Differential accumulation of coalbed methane in medium- to low-rank coal seams in a strongly compressional tectonic setting in the Tarim Basin

Authors

• LIU Honglin, Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China; Key Laboratory of Coal Rock Gas, PetroChina, Beijing 100083, China; National Energy Shale Gas Research and Development (Experimental) Center, Langfang 065007, ChinaFollow
• WANG Hongyan, National Elite Institute of Engineering, CNPC, Beijing 100083, China
• WANG Haichao, School of Geology and Mining Engineering, Xinjiang University, Urumqi 830047, China
• DENG Ze, Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China; Key Laboratory of Coal Rock Gas, PetroChina, Beijing 100083, China; National Energy Shale Gas Research and Development (Experimental) Center, Langfang 065007, China

Abstract

Background The Tarim Basin contains abundant coal and coalbed methane (CBM) resources. However, the geological accumulation patterns of CBM in the basin remain poorly understood. This leads to a relative lack of targeted technologies for the exploration and development of both deep coal reservoirs and steeply dipping coal seams, further rendering it challenging to achieve breakthroughs in CBM development in the basin. Methods Based on test data from 92 coal samples, data on the drilling and production tests of more than 10 exploration wells, and 3D seismic interpretation results, this study systematically investigated the distribution of coal-bearing strata, as well as the characteristics, pore structures, gas-bearing properties, and CBM accumulation patterns of coal reservoirs, in the Tarim Basin using techniques including coal petrography, proximate analysis, low-temperature N₂ adsorption, array acoustic logging, and CT scanning. Furthermore, this study quantified the CBM resource potential and determined CBM play fairways in the basin. Results and Conclusions The results indicate that the Tarim Basin exhibits two sets of major coal-bearing strata: the Triassic Taliqike Formation and the Jurassic Yangxia and Kezilenuer formations. The coal reservoirs in the basin are composed primarily of bright and semi-bright coals, which account for 60% to 70% of the total. The reservoirs are rich in vitrinite but depleted in inertinite, with pores dominated by mesopores and micropores. Within the basin, adsorbed gas predominates in shallow parts, accounting for greater than 95%, while adsorbed and free gases coexist in deep parts, representing 82% and 18%, respectively. Four CBM accumulation patterns are identified in the Tarim Basin: the lower source rock-upper reservoir configuration with CBM transported via faults, the in situ, self-sourced pattern in deep parts, the hydraulic sealing pattern in steeply dipping structural zones, and the three-gas coexistence pattern in tectonic slope zones. CBM initially-in-place at burial depths of 2 000 m or less stands at 1.29×10¹² m³, while that at burial depths exceeding 2 000 m amounts to 2.1×10¹² m³. Through five-map superposition, two CBM play fairways are determined: the Dibei gentle slope and the western Kubai Coalfield. Both play fairways jointly cover an area of 370 km² and exhibit CBM initially-in-place of 58.2×10⁹ m³. Among these, the No.3 coal seam of the Kezilenuer Formation in the Dibei gentle slope is selected as the optimal core target owing to its considerable thickness, moderate burial depth, high gas content, and favorable sealing conditions. The results of this study enrich the CBM enrichment theory of medium- to low-rank coal reservoirs, providing a geological basis and technical support for selecting optimal play fairways, conducting well placement, and preparing schemes for layered and segmented CBM exploration and development.

Keywords

coalbed methane (CBM), accumulation pattern, physical property of coal reservoirs, selection of optimal play fairways, Tarim Basin

DOI

10.12363/issn.1001-1986.26.04.0205

Recommended Citation

LIU Honglin, WANG Hongyan, WANG Haichao, et al. (2026) "Differential accumulation of coalbed methane in medium- to low-rank coal seams in a strongly compressional tectonic setting in the Tarim Basin," Coal Geology & Exploration: Vol. 54: Iss. 9, Article 4.
DOI: 10.12363/issn.1001-1986.26.04.0205
Available at: https://cge.researchcommons.org/journal/vol54/iss9/4

Reference

[1] 张泓. 中国西北侏罗纪含煤地层与聚煤规律[M]. 北京: 地质出版社, 1998.

[2] 蔚远江. 准噶尔盆地低煤级煤储层及煤层气成藏初步研究[D]. 北京: 中国地质大学(北京), 2003. YU Yuanjiang. Preliminary study on low-rank coal reservoirs and coalbed methane pool forming in Zhungaer Basin[D]. Beijing: China University of Geosciences (Beijing), 2003.

[3] 刘洪林,王红岩,宁宁,等. 中国大中型盆地煤层气资源[M]. 北京: 石油工业出版社, 2009.

[4] 秦勇. 中国深部煤层气地质研究进展[J]. 石油学报,2023,44(11):1791−1811. QIN Yong. Progress on geological research of deep coalbed methane in China[J]. Acta Petrolei Sinica,2023,44(11):1791−1811.

