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5.2
2.7
Journals
Geosciences
Special Issues
Micromechanics of Reservoir and Cap Rocks
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Micromechanics of Reservoir and Cap Rocks

A special issue of Geosciences (ISSN 2076-3263).

Deadline for manuscript submissions: closed (31 May 2019)

Special Issue Editor

Dr. Alexandre Dimanov

E-Mail Website
Guest Editor
Laboratoire de Mecanique des Solides Ecole Polytechnique, Palaiseau, France
Interests: rheology; polyphase/polycrystal micro mechanics; homogenization; crystal plasticity; grain boundary sliding; solution-precipitation; in situ mechanical testing; full mechancal field measurements; digital image correlation

Special Issue Information

Dear Colleagues,

Micromechanics of cap and reservoir rocks is a Special Issue of Geosciences intending to highlight recent fundamental and applied research on the micromechanical behaviour of major  reservoir rocks as carbonates and their usual cap rocks as shales and halite. The latter are the most important rocks for oil and green energy industries.

Besides for oil production, understanding the mechanical behaviour of carbonates, shales and halite rocks is of fundamental importance for geotechnical applications concerned with underground energy storage in depleted reservoir rocks, or in solution mined caverns. The latter includes both the classical storage of hydrocarbon, but also new perspectives for sustainable development, based on storage of hydrogen or compressed air energy. Aditionnaly, rock salt mines and shales are still envisaged for nuclear waste repositories. Depleted carbonate reservoirs and salt caverns are also potential candidates for CO2 sequestration.

In this Special Issue we put forward the micromechanical aspects of these materials because they are the key for understanding the macroscopic mechanical and petrophysical properties, which depend on the inherent microstructural heterogeneities.

In summary, I would like to invite you to submit your recent theoretical or experimental research, or natural case studies of carbonates, shales or halite, with respect to the micromechanical aspects and deformation mechanisms and related microstructural evolution. For instance, we encourage in situ characterization techniques and numerical modeling of multiphysic couplings and fluid-rock interactions.

Dr. Alexandre Dimanov

Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Geosciences is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Defect microstructures
  • Crystal/polycrystal plasticity
  • Localization
  • Dynamic recrystallization
  • Grain boundary migration
  • Solution creep
  • Interfacial mass transfer
  • Grain boundary sliding
  • Interfacial cavitation
  • Microdamage
  • In situ micromechanical tests
  • Elasto visco plastic modelling
  • Full field measurements

Published Papers (2 papers)

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Research

28 pages, 2895 KiB  
Article
Finite Element Simulations of an Elasto-Viscoplastic Model for Clay
by Mohammad N. Islam, Carthigesu T. Gnanendran and Mehrdad Massoudi
Geosciences 2019, 9(3), 145; https://doi.org/10.3390/geosciences9030145 - 26 Mar 2019
Cited by 5 | Viewed by 4173
Abstract
In this paper, we develop an elasto-viscoplastic (EVP) model for clay using the non-associated flow rule. This is accomplished by using a modified form of the Perzyna’s overstressed EVP theory, the critical state soil mechanics, and the multi-surface theory. The new model includes [...] Read more.
In this paper, we develop an elasto-viscoplastic (EVP) model for clay using the non-associated flow rule. This is accomplished by using a modified form of the Perzyna’s overstressed EVP theory, the critical state soil mechanics, and the multi-surface theory. The new model includes six parameters, five of which are identical to those in the critical state soil mechanics model. The other parameter is the generalized nonlinear secondary compression index. The EVP model was implemented in a nonlinear coupled consolidated code using a finite-element numerical algorithm (AFENA). We then tested the model for different clays, such as the Osaka clay, the San Francisco Bay Mud clay, the Kaolin clay, and the Hong Kong Marine Deposit clay. The numerical results show good agreement with the experimental data. Full article
(This article belongs to the Special Issue Micromechanics of Reservoir and Cap Rocks)
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12 pages, 3921 KiB  
Article
Nanoindentation Studies of Plasticity and Dislocation Creep in Halite
by Christopher A. Thom and David L. Goldsby
Geosciences 2019, 9(2), 79; https://doi.org/10.3390/geosciences9020079 - 6 Feb 2019
Cited by 14 | Viewed by 3612
Abstract
Previous deformation experiments on halite have collectively explored different creep mechanisms, including dislocation creep and pressure solution. Here, we use an alternative to conventional uniaxial or triaxial deformation experiments—nanoindentation tests—to measure the hardness and creep behavior of single crystals of halite at room [...] Read more.
Previous deformation experiments on halite have collectively explored different creep mechanisms, including dislocation creep and pressure solution. Here, we use an alternative to conventional uniaxial or triaxial deformation experiments—nanoindentation tests—to measure the hardness and creep behavior of single crystals of halite at room temperature. The hardness tests reveal two key phenomena: (1) strain rate-dependent hardness characterized by a value of the stress exponent of ~25, and (2) an indentation size effect, whereby hardness decreases with increasing size of the indents. Indentation creep tests were performed for hold times ranging from 3600 to 106 s, with a constant load of 100 mN. For hold times longer than 3 × 104 s, a transition from plasticity to power-law creep is observed as the stress decreases during the hold, with the latter characterized by a value of the stress exponent of 4.87 ± 0.91. An existing theoretical analysis allows us to directly compare our indentation creep data with dislocation creep flow laws for halite derived from triaxial experiments on polycrystalline samples. Using this analysis, we show an excellent agreement between our data and the flow laws, with the strain rate at a given stress varying by less than 5% for a commonly used flow law. Our results underscore the utility of using nanoindentation as an alternative to more conventional methods to measure the creep behavior of geological materials. Full article
(This article belongs to the Special Issue Micromechanics of Reservoir and Cap Rocks)
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