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Frontiers in Resources Recovery and Clean Energy of Sustainability from Geo Resources

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Waste and Recycling".

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 3456

Special Issue Editors

Dr. Pabasara Wanniarachchige

E-Mail Website
Guest Editor
School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
Interests: geothermal energy extraction; reservoir stimulation (hydraulic fracturing, thermal fracturing, non-water-based fracturing, and rock fragmentation); industrial and mining waste utilization for civil and geotechnical applications
Dr. Zhenlong Song

E-Mail Website
Guest Editor
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China
Interests: machine learning; acoustic emission; rock mechanics; geomechanics; rock seepage
Prof. Dr. Ranjith Pathegama Gamage

E-Mail Website1 Website2
Guest Editor
Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia
Interests: carbon sequestration; mine waste recycling; geothermal energy; coal seam gas; shale gas; hydrogen fuel; deep mining; natural gas hydrates
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The recently released IPCC report suggests that atmospheric temperatures could increase to 1.5 °C above pre-industrial levels in the next decade due to anthropogenic emissions and associated global warming unless urgent measures are taken on climate change. The severity of this can be underpinned by the fact that only since the last ice age, there had only been a 5 °C increment of global warming and that occurred over 5000 years. Therefore, it is undoubtedly a collective human responsibility to prioritize climate change tackling policies, mitigate greenhouse gas emissions, and promote low-carbon competitiveness, in addition to the economic recovery strategies that need to be implemented in the post-COVID-19 period.

Human civilization and economic development depend on energy and resource recovery, while the Earth is the primary source of recovering energy and resource, including oil and gas, minerals, and geothermal energy. Although significant advances have been achieved to harness the Earth's abundant energy and mineral resources in terms of resource exploration, deep drilling, mineral extraction, reservoir stimulation, reservoir modeling advances of geo-mechanics, geophysics, and geochemistry, conventional mining and Earth energy and resource recovery practices often carry a negative legacy in their detrimental environmental and social impacts. Thus, prioritizing both sustainability and large-scale economic viability of cutting-edge technologies of geoenergy resources is vital to reaching economic, employment, and emissions targets of a country and further promoting and advancing the UN’s Sustainable Development Goals.

Considering the progression of research and industrial initiatives for technological advances and the high level of innovation on georesource recovery and clean energy technologies from georesources, this Special Issue is dedicated to exploring recent contributions of science and technology to adopting sustainable measures for energy and resource recovery as well as developing technologies for efficient use of finite natural resources. We will particularly welcome submissions on the following topics:

  • Sustainable clean energy technologies from geoenergy resources, including environmentally safe sustainable technologies for georesource recovery, for example, minerals, rare Earth elements, oil/gas, and geothermal energy;
  • Emerging technologies for geoenergy and georesource exploration and assessment;
  • Analysis and modelling of geoenergy production and georesource recovery and management;
  • Initiatives towards the circular economy in the field of georesource utilization;
  • Environmental, economic, and social concerns of geoenergy and georesource recovery;
  • Role of geoenergy and georesource recovery in tackling climate change;
  • Case studies of international interest that demonstrate successful implementation processes and strategies.

Dr. Pabasara Wanniarachchige
Dr. Zhenlong Song
Prof. Dr. Ranjith Pathegama Gamage
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. Sustainability 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

  • sustainability
  • geoenergy
  • georesources
  • minerals
  • oil and gas
  • geothermal energy

Published Papers (2 papers)