[5] 李志远,韩生全,徐洋,等. 库拜煤田高陡地层煤层气勘探开发实践探究[J]. 地球科学前沿,2025(8):1123−1129. LI Zhiyuan,HAN Shengquan,XU Yang,et al. Practical exploration and development of coalbed methane in high and steep strata in Kubai coalfield[J]. Advances in Geosciences,2025(8):1123−1129.

[6] 张群,降文萍,姜在炳,等. 我国煤矿区煤层气地面开发现状及技术研究进展[J]. 煤田地质与勘探,2023,51(1):139−158. ZHANG Qun,JIANG Wenping,JIANG Zhaibing,et al. Present situation and technical research progress of coalbed methane surface development in coal mining areas of China[J]. Coal Geology & Exploration,2023,51(1):139−158.

[7] 王迪,田继军,冯烁,等. 塔里木盆地东南缘下—中侏罗统煤层煤岩、煤质特征分析[J]. 现代地质,2018,32(5):975−984. WANG Di,TIAN Jijun,FENG Shuo,et al. Petrography and quality characteristics of Lower-Middle Jurassic coal seam in the southeastern Tarim Basin[J]. Geoscience,2018,32(5):975−984.

[8] 郭泽清,王斌,董才源,等. 塔里木盆地库车坳陷北部构造带侏罗系煤岩气地质特征及有利区带评价[J]. 天然气地球科学,2025,36(5):953−972. GUO Zeqing,WANG Bin,DONG Caiyuan,et al. Geological characteristics of Jurassic coal rock gas and evaluation of favorable zones in the northern structural belt of the Kuqa Depression,Tarim Basin[J]. Natural Gas Geoscience,2025,36(5):953−972.

[9] 贺小标,李鑫,魏永恒,等. 塔里木盆地北缘库拜煤田陡倾斜煤储层纳米孔隙特征及其地质控制[J]. 地质科学,2021,56(3):740−757. HE Xiaobiao,LI Xin,WEI Yongheng,et al. Nano-pore characteristics and their geological control of the steeply inclined coal reservoir in the Cubey coalfield,the northern Tarim Basin[J]. Chinese Journal of Geology (Scientia Geologica Sinica),2021,56(3):740−757.

[10] 杨曙光,徐帆,王刚,等. 新疆阜康区块深部煤储层孔隙结构与分形特征研究[J]. 新疆地质,2025,43(3):544−551. YANG Shuguang,XU Fan,WANG Gang,et al. Study on Pore Structure and Fractal Characteristics of Deep Coal Reservoir in Fukang Block[J]. Xinjiang Geology,2025,43(3):544−551.

[11] 赵亚汶,杨宪彰,唐雁刚,等. 塔里木盆地库车坳陷侏罗系克孜勒努尔组煤岩气地质特征及有利成藏模式[J]. 天然气地球科学,2025,36(9):1692−1705. ZHAO Yawen,YANG Xianzhang,TANG Yangang,et al. Geological characteristics and favorable accumulation model of coal-rock gas of Jurassic Kizilenuer Formation in Kuqa Depression,Tarim Basin[J]. Natural Gas Geoscience,2025,36(9):1692−1705.

[12] 别康,崔瑞康,蔡天,等. 塔里木盆地库车北部坳陷深层煤层游离气含气饱和度计算[J]. 世界石油工业,2025,32(2):37−44. BIE Kang,CUI Ruikang,CAI Tian,et al. Calculation of free gas saturation in deep coal seam of the northern Kuqa tectonic zone,Tarim Basin[J]. World Petroleum Industry,2025,32(2):37−44.

[13] 周梓欣,李瑞明,张伟. 新疆深部煤层气资源勘探潜力[J]. 中国煤炭地质,2018,30(7):28−31. ZHOU Zixin,LI Ruiming,ZHANG Wei. Deep part CBM resource exploration potential in Xinjiang[J]. Coal Geology of China,2018,30(7):28−31.

[14] 高北斗. 塔里木盆地北缘库拜煤田中区煤层气成藏模式研究[D]. 乌鲁木齐: 新疆大学, 2020. GAO Beidou. Study on coalbed methane accumulation model of the middle of Kuqa-bay Coalfield locating in the northern margin of the Tarim Basin[D]. Urumqi: Xinjiang University, 2020.

[15] 陈刚,秦勇,胡宗全,等. 准噶尔盆地白家海凸起深部含煤层气系统储层组合特征[J]. 煤炭学报,2016,41(1):80−86. CHEN Gang,QIN Yong,HU Zongquan,et al. Characteristics of reservoir assemblage of deep CBM-bearing system in Baijiahai dome of Junggar Basin[J]. Journal of China Coal Society,2016,41(1):80−86.

