Ming Li

China University of Mining and Technology

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Huayang Dai

China University of Mining and Technology

Bo Jiang

China University of Mining and Technology

Yueguan Yan

China University of Mining and Technology

Miao Qi

Communication University of Zhejiang

Linda Dai

China University of Mining and Technology

Weiqi Zhang

University of Chinese Academy of Sciences

Guishan Zhang

Chang'an University

Juan Cao

Xiamen University

Zhaojiang Zhang

Hebei University of Engineering

Fengjuan Lan

China University of Mining and Technology

Cooperative Institutions

China University of Mining and Technology

Chinese Academy of Sciences

Ministry of Education of the People's Republic of China

Zhengzhou University

National Institute of Clean and Low-Carbon Energy

University of Science and Technology Beijing

Nanjing University of Science and Technology

Ministry of Natural Resources

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

University of Electronic Science and Technology of China

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Study on Rock and Surface Subsidence Laws of Super-High Water Material Backfilling and Mining Technology: A Case Study in Hengjian Coal Mine

Sustainability (2023)

Ming Li Yueguan Yan Huayang Dai Zhaojiang Zhang

Research on the rock and surface subsidence laws of super-high water material backfilling and mining technology can provide a scientific basis for liberating coal resources that are deposited under buildings, railways, and bodies of water. Using field measurements, numerical simulations, and theoretical analyses to study the geological mining conditions of the Hengjian Mine in Handan, Hebei Province, this research comprehensively analyzes the dynamic and static deformation laws of rock and surface subsidence, reveals the subsidence control mechanism, complements existing studies and helps improve the feasibility of new technology in engineering practices. This study shows that rock and surface subsidence values are smaller when the super-high water material backfilling and mining technology are used, and the surface movement parameters are smaller than those of the fully caving mining method. The backfilling material supports the rock load above the mining area and suppresses the rock and surface subsidence. In addition, the super-high water backfilling material limits the height of the developing stress arch above the mining area, thus reducing the range of deformation in the rock and surface movement. In engineering practice, the development of the stress arch can be controlled by increasing the backfilling rate and the strength of the backfilling material. With the above-mentioned discoveries, this research is of great significance to the promotion and application of super-high water material backfilling and mining technology and the liberation of deposited coal resources.

Groundwater-related subsidence

Surface mining

10.3390/su15118713

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Citations (3)

Characteristics of Coalbed Methane Reservoirs in Faer Coalfield, Western Guizhou

Energy Exploration & Exploitation (2013)

Ming Li Bo Jiang Shoufa Lin Fengjuan Lan Guishan Zhang

Based on analysis of the geological background and gas content data in Faer coalfield, we discuss the occurrence characteristics of coalbed methane (CBM) and its distribution along the stratigraphic sequence and in coal seams. We analyze the methane adsorption isotherm experiments, reservoir deformations and mercury intrusion porosimetry (MIP), and further discuss the reservoir physical properties. The results show that gas content and gas content gradient of CBM fluctuate with stratigraphic sequence that is mainly caused by the difference in absorption capacity of each coal seam and distributions of CBM reservoir pressure systems. The relatively low gas content gradients of those coal seams buried below 500 m depth result from the dissipation of CBM into the surrounding rocks of thin and unstable Nos. 28 to 34 coal seams and the lateral migration of CBM along the strata in high-elevation area. The Yangmeishu syncline and topography are the main controlling factors that affect the current distribution pattern of CBM content, which is higher in the north than in the south and has a northeastern trend. The theoretical gas saturation is generally lower than 60%, combined with well-developed brittle fractures and macropores, formed by structural deformation. The exploration prospects for CBM in Faer coalfield is good.

Coalbed Methane

Syncline

Macropore

Saturation (graph theory)

10.1260/0144-5987.31.3.411

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Citations (12)

Stress and deformation analysis on deep surrounding rock at different time stages and its application

International Journal of Mining Science and Technology (2012)

Ming Li Xianbiao Mao Yuanlin Yu Kai Li Chao Ma

10.1016/j.ijmst.2012.04.003

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Citations (19)

Research on remaining oil evaluation method based on cased hole logging technology

Energy Reports (2021)

Ming Li Rui Deng Juan Cao Jinquan Qiu Gang Lei

In the later stage of the production and development of HB Oilfield, the oil reservoir fluid type is complex. With the development of multi-layer system. The reservoir variables between different types of oil and gas reservoirs are large, and the relationship between oil and water is complex. Most main oil layers have high water drives, and the actual application problem of complex in the formation water mineralization, the surplus oil distribution is complicated. It is highly distinguished by low-facing and low mineral layers in low pores. The property is characterized by reservoir fluid analysis evaluation. During the interpretation process, the influence of the wellbore, invasive belt is eliminated, and the accuracy of the capture of the cross-section curve is guaranteed, and related parameters such as reservoir, oil-containing saturation degree can be accurately and reliably. The accuracy of oil-water layer recognition has been increased to 80%, and the coincidence rate of saturation interpretation has been greatly improved.

