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2025 Vol. 47, No. 1

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2025, 47(1): .
Abstract(79) PDF-CN(23)
Abstract:
Progress and insights from worldwide deep coalbed methane exploration and development
ZHANG Jiaqi, LIU Zengqin, SHEN Baojian, ZHAO Shihu, CHEN Xinjun, YE Jincheng
2025, 47(1): 1-8. doi: 10.11781/sysydz2025010001
Abstract(352) HTML (109) PDF-CN(94)
Abstract:
Since 2021, China has achieved significant breakthroughs in deep coalbed methane (CBM) exploration and development, making it a strategic resource for increasing natural gas reserves and production. To further support the high-quality development of deep CBM in China, it is urgent to study the CBM r...
Current status and development trends of deep coalbed methane research in China
JU Wei, TAO Shu, YANG Zhaobiao, CHENG Jiayao, SHANG Haiyan, NING Weike, WU Chunlong
2025, 47(1): 9-16. doi: 10.11781/sysydz2025010009
Abstract(321) HTML (82) PDF-CN(87)
Abstract:
Deep coalbed methane (CBM) possesses enormous resource potential and is essential for increasing unconventional natural gas reserves and production on a large scale in China. To understand the current status of CBM research and development in China, systematic retrieval and classification of deep CB...
Geological characteristics of deep coal rock and main geological factors controlling coalbed methane enrichment: a case study of the M area in the eastern Ordos Basin
GUO Xiaojiao, WANG Lei, YAO Xianzhou, LI Xu, ZHANG Linke, WANG Xiaoshuang
2025, 47(1): 17-26. doi: 10.11781/sysydz2025010017
Abstract(228) HTML (91) PDF-CN(58)
Abstract:
The 8# thick coal seam is widely distributed with high organic matter thermal maturity at the top of the Upper Carboniferous Benxi Formation in the M area of the Ordos Basin. However, the coal seams in this area are characterized by large burial depth, rapid lateral changes, strong heterogeneity, an...
Evaluation method and application for in-situ stress in No. 8+9 coal seam, southern Shenfu block, northeastern margin of Ordos Basin
WU Jiawei, TANG Wei, ZHU Yanhe, WANG Cunwu, TIAN Yongjing, ZI Jingyu, YANG Jianghao, SHI Xian
2025, 47(1): 27-42. doi: 10.11781/sysydz2025010027
Abstract(173) HTML (60) PDF-CN(45)
Abstract:
The direction and magnitude of the present in-situ stress influence the propagation of hydraulic fractures in coal seams, making it a key geological parameter for coalbed methane (CBM) well network deployment and fracturing design. Accurate evaluation of the present in-situ stress direction and magn...
Main controlling factors of production and reasonable fracturing scale optimization of deep coalbed methane wells in Shenfu block, Ordos Basin
SUN Lichun, LIU Jia, LI Na, LI Xinze, WEN Heng
2025, 47(1): 43-53. doi: 10.11781/sysydz2025010043
Abstract(189) HTML (89) PDF-CN(46)
Abstract:
The production of deep coalbed methane (CBM) wells in the Shenfu block of Ordos Basin varies greatly, with a lack of understanding of the main controlling factors. To further reveal the production patterns in deep CBM wells, identify key factors affecting well production capacity, and guide the effi...
Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin
WANG Jinwei, XU Hao, LIU Yinan, ZHANG Bing, XU Yanyong, LIU Ding, ZONG Peng, WANG Yajuan, SONG Xuejing
2025, 47(1): 54-63. doi: 10.11781/sysydz2025010054
Abstract(167) HTML (77) PDF-CN(29)
Abstract:
The Linxing-Shenfu area in the Ordos Basin is one of the key areas for deep coalbed methane (CBM) development in China. However, significant variations in water production among CBM wells in different regions have hindered the efficient development of deep CBM. This study conducted multi-scale chara...
Geological characteristics and main enrichment controlling factors of coalbed methane in Nanchuan area, southeastern Sichuan Basin
HE Xipeng, WANG Kaiming, LUO Wei, GAO Yuqiao, LIU Nana, GUO Tao, ZHOU Yatong, WU Didi
2025, 47(1): 64-76. doi: 10.11781/sysydz2025010064
Abstract(219) HTML (69) PDF-CN(52)
Abstract:
A significant strategic breakthrough has been achieved in the exploration of deep coalbed methane (CBM) in the Upper Permian Longtan Formation in the Nanchuan area, southeastern Sichuan Basin, showing promising exploration potential for CBM in this area. To identify the main geological factors contr...