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Research

19 pages, 32575 KiB  
Article
Experimental and Numerical Investigation of the Flow Behaviour of Fractured Granite under Extreme Temperature and Pressure Conditions
by Wanniarachchige Gnamani Pabasara Kumari and Pathegama Gamage Ranjith
Sustainability 2022, 14(14), 8587; https://0-doi-org.brum.beds.ac.uk/10.3390/su14148587 - 13 Jul 2022
Cited by 4 | Viewed by 1536
Abstract
As a result of negligible connected porosity—and thus, minimal matrix permeability—the fluid-transport characteristics of crystalline rocks are strongly influenced by the fractures at all scales. Understanding the flow behaviour of fractured rock under extreme stress and temperature conditions is essential for safe and [...] Read more.
As a result of negligible connected porosity—and thus, minimal matrix permeability—the fluid-transport characteristics of crystalline rocks are strongly influenced by the fractures at all scales. Understanding the flow behaviour of fractured rock under extreme stress and temperature conditions is essential for safe and effective deep geo-engineering applications, such as deep geothermal recovery, geological nuclear waste disposal, oil and gas extraction, geological storage and deep mining operations. Therefore, this study aims to investigate the flow characteristics of mechanically fractured Australian Strathbogie granite under a wide range of stress (confining pressures 1–80 MPa) and temperature conditions (20 °C to 350 °C). The study utilised a sophisticated high-temperature, high-pressure tri-axial setup capable of simulating extreme geological conditions, followed by a numerical simulation. According to the experimental results, a linear increment in the steady-state flow rate was observed, with increased injection pressure for the experimental conditions considered. Therefore, linear laminar Darcy flow was considered, and the fracture permeability was calculated using the cubic law. It was found that stress and temperature strongly depend on the flow of fluid through fractures. The steady-state flow rate decreased exponentially with the increase in normal stress, showcasing fracture shrinkage with an increment in effective stress. With regard to permeability through the fractures, increasing temperature was found to cause an initial reduction in fracture permeability due to an increased interlock effect (induced by thermal overclosure), followed by increments because of the thermally induced damage. Furthermore, the increasing temperature caused significant non-linear increments in the fluid flow rates due to the associated viscosity and density reduction in water. Considering the laboratory-scale flow-through exercises, a fully coupled numerical model that can predict hydro–thermo–mechanical variations in the reservoir rocks was developed using the COMSOL Multiphysics simulator. The developed model was calibrated, utilising the temperature- and pressure-dependent properties of granite rocks and fluid (water); was validated against the experimental results; and was used to predict the permeability, pressure development and strain of rock samples under extreme conditions, which were difficult to achieve in the laboratory. Full article
(This article belongs to the Special Issue Frontiers in Resources Recovery and Clean Energy of Sustainability from Geo Resources)
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9 pages, 1897 KiB  
Article
A Case Study on the Fracturing Radius and Time Effects of CO2 Phase Transition Fracturing in Coal Seams
by Hong Yin, Yuan Deng, Chao Liu, Yafei Chen, Ziqiang Chen, Chao Qin and Donglin He
Sustainability 2022, 14(7), 4260; https://0-doi-org.brum.beds.ac.uk/10.3390/su14074260 - 03 Apr 2022
Viewed by 1368
Abstract
CO2 phase transition fracturing (CPTF) is considered to be a promising way to improve the recovery efficiency of coalbed methane in deep, tight coal seams. In addition, it is significant to the CO2-ECBM and CO2 storage in coal. To [...] Read more.
CO2 phase transition fracturing (CPTF) is considered to be a promising way to improve the recovery efficiency of coalbed methane in deep, tight coal seams. In addition, it is significant to the CO2-ECBM and CO2 storage in coal. To better understand the fracturing radius and time effects of CPTF, a field experimentation was conducted on the Ji-15 coal seam of Pingmei 8th Coal Mine. The results indicate that the fracturing radius and time effects are significantly related; with the increase in fracturing radius, the time for extraction rate to reach the peak value is shorter. The calculated value of effective fracturing radius is 7.56 m via the fitting relationship. According to the CO2 content in different extraction boreholes after fracturing, it can be concluded that the crack zone is 5 m. In addition, the extraction rate of methane firstly increases slowly for a while, and then reaches the peak. This work could provide theoretical directions for the arrangement of fracturing and extraction boreholes in CO2 fracturing works related to CO2-ECBM and gas pre-extraction in coal mining. Full article
(This article belongs to the Special Issue Frontiers in Resources Recovery and Clean Energy of Sustainability from Geo Resources)
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