3D Confocal Imaging Methodology Optimized for Pore Space Characterization of Microporous Carbonate Reservoirs

2020 ◽  
Author(s):  
A. Hassan ◽  
V. Chandra ◽  
M. P. Yutkin ◽  
T. W. Patzek
Keyword(s):  
Pore Space ◽  
Confocal Imaging ◽  
Carbonate Reservoirs ◽  
Imaging Methodology ◽  
Space Characterization

Physical Rock Matrix Characterization: Structural and Mineralogical Heterogeneities in Granite

2008 ◽  
Vol 1124 ◽  
Author(s):  
Mikko Voutilainen ◽  
Suvi Lamminmäki ◽  
Jussi Timonen ◽  
Marja Siitari-kauppi ◽  
Daniel Breitner
Keyword(s):  
Pore Space ◽  
3D Structure ◽  
Rock Matrix ◽  
X Ray ◽  
Small Pore ◽  
Waste Repositories ◽  
Granite Samples ◽  
Space Characterization ◽  
Physical Rock

AbstractEvaluation of the transport and retardation properties of rock matrices that serve as host rock for nuclear waste repositories necessitates their thorough pore-space characterization. Relevant properties to be quantified include the diffusion depth and volume adjacent to water conducting features. The bulk values of these quantities are not sufficient due to the heterogeneity of mineral structure on the scale of the expected transport/interaction distances. In this work the 3D pore structure of altered granite samples with porosities of 5 to 15%, taken next to water conducting fractures at 180 200 m depth in Sievi, Finland, was studied. Characterization of diffusion pathways and porosity were based on quantitative autoradiography of rock sections impregnated with C14-labelled polymethylmethacrylate (PMMA). Construction of 3D structure from PMMA autoradiographs was tested. The PMMA method was augmented by field emission scanning electron microscopy and energy-dispersive X-ray analyses (FESEM/EDAX) in order to study small pore-aperture regions in more detail and to identify the corresponding minerals. The 3D distribution of minerals and their abundances were determined by X-ray microtomography. Combining the mineral specific porosity found by the PMMA method with these distributions provided us with a 3D porosity distribution in the rock matrix.

scholarly journals Pore-space characterization of an altered tonalite by X-ray computed microtomography and the14C-labeled-polymethylmethacrylate method

2012 ◽  
Vol 117 (B1) ◽  
pp. n/a-n/a ◽  
Author(s):  
M. Voutilainen ◽  
M. Siitari-Kauppi ◽  
P. Sardini ◽  
A. Lindberg ◽  
J. Timonen
Keyword(s):  
Pore Space ◽  
X Ray ◽  
Computed Microtomography ◽  
X Ray Computed ◽  
Space Characterization

Micro-X-ray Computed Tomography (μXRCT) Pore Space Characterization of Carbonate Samples

2017 ◽  
Author(s):  
Megan M. Smith ◽  
Susan A. Carroll ◽  
Amber Connor
Keyword(s):  
Computed Tomography ◽  
Pore Space ◽  
X Ray ◽  
X Ray Computed ◽  
Space Characterization

scholarly journals Vapor space characterization of waste tank 241-C-101: Results from samples collected on 9/1/94

1995 ◽  
Author(s):  
R.B. Lucke ◽  
T.W. Clauss ◽  
M.W. Ligotke
Keyword(s):  
Space Characterization ◽  
Vapor Space

scholarly journals Vapor space characterization of waste tank 241-C-106: Results from samples collected on February 15, 1994

1995 ◽  
Author(s):  
B.D. McVeety ◽  
T.W. Clauss ◽  
J.S. Young ◽  
M.W. Ligotke ◽  
S.C. Goheen ◽  
...  
Keyword(s):  
Space Characterization ◽  
Vapor Space

The Effect of Capillary Condensation on the Geomechanical and Acoustic Properties of Tight Formations: An Experimental Study

2021 ◽  
Author(s):  
Aamer Albannay ◽  
Binh Bui ◽  
Daisuke Katsuki
Keyword(s):  
Pore Pressure ◽  
Capillary Condensation ◽  
Pore Space ◽  
Dew Point ◽  
Acoustic Properties ◽  
Point Pressure ◽  
Tight Formations ◽  
Dew Point Pressure ◽  
Compressional Velocity

Abstract Capillary condensation is the condensation of the gas inside nano-pore space at a pressure lower than the bulk dew point pressure as the result of multilayer adsorption due to the high capillary pressure inside the small pore throat of unconventional rocks. The condensation of liquid in nano-pore space of rock changes its mechanical and acoustic properties. Acoustic properties variation due to capillary condensation provides us a tool to monitor phase change in reservoir as a result of nano-confinement as well as mapping the area where phase change occurs as well as characterize pore size distribution. This is particularly important for tight formations where confinement has a strong effect on phase behavior that is challenging to measure experimentally. Theoretical studies have examined the effects of capillary condensation; however, these findings have not been verified experimentally. The main objective of this study is to experimentally investigate the effect of capillary condensation on the mechanical and acoustic properties of shale samples. The mechanical and acoustic characterization of the samples was carried out experimentally using a state-of-the-art tri-axial facility at the Colorado School of Mines. The experimental set-up is capable of the simultaneous acquisition of coupled stress, strain, resistivity, acoustic and flow data. Carbon dioxide was used as the pore pressure fluid in these experiments. After a comprehensive characterization of shale samples, experiments were conducted by increasing the pore pressure until condensation occurs while monitoring the mechanical and acoustic properties of the sample to quantify the effect of capillary condensation on the mechanical and acoustic properties of the sample. Experimental data show a 5% increase in Young's Modulus as condensation occurs. This increase is attributed to the increase in pore stiffness as condensation occurs reinforcing the grain contact. An initial decrease in compressional velocity was observed as pore pressure increases before condensation occurs which is attributed to the expansion of the pore volume when pore pressure increases. After this initial decrease, compressional velocity slightly increases at a pressure around 750 - 800 psi which is close to the condensation pressure. We also observed a noticeable increase in shear velocity when capillary condensation occurs, this could be due to the immobility of the condensed liquid phase at the pore throats. The changes of geomechanical and acoustic signatures were observed at around 750 - 800 psi at 27°C, which is the dew point pressure of the fluid in the nano-pore space of the sample at this temperature. While the unconfined bulk dew point pressure of carbon dioxide at the same temperature is 977 psi. Hence, this study marks the first measurement of the dew point of fluid in nano-pore space and potentially leads to the construction of the phase envelope of fluid under confinement.

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