Linking Particle and Pore Size Distribution Parameters to Soil Gas Transport Properties

2012 ◽  
Vol 76 (1) ◽  
pp. 18-27 ◽  
Author(s):  
Emmanuel Arthur ◽  
Per Moldrup ◽  
Per Schjønning ◽  
Lis W. Jonge
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Transport Properties ◽  
Size Distribution ◽  
Gas Transport ◽  
Soil Gas ◽  
Gas Transport Properties ◽  
Distribution Parameters

NANOSCALE PORE SIZE DISTRIBUTION EFFECTS ON GAS PRODUCTION FROM FRACTAL SHALE ROCKS

Fractals ◽  
2019 ◽  
Vol 27 (08) ◽  
pp. 1950142
Author(s):  
JINZE XU ◽  
KELIU WU ◽  
RAN LI ◽  
ZANDONG LI ◽  
JING LI ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Gas Transport ◽  
Gas Production ◽  
Lower Sensitivity ◽  
Apparent Permeability ◽  
Transport Efficiency ◽  
Nanoscale Pore

Effect of nanoscale pore size distribution (PSD) on shale gas production is one of the challenges to be addressed by the industry. An improved approach to study multi-scale real gas transport in fractal shale rocks is proposed to bridge nanoscale PSD and gas filed production. This approach is well validated with field tests. Results indicate the gas production is underestimated without considering a nanoscale PSD. A PSD with a larger fractal dimension in pore size and variance yields a higher fraction of large pores; this leads to a better gas transport capacity; this is owing to a higher free gas transport ratio. A PSD with a smaller fractal dimension yields a lower cumulative gas production; this is because a smaller fractal dimension results in the reduction of gas transport efficiency. With an increase in the fractal dimension in pore size and variance, an apparent permeability-shifting effect is less obvious, and the sensitivity of this effect to a nanoscale PSD is also impaired. Higher fractal dimensions and variances result in higher cumulative gas production and a lower sensitivity of gas production to a nanoscale PSD, which is due to a better gas transport efficiency. The shale apparent permeability-shifting effect to nanoscale is more sensitive to a nanoscale PSD under a higher initial reservoir pressure, which makes gas production more sensitive to a nanoscale PSD. The findings of this study can help to better understand the influence of a nanoscale PSD on gas flow capacity and gas production.

Dissolution and precipitation reactions during acidic fluid percolation through different limestone samples

2020 ◽  
Author(s):  
Linda Luquot
Keyword(s):  
Diffusion Coefficient ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Transport Properties ◽  
Size Distribution ◽  
High Capacity ◽  
Co2 Injection ◽  
Geometrical Parameters ◽  
Calcite Dissolution ◽  
Geological Formation

<p>CO2 sequestration in deep geological formation is considered an option to reduce CO2 emissions in the atmosphere. After injection, the CO2 will slowly dissolve into the pore water producing low pH fluids with a high capacity for dissolving carbonates. Limestone rock dissolution induces geometrical parameters changes such as porosity, pore size distribution, or tortuosity which may consequently modify transport properties (permeability, diffusion coefficient). Characterizing these changes is essential for modelling flow and CO2 transport during and after the CO2 injection. Indeed, these changes can affect the storage capacity and injectivity of the formation.</p><p>Very few published studies evaluate the transport properties changes (porosity, permeability, pore size distribution, diffusion coefficient) due to fluid-rock interactions (dissolution and/or precipitation).</p><p>Here we report experimental results from the injection of acidic fluids (some of them equilibrated with gypsum) into limestone core samples of 25.4 mm diameter and around 25 mm length. We studied two different limestone samples: one composed of 73% of calcite and 27% of quartz, and the second one of 100% of dolomite. Experiments were realized at room temperature. Before and after each acidic rock attack, we measure the sample porosity, the diffusion coefficient and the pore size distribution.</p><p>We also imaged the 3D pore network by X-ray microtomography to evaluate the same parameters. During percolation experiments, the permeability changes are recorded and chemical samples taken to evaluate calcite dissolution and gypsum precipitation. Several dissolution/precipitation-characterization cycles are performed on each sample in order to study the evolution and relation of the different parameters.</p><p>These experiments show different dissolution regimes depending of the fluid acidity and of the</p><p>limestone samples in particular the initial local heterogeneity, and pore size distribution.</p>

Persistent effects of subsoil compaction on pore size distribution and gas transport in a loamy soil

2012 ◽  
Vol 122 ◽  
pp. 42-51 ◽  
Author(s):  
F.E. Berisso ◽  
P. Schjønning ◽  
T. Keller ◽  
M. Lamandé ◽  
A. Etana ◽  
...  
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Gas Transport ◽  
Loamy Soil ◽  
Subsoil Compaction

scholarly journals PORE SIZE DISTRIBUTION IN SIMULATION OF MASS TRANSPORT IN POROUS MEDIA: A CASE STUDY IN RESERVOIR ANALYSIS

2018 ◽  
Vol 56 (2A) ◽  
pp. 24-30
Author(s):  
Vu Hong Thai
Keyword(s):  
Porous Media ◽  
Mass Transport ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Transport Properties ◽  
Size Distribution ◽  
Control Volume ◽  
Mass Conservation ◽  
Absolute Permeability ◽  
Transport In Porous Media

The modeling and numerical simulation of mass transport in porous media is discussed in this work by using the so-called pore size distribution for computing transport properties. The pore-size distribution is a property of the pore structure of a porous medium. This can be used to estimate the different transport properties, amongst other, the permeability. By starting with a formula for the absolute permeability, the simulation of water and oil transport in reservoirs is considered by solving mass conservation equations with the help of the control volume method. The influence of the pore size distribution on the transport behavior is discussed to demonstrate the adequacy of the use of pore size distribution in studying the behavior of reservoirs.

scholarly journals The influence of soil gas transport properties on methane oxidation in a selection of northern European soils

1997 ◽  
Vol 102 (D19) ◽  
pp. 23309-23317 ◽  
Author(s):  
B. C. Ball ◽  
K. A. Smith ◽  
L. Klemedtsson ◽  
R. Brumme ◽  
B. K. Sitaula ◽  
...  
Keyword(s):  
Transport Properties ◽  
Methane Oxidation ◽  
Gas Transport ◽  
Soil Gas ◽  
Northern European ◽  
Gas Transport Properties ◽  
Selection Of
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