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Processes
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Theoretical Progress in the Exploration and Development of Deep Coal-Measure...
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Theoretical Progress in the Exploration and Development of Deep Coal-Measure Gas

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Chemical Processes and Systems".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 1016

Special Issue Editors

Dr. Junjian Zhang

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Guest Editor
College of Earth Sciences & Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Interests: unconventional resource; methane adsorption; molecular structure
Special Issues, Collections and Topics in MDPI journals
Dr. Fangkai Quan

E-Mail Website
Guest Editor
School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
Interests: methane desorption; reservoir simulation; methane extraction
Dr. Xuanxuan Chu

E-Mail Website1 Website2
Guest Editor
School of Ocean Engineering, Harbin Institute of Technology, Weihai 264209, China
Interests: unsaturated soil mechnics; offshore geotechnical engineering

Special Issue Information

Dear Colleagues,

The drainage of coal-measure gas, represented by deep coalbed methane, has made significant progress. The daily production of deep coalbed methane in the Ordos Basin of China has exceeded 100000 m3/d, indicating that its development has excellent prospects. The purpose of this Special Issue is to summarize the current theory of deep coalbed methane accumulation and enrichment and clarify the respective laws. Meanwhile, due to the accuracy of the instruments currently used as well as the high temperature and pressure conditions, the physical parameters of deep coal seams cannot be directly obtained. Therefore, this Special Issue aims to summarize and clarify methods for predicting and evaluating the physical and gas properties of deep coal reservoirs and seams. In addition, advanced theories of deep coalbed methane development technology require summation.

Dr. Junjian Zhang
Dr. Fangkai Quan
Dr. Xuanxuan Chu
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. Processes 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 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

  • deep coal seam
  • coal reservoirs
  • physical properties
  • development technology
  • predictive evaluation

Published Papers (2 papers)

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Research

17 pages, 11594 KiB  
Article
Geochemical Characteristics and Hydrocarbon Generation Potential of Coal-Measure Source Rocks in Julu Sag
by Yang Wang, Hanyu Zhang, Liu Yang, Yanming Zhu and Zhixiang Chang
Processes 2024, 12(7), 1399; https://doi.org/10.3390/pr12071399 - 4 Jul 2024
Viewed by 324
Abstract
To uncover the reservoir characteristics and enrichment law of coal-measure gas in Julu sag, Hebei Province, and achieve co-exploration and co-mining, it is necessary to conduct a comprehensive analysis. In this study, we investigated the characteristics of coal-measure gas accumulation in the Taiyuan [...] Read more.
To uncover the reservoir characteristics and enrichment law of coal-measure gas in Julu sag, Hebei Province, and achieve co-exploration and co-mining, it is necessary to conduct a comprehensive analysis. In this study, we investigated the characteristics of coal-measure gas accumulation in the Taiyuan Formation and Shanxi Formation in the Julu area. This was achieved by collecting data on coal-measure source rocks and organic geochemistry, which were then combined with regional geological conditions. This study indicates that the coal seams and shales of Shanxi Formation and Taiyuan Formation in the study area serve as the primary source rocks. The predominant macerals found in coal rock are vitrinite. Furthermore, the organic matter type present in shale is primarily categorized as type II2, with the organic matter maturity falling within the immature–mature stage. Based on the simulation results of tectonic-burial history, thermal evolution history, and hydrocarbon generation history in the study area, it is evident that the coal-measure source rocks experienced their first peak of hydrocarbon generation during the Mesozoic era as a result of deep metamorphism. Subsequently, the area experienced uplift and erosion, leading to the release of coal-bearing natural gas. Since the Paleogene period, the coal-bearing source rocks have undergone sedimentary burial and entered the secondary hydrocarbon generation stage, resulting in significant production of oil and gas. Based on the analysis of gas content, buried depth, source rock thickness, and sealing conditions in the study area, it is evident that the potential of coal-measure gas resources in the study area is primarily comprised of shale gas with supplementary coalbed methane. It can be inferred that the deeper areas within the study area hold greater exploration prospects. Full article
(This article belongs to the Special Issue Theoretical Progress in the Exploration and Development of Deep Coal-Measure Gas)
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12 pages, 3587 KiB  
Article
Research on Mechanism of Surfactant Improving Wettability of Coking Coal Based on Molecular Dynamics
by Ren Liu, Shilin Li, Yuping Ling, Yuanpei Zhao and Wei Liu
Processes 2024, 12(6), 1271; https://doi.org/10.3390/pr12061271 - 20 Jun 2024
Viewed by 354
Abstract
Coal dust is a major safety hazard in the process of coal mining and is of great importance to ensure production safety and maintain the health of operators. In order to understand the microscopic mechanism during coal seam water injection and reveal the [...] Read more.
Coal dust is a major safety hazard in the process of coal mining and is of great importance to ensure production safety and maintain the health of operators. In order to understand the microscopic mechanism during coal seam water injection and reveal the mechanism of surfactants in improving the wettability of coal dust, coking coal was selected as the research object. Three surfactants, SDBS, AEO-9, and CAB-35, were chosen for molecular dynamics simulation research on the wetting and adsorption properties of water/coal/surfactants. The results show that surfactant molecules can cover the hydrophobic groups on the surface of coking coal, forming a hydrophilic adsorption layer, changing the coal surface from hydrophobic to hydrophilic, and enhancing the wettability. After adding surfactants, the thickness of the adsorption layer in the z-axis direction increases, expanding the contact area between coking coal and water molecules, thereby improving the wettability. When surfactants tightly cover the surface of coking coal, their binding strength increases, forming a more stable hydrophilic layer and further improving the wettability. At the same time, surfactants promote the diffusion of water molecules and enhance the interaction between hydrophobic alkyl chains and water molecules, further enhancing the wetting effect. Full article
(This article belongs to the Special Issue Theoretical Progress in the Exploration and Development of Deep Coal-Measure Gas)
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