Savonnières limestone is a mono-mineralic, calcitic, layered oolithic limestone belonging to the Oolithe Vacuolaire (France). Its pore structure contains 4 types of porosity: inter-granular and intra-oolithic microporosity, and inter- granular and micro-connected macroporosity (hollow ooliths). The hollow ooliths are only connected to the other macro-pores by microporosity in the oolith-shells. Depending on local variations, the permeability ranges from 115 mD to more than 2000 mD (based on TinyPerm mini-permeameter measurements), and porosity ranges from 22%...
Downscaling-based segmentation for unresolved images of highly heterogeneous granular porous samplesIlenia Battiato Svyatoslav Korneev
We propose a simple and efficient algorithm of downscaling followed by segmentation to reconstruct the unresolved pore space from X-ray computed tomography (XCT) images of natural geological porous media columns. Contrary to widely employed single and multilevel threshold-based segmentation, the proposed method is based on a continuous map between pixel intensity and local pixel porosity that does not rely on the definition of arbitrary thresholds. The approach is used to generate a high-resolution binary image...
2D fractional-wet medium including oil-wet and water-wet portions. The medium is meshed using COMSOL. The mesh file is converted to the OpenFOAM format using an in-house package. The attached file contains "constant" and "system" folders and the case can be easily customized for CFD-based studies using OpenFOAM.
Two-fluid phase configurations in a periodic random close packing of spheres with porosity 0.369. This data set contains equilibrium fluid configurations obtained using the lattice Boltzmann method based on randomly initialized distribution of phases for a variety of fluid saturations. Data sets are labeled with the initial fluid saturation (sw_XX) and the whether a connected (a) wetting phase or (b) non-wetting phase was used to determine the initial fluid configuration. For additional details on the...
This project includes porosity images and steady-state water saturation images at 8 different positions (distance from inlet are 4, 12, 20, 28, 37, 44, 52 and 59 cm) along a 60-cm long Berea sandstone core (45 mD) during three primary drainage experiments conducted at 40C & 12 MPa, 40C & 8.3 MPa, and 60C & 12 MPa. The drainage experiment starts with injecting 1:1 volume ratio of CO2 and brine. After steady state is reached,...
This project includes high resolution images of three hydrate growth experiments. Data are from an accepted paper by Xiongyu Chen and D. Nicolas Espinoza published in Fuel in 2018, titled "Ostwald Ripening Changes the Pore Habit and Spatial Variability of Clathrate Hydrate" Exp1: Xenon hydrate growth inside an aluminum vessel half filled with pure water and half filled with xenon gas. T= 23 C, P_initial = 2.84 MPa. The image stack is taken with X-ray...
This dataset contains final texturally equilibrated pore structures using level set method. For more info see related publications.
This dataset was used in the study of Van Offenwert et al. (2019). It contains time-resolved laboratory-based micro-CT images of saturated solute injection experiments in sintered glass and Bentheimer sandstone. Based on the grey values in the resolved pore space, pore-scale concentration fields can be quantified. To estimate its uncertainty, calibration scans where the pores were saturated with a known tracer (CsCl) concentration were performed at 12 s per scan with a voxel size of...
2D bead-packs (0.6 m x 0.6 m x 0.02 m) were generated with realistic geological features (cross-stratification and ripple lamination). To demonstrate an application of the technique, gravity unstable multiphase flow experiments were conducted in the generated bead-packs. This project contains time-lapse videos of these flow experiments.
This project is part of a Guelph dolomite (GD) petrophysical characterization study. Multi-scale CT scans are conducted on a GD core (30 mm x 75 mm) at a resolution of 23 um. Medical CT (low resolution - 250 microns), permeability and NMR study are also done on the sample. Digital sub-sample is created and vug have been segmented. Vug characterization is attempted by using the surface to volume ratio to determine the vug shape and...
Mancos shale samples scanned pre and post-triaxial testing. Triaxial testing at various stress loading paths and confining pressures ranging from 100 to 500 psi. Three types of samples (Perpendicular Bedding- PD_ , Directional Bedding- 45_ , Parallel Bedding- PL_) Videos of fracture network visualization using Fiji/Image-J post-triaxial testing can be found here: https://www.youtube.com/playlist?list=PLv0npDbE5HXvEdptgajRDG3x-lwmtGDbr X-ray power ranging from 16.9 to 30.3 W. Copper filters used with thicknesses varying from 0 to 0.25 mm. Exact voltage and...
This project includes high resolution micro-CT images of one xenon hydrate growth experiment in sand. Data are from a paper by Xiongyu Chen, Rahul Verma, D. Nicolas Espinoza and Masa Prodanovic, published in Water Resources Research in 2018, titled "Pore-Scale Determination of Gas Relative Permeability in Hydrate-Bearing Sediments Using X-Ray Computed Micro-Tomography and Lattice Boltzmann Method" Conditions for xenon hydrate growth in sand: T=23C, P_initial =3.72 MPa. Aqueous phase is 10wt% NaBr brine. The image...
Medical CT scans of Guelph dolomite for fracture characterization. The core was imaged in Department of Petroleum and Geosystems Engineering, UT Austin.
Microtomography image of a fracture from Niobrara formation, CO, USA (tight carbonate).
Imperial College London4
The University of Texas at Austin3
Carl Zeiss Foundation2
Southern Methodist University2
University of Illinois at Urbana Champaign2
Los Alamos National Laboratory1
National Energy Technology Laboratory1
Federal University of Rio de Janeiro1
China University of Petroleum1