Media K. Pruess 13. Lattice Boltzmann Method for Calculating Fluid Flow and Dispersion in Porous and Fractured Media H.W. Stockman Part 2: Measurement and Monitoring 14. Experimental Determination of Transport Parameters O. Solcova and P. Schneider 15. Air Permeability Measurements in Porous Media V.C. Tidwell 16. Analyzing Barometric Pumping to Characterize Subsurface Permeability J. Rossabi 17. Subsurface Flow Measurements J. Rossabi 18. Measurement of Vapor Concentrations C.K. Ho, M. Kelly and M.T. Itamura 19. In-Situ Measurement of InducedContaminant Flux A. Tartre Part 3: Applications 20. Radon Transport B.W. Arnold 21. Gas Transport Issues in Landmine Detection J. Phelan 22. Environmental Remediation of Volatile Organic Compounds R. Falta 23. Yucca Mountain Heater Tests Y.Y.W. Chang 24. Impact of Gas Generation on the Performance of the Waste Isolation Pilot Plant P. Vaughn 25. Oil and Gas Industry Applications of Gas Flow in Porous Media D.J. Borns 26. Geological Carbon Sequestration: CO2 Transport in Depleted Gas Reservoirs C.M. Oldenburg 27. Industrial Gas Transport Processes Involving Heat Transfer O.A. Plumb Index
235 citations
TL;DR: In this article, the porosity and physical features of the pore network were characterized using Electrical Impedance Spectroscopy (EIS), which was found to be an inaccurate indicator of the electrical conductivity of the sample.
234 citations
TL;DR: In this paper, two sets of experiments on typical Class G well cement were carried out in the laboratory to understand better the potential processes involved in well leakage in the presence of CO2.
232 citations