Resource potential and extraction technique design for helium in coal measures

Authors

WANG Lei, PetroChina Coalbed Methane Company Limited, Beijing 100000, ChinaFollow
TANG Maoyin, State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, College of Geoscience and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China

Abstract

Back ground Helium is an important strategic scarce resource. Presently, helium used in industry originates primarily from natural gas. In contrast, helium in coal measures, generally emerging as coalbed methane (CBM) with a high helium content, serves as a vital supplement to conventional helium resources. In industry, helium extraction from boil off gas (BOG) during natural gas liquefaction is recognized as an important way to obtain helium resources. However, existing studies on helium in coal measures mostly focus on the genesis, enrichment patterns, and geochemical characteristics of helium, while there is a lack of studies on its resource characteristics and extraction techniques.Methods This study investigated the helium resources in coal measures in the Sanjiaobei Block along the northeastern margin of the Ordos Basin as an example to analyze the characteristics of regional helium resources. Furthermore, a technique for helium extraction from natural gas in the block was designed based on a existing liquefied natural gas (LNG) plant in the block. Results The results indicate that the Sanjiaobei Block features abundant coal-measure gas but relatively low helium resources. Crust-derived helium is identified in this block, with molar volumetric fractions ranging from 0.01% to 0.30% (average: 0.07%). This establishes the Sanjiaobei Block as the low-helium area. Nevertheless, the helium resources in this block prove stable generally, with geological reserves and cumulative production reaching up to 11.1456 million m³ and 0.7007 million m³, respectively. Therefore, these helium resources can be treated as a feed gas source for helium extraction. This study conducted helium extraction from BOG produced during LNG production. The low-temperature helium extraction technique was selected, for which the two-tower separation technique combining pre-expansion refrigeration and nitrogen cycle refrigeration was employed. The helium extraction process consisted of six units: gas filtration, catalytic dehydrogenation, dehydration and drying, helium extraction, helium charging, and liquid oxygen catalysis. Conclusions The design proposed in this study adopts a nitrogen circulation system (NCS) for efficient refrigeration and optimizes energy recovery, reducing the dependence on direct compression of feed gas. Furthermore, this design provides a stable low-temperature environment that is insensitive to helium concentration fluctuations, enabling the rational and full utilization of BOG gas produced in the plant. This renders the design especially suitable for efficient extraction of low-abundance helium resources produced in the plant. The findings of this study will play a positive and significant role in improving both the technique for helium extraction in coal measures and the economic benefits of relevant enterprises.

Keywords

helium in coal measures, helium resource, helium extraction technique, northeastern margin of the Ordos Basin, Sanjiaobei Block

DOI

10.12363/issn.1001-1986.24.12.0818

Recommended Citation

W T. (2025) "Resource potential and extraction technique design for helium in coal measures," Coal Geology & Exploration: Vol. 53: Iss. 6, Article 10.
DOI: 10.12363/issn.1001-1986.24.12.0818
Available at: https://cge.researchcommons.org/journal/vol53/iss6/10

Reference

[1] 张文，李玉宏，王利，等. 渭河盆地氦气成藏条件分析及资源量预测[J]. 天然气地球科学，2018，29(2)：236−244.

ZHANG Wen，LI Yuhong，WANG Li，et al. The analysis of helium accumulation conditions and prediction of helium resource in Weihe Basin[J]. Natural Gas Geoscience，2018，29(2)：236−244.

[2] ZHANG Wen，LI Yuhong，ZHAO Fenghua，et al. Using noble gases to trace groundwater evolution and assess helium accumulation in Weihe Basin，Central China[J]. Geochimica et Cosmochimica Acta，2019，251：229−246.

[3] 李济远，李玉宏，胡少华，等. “山西式”氦气成藏模式及其意义[J]. 西安科技大学学报，2022，42(3)：529−536.

LI Jiyuan，LI Yuhong，HU Shaohua，et al. “Shanxi–type” helium accumulation model and its essentiality[J]. Journal of Xi’an University of Science and Technology，2022，42(3)：529−536.