Water cut

Saturation (graph theory)

10.1016/j.egyr.2021.09.149

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Citations (3)

Variation of in situ stress regime in coal reservoirs, eastern Yunnan region, South China: Implications for coalbed methane production

AAPG Bulletin (2018)

Wei Ju Bo Jiang Miao Qi Jilin Wang Zhenghui Qu

Knowledge of in situ stress distribution is fundamental for coalbed methane production; however, it is poorly understood in the eastern Yunnan region, South China. In this study, the horizontal maximum (SHmax) and minimum (Shmin) principal stress and vertical stress (Sv) were systematically analyzed for the first time. The results indicated that the magnitudes of SHmax, Shmin, and Sv showed positive correlations with burial depth. In general, three types of in situ stress fields were determined: (1) SHmax > Sv > Shmin in shallow layers with burial depths less than approximately 600 m (∼1970 ft) below ground level (bgl), indicating a dominant strike-slip faulting stress regime; (2) in medium layers approximately 600–800 m (∼1970–2625 ft) bgl, the in situ stress state followed multiple relationships, suggesting that the in situ stress regime was transformed; and (3) Sv > SHmax >Shmin in deep layers with burial depths greater than approximately 800 m (∼2625 ft) bgl, indicating a dominant normal faulting stress regime. Coal permeabilities obtained from injection–falloff well tests showed that they were widely distributed, and no obvious relationships were found between coal permeability and effective in situ stress magnitude. In the study area, the development and orientation of previously generated natural fractures combined with the present-day in situ stress distribution controlled the permeability in coal reservoirs. Differential stress and presence of natural fractures significantly affected the geometry and pattern of hydraulic fractures. In addition, in the eastern Yunnan region, locations with relatively deep depths in vertical wells and approximately west–northwest/east–southeast-trending horizontal wells suffered high potential of borehole instability because of the high differential stress.

Coalbed Methane

10.1306/04241817376

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Citations (34)

Detailed in Situ Stress Characterization Combining Well Logging and Improved Magnitude Calculation Model of Nos. 8+9 Coal Seam in Northeastern Ordos Basin

Energy & Fuels (2024)

Ziwei Wang Yong Li Jianhong Qu Lifu Xu Weiqi Zhang

The characteristics of in situ stress directly influence reservoir modification and gas production performance, and accurate evaluation of stress distribution can help improve coalbed methane production and development efficiency. Taking the deep carboniferous Nos. 8+9 coal seam in the northeastern Ordos Basin as an example, different in situ stress calculation models were evaluated with comparison to injection/falloff tests based on logging data and coal mechanical parameters. Then, the hydraulic fracture extension mechanism under different in situ stress conditions was simulated. The results show that the comprehensive use of microresistivity imaging logging and dipole array acoustic logging reveals that the main maximum horizontal principal stress direction of the Nos. 8+9 coal seam is E–W, with some area affected by faults showing NE–SW and SEE–NWW. Comparing the commonly used acoustic logging model, Huang's model, the combined spring model, and Ge's model, it was found that the combined spring model is more applicable. This model was optimized by adding a gas saturation parameter, decreasing the relative error of stress magnitude from 7.80 to 3.62% compared to the injection/falloff measurement results. The stress field shows vertical stress > maximum horizontal principal stress > minimum horizontal principal stress. The simulation indicates that the higher the horizontal stress difference, the smaller the fracture initiation pressure and width. The larger the injection angle, the higher the fracture initiation pressure and the smaller fracture width. The above results reveal the in situ stress distribution characteristics of the Nos. 8+9 coal seam in the northeastern Ordos Basin, providing data support for the subsequent deployment of wells and reservoir fracturing as well as guidance for deep coal seams in other basins.

Characterization

10.1021/acs.energyfuels.3c05062

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Citations (2)

Construction of “Space-Sky-Ground” Integrated Collaborative Monitoring Framework for Surface Deformation in Mining Area

Remote Sensing (2022)

Yueguan Yan Ming Li Linda Dai Junting Guo Huayang Dai

Ground deformation measurements in mining areas play a key role in revealing the surface subsidence law, retrieving the subsidence parameters, warning of geological disasters and restoring the surface ecology. With the development of science and technology, there have emerged a great number of monitoring techniques and buildings of diverse protection levels. The diversity of monitoring techniques and the multiplicity of monitoring objects have brought challenges for surface deformation monitoring in the coal industry. Based on the existing deformation monitoring techniques, this paper established a framework of “space-sky-ground” collaborative monitoring system in mining area. We also constructed an AHP-TOPSIS (Analytic Hierarchy Process method- Technique for Order Preference by Similarity to an Ideal Solution) preference model of “space-sky-ground” collaborative monitoring of surface deformation in mining area, and carried out engineering application. Our study shows that the framework of the “space-sky-ground” collaborative monitoring system for surface subsidence in mining areas established in this paper, combined with the AHP-TOPSIS monitoring preference model, which can fully combine the advantages of each monitoring technique, overcome the limitations of a single monitoring technique, comprehensively obtain the surface subsidence data and work out the surface deformation subsidence pattern. This information provides a data and technical support for surface environment management.

Deformation monitoring

Groundwater-related subsidence

TOPSIS

10.3390/rs14040840

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Citations (8)