[16] 桑树勋,李瑞明,刘世奇,等. 新疆煤层气大规模高效勘探开发关键技术领域研究进展与突破方向[J]. 煤炭学报,2024,49(1):563−585. SANG Shuxun,LI Ruiming,LIU Shiqi,et al. Research progress and breakthrough directions of the key technical fields for large scale and efficient exploration and development of coalbed methane in Xinjiang[J]. Journal of China Coal Society,2024,49(1):563−585.

[17] 张新民,赵靖舟. 中国煤层气技术可采资源潜力[M]. 北京: 科学出版社, 2010.

[18] 孙钦平,赵群,姜馨淳,等. 新形势下中国煤层气勘探开发前景与对策思考[J]. 煤炭学报,2021,46(1):65−76. SUN Qinping,ZHAO Qun,JIANG Xinchun,et al. Prospects and strategies of CBM exploration and development in China under the new situation[J]. Journal of China Coal Society,2021,46(1):65−76.

[19] 宋岩,刘洪林,柳少波,等. 中国煤层气成藏地质[M]. 北京: 科学出版社, 2010.

[20] 李五忠,田文广,陈刚,等. 不同煤阶煤层气选区评价参数的研究与应用[J]. 天然气工业,2010,30(6):45−47. LI Wuzhong,TIAN Wenguang,CHEN Gang,et al. Research and application of appraisal variables for the prioritizing of coalbed methane areas featured by different coal ranks[J]. Natural Gas Industry,2010,30(6):45−47.

[21] 汤达祯,杨曙光,唐淑玲,等. 准噶尔盆地煤层气勘探开发与地质研究进展[J]. 煤炭学报,2021,46(8):2412−2425. TANG Dazhen,YANG Shuguang,TANG Shuling,et al. Advance on exploration-development and geological research of coalbed methane in the Junggar Basin[J]. Journal of China Coal Society,2021,46(8):2412−2425.

[22] 单衍胜,毕彩芹,张家强,等. 准噶尔盆地南缘探获中侏罗统低煤阶煤层气高产工业气流[J]. 中国地质,2018,45(5):1078−1079. SHAN Yansheng,BI Caiqin,ZHANG Jiaqiang,et al. Productive industrial gas flow obtained in Middle Jurassic low-rank coalbed methane seam in southern Junggar Basin[J]. Geology in China,2018,45(5):1078−1079.

[23] 袁航,鞠玮,张辉,等. 塔里木盆地库车坳陷克拉苏构造带差异构造样式及其对地应力分布的影响[J]. 石油实验地质,2025,47(6):1255−1267. YUAN Hang,JU Wei,ZHANG Hui,et al. Differential structural styles and their influence on in-situ stress distribution in Kelasu tectonic belt,Kuqa Depression,Tarim Basin[J]. Petroleum Geology and Experiment,2025,47(6):1255−1267.

[24] 兰浩,杨兆彪,仇鹏,等. 新疆准噶尔盆地白家海凸起深部煤层气勘探开发进展及启示[J]. 煤田地质与勘探,2024,52(2):13−22. LAN Hao,YANG Zhaobiao,QIU Peng,et al. Exploration and exploitation of deep coalbed methane in the Baijiahai uplift,Junggar Basin: Progress and its implications[J]. Coal Geology & Exploration,2024,52(2):13−22.

[25] 杨兆彪,李存磊,郭巧珍,等. 新疆准噶尔盆地白家海凸起深部煤层气不同赋存态分配规律[J]. 中国矿业大学学报,2025,54(1):127−137. YANG Zhaobiao,LI Cunlei,GUO Qiaozhen,et al. Distribution patterns of various occurrence states of deep coalbed methane in the Baijiahai Uplift,Junggar Basin,Xinjiang[J]. Journal of China University of Mining & Technology,2025,54(1):127−137.

[26] 程明,亢茜,吕惠贤,等. 塔里木盆地中生代古地理[J]. 新疆地质,2025,43(2):201−210. CHENG Ming,KANG Qian,LV Huixian,et al. Mesozoic paleogeography in Tarim Basin[J]. Xinjiang Geology,2025,43(2):201−210.

[27] 李瑞明,周梓欣. 新疆煤层气产业发展现状与思考[J]. 煤田地质与勘探,2022,50(3):23−29. LI Ruiming,ZHOU Zixin. Development status and thoughts on coalbed methane industry in Xinjiang[J]. Coal Geology & Exploration,2022,50(3):23−29.

[28] 刘佳润,刘全有,李朋朋,等. 塔里木盆地库车坳陷煤系天然气贫氦主控因素[J]. 煤田地质与勘探,2025,53(6):109−119. LIU Jiarun,LIU Quanyou,LI Pengpeng,et al. Dominant factors causing helium deficiency in coal-measure natural gas in the Kuqa Depression,Tarim Basin[J]. Coal Geology & Exploration,2025,53(6):109−119.

