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Crystals
Special Issues
Current Advances in Fracture Characteristics of Shale
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Current Advances in Fracture Characteristics of Shale

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Mineralogical Crystallography and Biomineralization".

Deadline for manuscript submissions: closed (31 December 2021)

Special Issue Editors

Prof. Dr. Yong Li

E-Mail Website
Guest Editor
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Interests: mechanical properties of rock, especially the fractural mechanism and the criteria of laid rock; numerical simulation methods such as the finite element method and extended finite element method for fracture mechanics
Dr. Yingfang Zhou

E-Mail Website
Guest Editor
School of Engineering, University of Aberdeen, Aberdeen AB24 3FX, UK
Interests: digital rock physics; CO2 geological storage and utilization; multiscale porous material characterization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The dramatically increasing fuel demand and the decrease in conventional energy resources have applied great pressure on energy supplies. As a relatively cleaner energy resource compared to other hydrocarbon resources, shale gas is a realistic option for energy consumption and has become especially important in the global unconventional oil and gas exploration and development.

The primary challenge in the exploitation of shale gas is that the physical and mechanical behaviors of its storage medium, i.e., shale, with its characteristics of low permeability and multilevel anisotropy, are not well understood. Therefore, further research on the physical and mechanical properties of shale, particularly the macroscopic and mesoscopic fracture mechanism of shale, is of practical significance for applying hydraulic fracturing in the exploration and exploitation of shale gas. To provide the necessary bridge into the newer processes, approaches, and designs to help to increase the production rates of shale gas and maximize its unconventional potential, this Special Issue, entitled “Current Advances in Fracture Characteristics of Shale”, will cover original research and studies related to the abovementioned topics, including:

- Macroscopic and mesoscopic structural characteristics of shale;

- Analysis of physical and mechanical properties of shale based on mineralogical crystallography;

- Relationship between microstructure of shale and its macroscopic physicomechanical characteristics;

- Microscopic fracture mechanism of shale under multiple physicochemical fields;

- Mechanics and essential properties of shale reservoirs;

- Fundamental and practical aspects of exploration and exploitation of shale gas;

- Constitutive model of shale and its application;

- Fracture behaviors of shale and its fracture initiation, propagation mechanism;

- Mechanisms of hydraulic fracturing in shale reservoirs;

- Mechanical properties of shale under dynamic loading.

Papers selected for this Special Collection are subject to a rigorous peer-review procedure with the aim of rapid and wide dissemination of research results, development, and applications.

We welcome you to submit your work to this Special Collection, and we are looking forward to receiving your outstanding research.

Prof. Dr. Yong Li
Dr. Yingfang Zhou
Guest Editors

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. Crystals 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 2600 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

  • Macroscopic and mesoscopic structural characteristics
  • Mineralogical crystallography
  • Microscopic fracture mechanism
  • Shale reservoirs
  • Mechanics and essential properties of shale reservoirs
  • Constitutive model of shale
  • Fracture behaviors of shale
  • Mechanisms of hydraulic fracturing in shale reservoirs
  • Fracture criterion of layered rock
  • Numerical simulation of hydraulic fracturing in shale reservoirs

Published Papers (2 papers)

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Research

13 pages, 4845 KiB  
Article
The Influence of Lamina Density and Occurrence on the Permeability of Lamellar Shale after Hydration
by Pengfei Zhao, Xingxing Wang, Xiangyu Fan, Xingzhi Wang, Feitao Zeng, Mingming Zhang, Fan Meng and Wen Nie
Crystals 2021, 11(12), 1524; https://doi.org/10.3390/cryst11121524 - 7 Dec 2021
Cited by 3 | Viewed by 2254
Abstract
The characteristics of laminae in lamellar shale oil reservoirs have important influences on reservoir parameters, especially permeability. In order to explore the influence of lamina density and occurrence on the permeability of lamellar shale after hydration, we studied the lamellar shale in the [...] Read more.
The characteristics of laminae in lamellar shale oil reservoirs have important influences on reservoir parameters, especially permeability. In order to explore the influence of lamina density and occurrence on the permeability of lamellar shale after hydration, we studied the lamellar shale in the Chang 7 member of the Yanchang Formation of Triassic in Ordos Basin. By comparing the permeability of bedding shale and lamellar shale with different densities of laminae, it was found that the permeability anisotropy of lamellar shale was stronger. In the direction parallel to the lamina, the permeability increased approximately linearly with an increase in lamina density. The effect of hydration on rock micropore structure and permeability was studied by soaking shale in different fluids. Most of the microfracture in the lamellar shale was parallel to the lamina direction, and hydration led to a widening of the microfracture, which led to the most obvious increase in permeability parallel to the lamina. Collectively, the research results proved that lamina density, occurrence, and hydration have a significant influence on the permeability anisotropy of lamellar shale. Full article
(This article belongs to the Special Issue Current Advances in Fracture Characteristics of Shale)
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15 pages, 6285 KiB  
Article
Fluid Flow Behavior of Sheared Rough Fractures Subjected to Different Stress State
by Min Wang, Qifeng Guo, Pengfei Shan, Yakun Tian and Bing Dai
Crystals 2021, 11(9), 1055; https://doi.org/10.3390/cryst11091055 - 1 Sep 2021
Cited by 2 | Viewed by 1774
Abstract
The hydraulic properties of fractures are greatly affected by the stress. Knowing the fluid flow behavior of fractures is of great importance to underground engineering construction and environmental safety. The main purpose of this paper is to study the fluid flow characteristics of [...] Read more.
The hydraulic properties of fractures are greatly affected by the stress. Knowing the fluid flow behavior of fractures is of great importance to underground engineering construction and environmental safety. The main purpose of this paper is to study the fluid flow characteristics of rough fractures under different stress states. First, rough fracture surfaces were generated by using the corrected successive random addition (SRA) algorithm. Then, the sheared fracture models subjected to different stress condition were obtained under the boundary condition of constant normal stiffness (CNS). Finally, the hydraulic characteristics of the three-dimensional rough rock fractures were analyzed by numerically solving the full Navier–Stokes equation. It has been found that (1) the aperture of fractures all obeys the Gaussian distribution. The dilatancy effect is gradually obvious and aperture becomes larger with the increase of shear displacement. (2) When the initial normal stress increases, the contact area of fracture becomes larger and the reverse flow can be observed around the contact area. (3) The relationship between hydraulic gradient and flowrate exhibits nonlinearity which can be described by the Forchheimer’s law. The linear coefficient a and the nonlinear coefficient b gradually decrease with the increase of shear displacement and finally stabilize. The values of a and b are reduced by 1–2 and 1–3 orders of magnitude respectively during the shear. The critical Reynolds number increases with the increase of shear displacement and decrease as the initial normal stress increases. Full article
(This article belongs to the Special Issue Current Advances in Fracture Characteristics of Shale)
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