Scanning and transmission electron microscopy (SEM and TEM) are capable of characterising the morphology and structure of sub-micron size substances attached to chalk particle surfaces. Some characteristics, however, may originate from sample preparation or reflect interaction between sample and the electron beam.

Jul 1, 2017 · Original FIB-SEM investigation of three types of chalks including tight chalks. Quantification of pore sizes and pore shapes from 3D pore network. Evidence of the impact of clay-content and cementation on the pore properties. Accurate permeability estimation from Lattice Boltzmann Method.

Heterogeneous nature of chalk on the micrometer scale. Back scattered electron images of dry chalk (A), pores partially filled with oil (B) and completely filled (C).

Feb 1, 2021 · Using SEM analysis reveals that the major pore network in the Austin Chalk Group comprises interparticle nanopores between coccolith elements. Furthermore, micropetrography demonstrates that the major diagenetic feature lithifying the chalk is calcite cement overgrowths on coccolith elements.

Jun 1, 2013 · Seawater saturated chalk loses up to 55% of its strength. Combined wettability and seawater weakening reduces the strength of chalk by 75–80%. SEM imaging identified salt crystals mechanically weakening the chalk.

Jul 9, 2018 · This study provides the first application of mathematical morphology on SEM images to characterize microporosity (chalk). A preliminary image segmentation is necessary to separate porosity and grains. In chalk, the mid-point of the greyscale histogram gives image porosity values similar to He-porosity.

We use Gaussian Mixture Models to find the optimal separation of chalk (oolites) in backscatter scanning-electron microscopy images. Then we apply morphological filtering to smoothe out the edges in the notebook SEM Segmentation.ipynb

In accordance with the wave features in porous and fractured media, Lahcen and Pascale have investigated the hydrogeophysical characterization of a chalk aquifer in Beauvais, France (Zouhri and...

Accurate prediction of coupled geophysical and chemical processes at the pore scale requires realistic representation of pore structures. This is especially true for chalk materials, where pore networks are small and complex, and often characterized at sub-micron scale.

Download scientific diagram | SEM images showing surface morphology characteristics of chalk from publication: Investigation of particulate matter performances in relation to chalk selection...