[29] 汪路南,杨海峰,李瑞明,等. 塔里木盆地北缘阳霞矿区煤层气资源潜力评价[J]. 新疆地质,2025,43(3):558−567. WANG Lunan,YANG Haifeng,LI Ruiming,et al. Evaluation of coalbed methane resource potential in Yangxia mining area,northern margin of Tarim Basin[J]. Xinjiang Geology,2025,43(3):558−567.

[30] 王珂,杨海军,李勇,等. 塔里木盆地库车坳陷北部构造带地质特征与勘探潜力[J]. 石油学报,2021,42(7):885−905. WANG Ke,YANG Haijun,LI Yong,et al. Geological characteristics and exploration potential of the northern tectonic belt of Kuqa Depression in Tarim Basin[J]. Acta Petrolei Sinica,2021,42(7):885−905.

[31] 张金川,孙梦莲,姜心怡,等. 中国陆域非常规天然气资源分布[J]. 世界石油工业,2026,33(1/2):99−129. ZHANG Jinchuan,SUN Menglian,JIANG Xinyi,et al. Distribution of unconventional natural gas resources in China's terrestrial domain[J]. World Petroleum Industry,2026,33(1/2):99−129.

[32] 张丽娟,娄洪,王祥,等. 塔里木盆地库车坳陷侏罗系煤系全油气系统特征与成藏模式[J]. 深地能源科技,2025,1(4):1−14. ZHANG Lijuan,LOU Hong,WANG Xiang,et al. Characteristics of whole petroleum system and hydrocarbon accumulation mode in the Jurassic coal measures in Kuqa Depression,Tarim Basin[J]. Deep Earth Energy Science & Technology,2025,1(4):1−14.

[33] 郭绪杰,支东明,毛新军,等. 准噶尔盆地煤岩气的勘探发现及意义[J]. 中国石油勘探,2021,26(6):38−49. GUO Xujie,ZHI Dongming,MAO Xinjun,et al. Discovery and significance of coal measure gas in Junggar Basin[J]. China Petroleum Exploration,2021,26(6):38−49.

[34] 赵亚汶,谢会文,严德天,等. 库车坳陷侏罗系克孜勒努尔组深部煤层特征及启示[J]. 地质科技通报,2025,44(5):53−64. ZHAO Yawen,XIE Huiwen,YAN Detian,et al. Characteristics and enlightenment of deep coal rocks in the Jurassic Kizilnur Formation of Kuqa Depression[J]. Bulletin of Geological Science and Technology,2025,44(5):53−64.

[35] 马君慧,李鑫,田继军. 库拜煤田西部煤层气资源评价[J]. 西部探矿工程,2023,35(5):162−164. MA Junhui,LI Xin,TIAN Jijun. Evaluation of coalbed methane resources in western Kubai coalfield[J]. West-China Exploration Engineering,2023,35(5):162−164.

[36] 魏强,李贤庆,孙可欣,等. 塔里木盆地库车坳陷克深大气田深层天然气成藏地球化学特征[J]. 天然气地球科学,2019,30(6):897−907. WEI Qiang,LI Xianqing,SUN Kexin,et al. Geochemical characteristics of deep-seated natural gas accumulation of the Keshen large gas field in the Kuqa Depression,Tarim Basin[J]. Natural Gas Geoscience,2019,30(6):897−907.

[37] 张荣虎,杨海军,王俊鹏,等. 库车坳陷超深层低孔致密砂岩储层形成机制与油气勘探意义[J]. 石油学报,2014,35(6):1057−1069. ZHANG Ronghu,YANG Haijun,WANG Junpeng,et al. The formation mechanism and exploration significance of ultra-deep,low-porosity and tight sandstone reservoirs in Kuqa Depression,Tarim Basin[J]. Acta Petrolei Sinica,2014,35(6):1057−1069.

[38] 张荣虎,魏国齐,王珂,等. 前陆冲断带构造逆冲推覆作用与岩石响应特征:以库车坳陷东部中-下侏罗统为例[J]. 岩石学报,2021,37(7):2256−2270. ZHANG Ronghu,WEI Guoqi,WANG Ke,et al. Tectonic thrust nappe activity and sandstone rock response characteristics in foreland thrust belt: A case study of Middle and Lower Jurassic,Kuqa Depression,Tarim Basin[J]. Acta Petrologica Sinica,2021,37(7):2256−2270.

[39] 王德利,张宇航. 新疆库-拜煤田侏罗系塔里奇克组煤的地球化学特征[J]. 中国煤炭地质,2012,24(5):6−9. WANG Deli,ZHANG Yuhang. Jurassic tariqik formation coal geochemical characteristics in Kuqa-bay Coalfield,Xinjiang[J]. Coal Geology of China,2012,24(5):6−9.