Compressibility characteristics and modification effect of coal reservoirs in Longtan Formation, Nanchuan area, southeast Chongqing
LIU Jinxian, GUO Tao, ZHOU Yatong, LI Dongyang, JIN Xiaobo
2025, 47(1): 77-88. doi: 10.11781/sysydz2025010077
Abstract(154) HTML (76) PDF-CN(43)
Abstract:
Fracturing modification is an important method for enhancing the permeability and conductivity in coalbed methane (CBM) wells. To better guide the development and production of CBM wells in Longtan Formation of Nanchuan area, southeast Chongqing, the study comprehensively applied various experimenta...
Characteristics, controlling factors of development and exploration areas of deep coal-rock reservoirs in rift basins: a case study of the second member of Cretaceous Nantun Formation in Huhehu Sag, Hailar Basin
GAO Geng, XIE Yingyi, HOU Beibei, MA Wenjuan, XU Hui, WANG Yujie, HUO Yingdong, ZHANG Jingyuan, LIU Shichao, ZHAO Wei, LIANG Yuan
2025, 47(1): 89-103. doi: 10.11781/sysydz2025010089
Abstract(208) HTML (91) PDF-CN(33)
Abstract:
In recent years, major breakthroughs have been made in deep coal-rock gas exploration, revealing the promising exploration prospects of such resources. This has become a new hotspot in unconventional oil and gas exploration and development, following tight oil and gas and shale oil and gas. The seco...
Combined multi-scale characterization of pores in ultra-thick coal seams of Jurassic Xishanyao Formation, Tiaohu-Malang sags, Santanghu Basin
CHEN Yue, LEI Qiqi, MA Dongmin, WANG Xin, WANG Xinggang, HUANG Diefang, RONG Gaoxiang
2025, 47(1): 104-116. doi: 10.11781/sysydz2025010104
Abstract(120) HTML (52) PDF-CN(30)
Abstract:
The ultra-thick coal seams in the middle and lower parts of the Jurassic Xishanyao Formation in the Santanghu Basin are widely distributed. However, research on the pore characteristics of these ultra-thick coal seams is limited. To accurately characterize the porosity features of these coal reservo...
Accumulation conditions and target area evaluation of coalbed methane in eastern uplift of Junggar Basin
YU Qixiang, TIAN Mi, LUO Yu, YANG Fan, CHEN Yan'e, WANG Feng, GAO Yuqiao, GUO Tao
2025, 47(1): 117-129. doi: 10.11781/sysydz2025010117
Abstract(169) HTML (51) PDF-CN(50)
Abstract:
The eastern uplift of the Junggar Basin has great coalbed methane (CBM) exploration potential. CBM selection and evaluation will provide scientific guidance and direction for CBM exploration in the region. Utilizing well logging data, core analysis test results, and seismic data, well-seismic calibr...
Combined characterization of pore structurein deep medium-rank coal using mercury intrusion and liquid nitrogen adsorption methods and its pore fractal characteristics
LI Qi, WU Yong, QIAO Lei
2025, 47(1): 130-142. doi: 10.11781/sysydz2025010130
Abstract(153) HTML (68) PDF-CN(32)
Abstract:
To study the pore structure and fractal characteristics of deep medium-rank coal, combined characterization using mercury intrusion and liquid nitrogen adsorption methods was conducted on coal samples from the main coal seams in typical deep mining areas, including Shenyang Hongyang Third Mine, Kail...
Research and insights for application of CO2-ECBM technology in deep high-rank coal seams: a case study of Jinzhong block, Qinshui Basin
ZHENG Yongwang, CUI Yinan, LI Xin, XIAO Cui, GUO Tao, ZHANG Dengfeng
2025, 47(1): 143-152. doi: 10.11781/sysydz2025010143
Abstract(164) HTML (67) PDF-CN(30)
Abstract:
Deep high-rank coal seams have significant resource potential, but exhibit characteristics of "strong adsorption and weak desorption", making it challenging to effectively utilize with conventional development methods. Compared with other enhanced recovery technologies such as chemical flooding and ...
