Solid-fluid interactions in porous media : processes that form rocks

Aharonov, Einat

doi:10.1575/1912/5723

Cited by 2 publications

(5 citation statements)

References 67 publications

(174 reference statements)

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“…In good agreement with previous studies (Ortoleva, 1994, Aharonov, 1996, dissolution was found to lead to heterogeneous pore structures, characterized by "worm holes". These structures are strongly anisotropic with enhanced permeability in the macroscopic flow direction (the formation of "worm holes" leads to serious technical problems in applications such as acid stimulation of oil reservoirs).…”

Section: Discussionsupporting

confidence: 92%

“…An anisotropic, approximately layered structure was obtained, with an alternance of high permeability zones and barriers perpendicularly to the macroscopic flow. This is consistent with field observations and simulation results (Jeannette and $izun, personal communication, Ortoleva, 1994, Aharonov, 1996. A striking finding was that precipitation smoothed the flux field (similar conclusions were reached by Aharonov [1996] using a macroscopic approach), creating a strong correlation of the pressure gradient field to the resistance field.…”

Section: Discussionsupporting

confidence: 87%

“…This is consistent with field observations and simulation results (Jeannette and $izun, personal communication, Ortoleva, 1994, Aharonov, 1996. A striking finding was that precipitation smoothed the flux field (similar conclusions were reached by Aharonov [1996] using a macroscopic approach), creating a strong correlation of the pressure gradient field to the resistance field. It can be concluded that it's the flow pattern, not the pore structure, which became self-organized.…”

Section: Discussionsupporting

confidence: 87%

“…large Damk0hler and P6clet numbers). Note, however, that these conditions may not apply in many natural situations (Fisher and Brantley, 1992, Ortoleva, 1994, Aharonov, 1996 Accordingly, an incremental numerical procedure was followed.…”

Section: Complexities Such As Different Pore Shapes or Empty Bondsmentioning

confidence: 99%

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Self‐organized fluid flow through heterogeneous networks

Bernabé¹

1996

Geophysical Research Letters

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The purpose of this paper is to assess the coupled effect of fluid flow and dissolution/precipitation reactions in heterogeneous porous media at semi‐macroscopic scales (i.e. several tens of grains). Are the dissolution/precipitation processes roughening or smoothing at these scales? Does self‐organization arise from the coupling of these processes with fluid flow? What is the effect of heterogeneity (i.e. of the variance of the pore size distribution assuming a constant mean)? The dissolution/precipitation processes were modeled as producing a change of the local pore radius proportionally to the local flux. It was found that both precipitation and dissolution lead to more heterogeneous, anisotropic pore structures (parallel to the macroscopic flow for dissolution, perpendicular for precipitation). One new interesting observation was that precipitation generated an almost uniform flux field. To a lesser extent, dissolution also tended to smooth the pressure gradient field. The possibility of uniform flux or pressure gradient fields could have important implications in hydrology or in technical applications such as filter plugging or acid treatment of oil reservoirs.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 87%

Section: Complexities Such As Different Pore Shapes or Empty Bondsmentioning

confidence: 99%

See 2 more Smart Citations

Self‐organized fluid flow through heterogeneous networks

Bernabé¹

1996

Geophysical Research Letters

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“…A given porosity producing or reducing mechanism is said to be smoothing (roughening) if it reduces (augments) the heterogeneity of the pore space at any scale and thus decreases (increases) the ratio of noneffective to effective pore volume. By this definition the chemically driven mechanisms discussed here tend to be roughening at scales varying from subpore (i.e., pore wall roughness [Aharonov et al, 1997]) to macroscopic scales [Ortoleva, 1994;Aharonov, 1996;Bernabé, 1996].…”

Section: Discussionmentioning

confidence: 99%

Permeability, porosity and pore geometry of chemically altered porous silica glass

2002

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[1] In this study, we prepared samples of a well-controlled, internally smooth, synthetic material (i.e., porous silica glass) and submitted them to chemical alteration while measuring changes in porosity and permeability. In the early stages of alteration we observed a large drop in permeability, whereas porosity remained essentially unchanged. In the late stages the permeability decrease became gradual so that even small decreases in permeability were accompanied by substantial decreases in porosity, as has been observed previously in natural sandstones and shales. A detailed microstructure study showed that smooth pore walls were roughened during alteration. Furthermore, the pore space heterogeneity increased and the connectivity decreased. A simple conceptual model suggests that the alterations occur while fluids are flowing.

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Solid-fluid interactions in porous media : processes that form rocks

Cited by 2 publications

References 67 publications

Self‐organized fluid flow through heterogeneous networks

Self‐organized fluid flow through heterogeneous networks

Permeability, porosity and pore geometry of chemically altered porous silica glass

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