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Applied Sciences
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Fractured Reservoirs 2021
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Fractured Reservoirs 2021

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: closed (20 May 2022) | Viewed by 3638

Special Issue Editor

Prof. Dr. Tivadar M. Tóth

E-Mail Website1 Website2
Guest Editor
Department of Mineralogy, Geochemistry and Petrology, University of Szeged, 6702 Szeged, Hungary
Interests: petrology; structural geology; numerical simulation of fractured fluid reservoirs
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Naturally fractured fluid reservoirs are of key importance in numerous fields of applied geology. At present, the largest part of the known hydrocarbon reserves is stored in these systems. Advanced geothermal energy utilization requires a fundamental understanding of fractured rock bodies. In addition, safe deposition of hazardous wastes, and mining of critical elements through the in situ leaching technique, among many others, use such rock bodies. Nevertheless, to adequately reveal the behavior of fractured reservoirs, petrological, structural geological, geomechanical, hydrodynamic, geophysical, etc. datasets should be evaluated simultaneously.

In this Special Issue, manuscripts involving such a complex approach are invited, whether concerned with case studies or methodological aspects.

Prof. Dr. Tivadar M. Tóth
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. Applied Sciences is an international peer-reviewed open access semimonthly 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 2400 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

  • microstructures
  • fracture network
  • modeling
  • compartmentalization
  • paleohydrology
  • fluid flow
  • vein cementation
  • rock mechanics
  • well log

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Published Papers (2 papers)

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Research

16 pages, 3515 KiB  
Article
Seepage Characteristics Study of Single Rough Fracture Based on Numerical Simulation
by Shidong Wang, Qing Zhang, Li Zhao, Yi Jin and Jiazhong Qian
Appl. Sci. 2022, 12(14), 7328; https://doi.org/10.3390/app12147328 - 21 Jul 2022
Cited by 1 | Viewed by 1543
Abstract
Fracture seepage is an important aspect of groundwater research, but due to the closure of fractures and the randomness of wall surface roughness, it is a challenge to carry out relevant research. Numerical simulation serves as a good way to solve this problem. [...] Read more.
Fracture seepage is an important aspect of groundwater research, but due to the closure of fractures and the randomness of wall surface roughness, it is a challenge to carry out relevant research. Numerical simulation serves as a good way to solve this problem. As such, the water flow in single fracture with different shapes and densities of roughness elements (various bulges/pits on fracture wall surfaces) on wall surface was simulated by Fluent software. The results show that, in wider rough fractures, the flow rate mainly depends on fracture aperture, while, in narrow and close rough fracture medium, the surface roughness of fracture wall is the main factor of head loss of seepage; there is a negative power exponential relation between the hydraulic gradient index and the average fracture aperture, i.e., with increase of rough fracture aperture, both the relative roughness of fracture and the influence of hydraulic gradient decrease; in symmetrical-uncoupled rough fractures, there is a super-cubic relation between the discharge per unit width and average aperture; the rough fracture permeability coefficient K is not a constant which is affected by the scale effect and the density of roughness elements. Results found provide further understanding of rough fracture seepage. Full article
(This article belongs to the Special Issue Fractured Reservoirs 2021)
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14 pages, 4424 KiB  
Article
Lithology-Controlled Hydrodynamic Behaviour of a Fractured Sandstone–Claystone Body in a Radioactive Waste Repository Site, SW Hungary
by Emese Tóth, Ervin Hrabovszki, Félix Schubert and Tivadar M. Tóth
Appl. Sci. 2022, 12(5), 2528; https://doi.org/10.3390/app12052528 - 28 Feb 2022
Cited by 3 | Viewed by 1568
Abstract
The fracture network modelling and hydrogeological assessment were performed in an 845 m deep borehole of the potential high-level waste repository formation and its caprock. The geometry of the fracture network was simulated using the discrete fracture network (DFN) modelling method, which is [...] Read more.
The fracture network modelling and hydrogeological assessment were performed in an 845 m deep borehole of the potential high-level waste repository formation and its caprock. The geometry of the fracture network was simulated using the discrete fracture network (DFN) modelling method, which is based on the geometric characteristics of the individual fractures. The hydrogeological evaluation was based on changes in porosity and permeability along the borehole using flow zone indicator (FZI) values that denote hydraulic flow units (HFU) within the rock body. Fracture network characteristics and hydrogeological features are mainly determined by the wellbore lithology, which can be divided into three zones. The sandstone body was intersected in the upper 300 m of the borehole, which forms a single HFU. The second zone was developed along with the transition zone between the sandstone and the underlying claystone bodies. Here the predominant rock type is claystone, but the characteristics of the fracture network are distinctly different from the deeper parts of this rock body. Below 400 m is the third zone, where distinct and extensive HFU-s could not form, probably due to different water–rock interaction processes that could have changed the porosity and permeability from point to point in the claystone. Full article
(This article belongs to the Special Issue Fractured Reservoirs 2021)
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