Hydraulic fracture propagation characteristics of directional perforation fracturing in horizontal wells for deep coalbed methane
HUANG Shuxin, LI Song, CHEN Bo
2025, 47(1): 153-162. doi: 10.11781/sysydz2025010153
Abstract(175) HTML (62) PDF-CN(32)
Abstract:
Deep coalbed methane resources exhibit favorable geological characteristics and significant exploration and development potential, offering a substantial foundation for China's strategy to enhance natural gas storage and production. Directional perforation fracturing of horizontal wells is widely us...
Analysis of pressure-maintaining coring process in deep coal seams and gas content determination methods
WU Jian, ZHANG Songhang, JIA Tengfei, CHAO Weiwei, PENG Wenchun, LI Shilong
2025, 47(1): 163-172. doi: 10.11781/sysydz2025010163
Abstract(160) HTML (62) PDF-CN(37)
Abstract:
Gas content is an important parameter for calculating coalbed methane (CBM) reserves and guiding their exploration and development. For deep coal seams, the prolonged coring duration and inaccuracies in lost gas volume calculations result in reduced accuracy in gas content measurement using conventi...
Study on microscopic pore structures and mechanical properties
ZHAO Shihu, LI Yong, LIU Yali, WANG Yanbin, LIU Zengqin, CHEN Gang, CHEN Xinjun
2025, 47(1): 173-183. doi: 10.11781/sysydz2025010173
Abstract(135) HTML (80) PDF-CN(23)
Abstract:
The pore structures and mechanical properties of coal are key parameters for geological evaluation of coalbed methane, reflecting its reservoir capacity and compressibility. The study investigated four coal samples from the Qinshui and Datong basins in Shanxi Province, including Jurassic coal from D...
Study on sedimentary organic facies of coal-measure source rocks in Shuixigou Group, Taibei Sag, Tuha Basin
LIANG Hao, FAN Tanguang, WANG Zhiyong, TAO Shu, WEN Yijie, ZHENG Haitian, ZHANG Zijian
2025, 47(1): 184-194. doi: 10.11781/sysydz2025010184
Abstract(146) HTML (69) PDF-CN(13)
Abstract:
The Taibei Sag in the Tuha Basin contains abundant oil and gas resources. The coal-measure source rocks in the Jurassic Shuixigou Group are the main hydrocarbon source layers in the area, with significant hydrocarbon generation potential. However, organic facies types of the coal-measure source rock...
Impact of new coalbed methane wells on old well productivity and its controlling factors: a case study of Shizhuangnan block in Qinshui Basin
HAN Xueting, MENG Shangzhi, LIU Guangjing, REN Zhenyu, TAO Shu, MEN Xinyang, WEI Ziyang
2025, 47(1): 195-203. doi: 10.11781/sysydz2025010195
Abstract(96) HTML (52) PDF-CN(16)
Abstract:
To address the issue of uneven productivity release in the Shizhuangnan block of the Qinshui Basin, the initial well pattern is optimized through horizontal well infill to enhance reservoir utilization. However, frequent occurrences of drilling mud and fracturing fluid migration to neighboring wells...
Brittleness evaluation of main coal seams in Permian Taiyuan-Shanxi formations, Baode block, Ordos Basin: based on a convolutional neural network method
ZHANG Qingfeng, LI Ziling, ZHANG Jikun, HAO Shuai, SUN Xiaoguang, SHANG Yanjie, ZUO Yun
2025, 47(1): 204-212. doi: 10.11781/sysydz2025010204
Abstract(92) HTML (44) PDF-CN(16)
Abstract:
The coal seams of the Permian Taiyuan-Shanxi formations in the Baode block of the northeastern margin of the Ordos Basin have abundant coalbed methane resources. However, the productivity varies greatly among wells, mainly attributed to the strong heterogeneity caused by regional differences in rese...
Geological characteristics and development effect evaluation of coalbed methane reservoirs in Panguan syncline, Guizhou Province
HU Haiyang, YANG Fuqin, CHEN Jie, LOU Yi, WAN Yuting
2025, 47(1): 213-222. doi: 10.11781/sysydz2025010213
Abstract(99) HTML (50) PDF-CN(22)
Abstract:
The Upper Permian Longtan Formation in Guizhou Province contains multiple coal seams with abundant coalbed methane (CBM) resources, providing a solid base for CBM development. However, the low permeability of the coal seams hinders gas and water production, necessitating the development of key techn...

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