[4] 戴金星，李剑，侯路. 鄂尔多斯盆地氦同位素的特征[J]. 高校地质学报，2005，11(4)：473−478.

DAI Jinxing，LI Jian，HOU Lu. Characteristics of helium isotopes in the Ordos Basin[J]. Geological Journal of China Universities，2005，11(4)：473−478.

[5] 张云鹏，李玉宏，卢进才，等. 柴达木盆地北缘富氦天然气的发现：兼议成藏地质条件[J]. 地质通报，2016，35(2/3)：364−371.

ZHANG Yunpeng，LI Yuhong，LU Jincai，et al. The discovery and origin of helium–rich gas on the northern margin of the Qaidam Basin[J]. Geological Bulletin of China，2016，35(2/3)：364−371.

[6] 陶小晚，李建忠，赵力彬，等. 我国氦气资源现状及首个特大型富氦储量的发现：和田河气田[J]. 地球科学，2019，44(3)：1024−1041.

TAO Xiaowan，LI Jianzhong，ZHAO Libin，et al. Helium resources and discovery of first supergiant helium reserve in China：Hetianhe gas field[J]. Earth Science，2019，44(3)：1024−1041.

[7] 徐永昌. 天然气中的幔源稀有气体[J]. 地学前缘，1996，3(3/4)：63−71.

XU Yongchang. The mantle noble gas of natural gases[J]. Earth Science Frontiers，1996，3(3/4)：63−71.

[8] 陶明信，沈平，徐永昌，等. 苏北盆地幔源氦气藏的特征与形成条件[J]. 天然气地球科学，1997，8(3)：1−8.

[9] KINNON E C P，GOLDING S D，BOREHAM C J，et al. Stable isotope and water quality analysis of coal bed methane production waters and gases from the Bowen Basin，Australia[J]. International Journal of Coal Geology，2010，82(3/4)：219−231.

[10] 秦胜飞，赵姿卓，吴伟，等. 煤层气与页岩气含氦性及氦气富集条件[J]. 天然气地球科学，2024，35(5)：890−901.

QIN Shengfei，ZHAO Zizhuo，WU Wei，et al. Helium content and helium enrichment conditions of coalbed methane and shale gas[J]. Natural Gas Geoscience，2024，35(5)：890−901.

[11] 罗政. 贵州煤层中富含氦气及成因探讨[J]. 中国石油和化工标准与质量，2021，41(21)：99−100.

[12] MCINTOSH J，MARTINI A，PETSCH S，et al. Biogeochemistry of the Forest City Basin coalbed methane play[J]. International Journal of Coal Geology，2008，76(1/2)：111−118.

[13] MOORE M T，VINSON D S，WHYTE C J，et al. Differentiating between biogenic and thermogenic sources of natural gas in coalbed methane reservoirs from the Illinois Basin using noble gas and hydrocarbon geochemistry[J]. Geological Society，London，Special Publications，2018，468(1)：151−188.

[14] 陈燕燕，陶士振，杨秀春，等. 页岩气和煤层气中氦气的地球化学特征和富集规律[J]. 天然气地球科学，2023，34(4)：684−696.

CHEN Yanyan，TAO Shizhen，YANG Xiuchun，et al. The geochemical characteristics and enrichment of helium in shale gas and coalbed methane[J]. Natural Gas Geoscience，2023，34(4)：684−696.

[15] HAMAKE J E. Mineral commodity summaries，Helium[D]. Washington D C：United Stated Geological Survey，2017.

[16] HAMEDI H，KARIMI I A，GUNDERSEN T. Optimization of helium extraction processes integrated with nitrogen removal units：A comparative study[J]. Computers & Chemical Engineering，2019，121：354−366.

[17] 李浩玉，罗亮，胡朋伟，等. 天然气提氦联产LNG新工艺特性及适应性分析[J]. 石油与天然气化工，2023，52(5)：64−73.

LI Haoyu，LUO Liang，HU Pengwei，et al. Characteristics and adaptability analysis of a new process of natural gas helium extraction combined with LNG production[J]. Chemical Engineering of Oil & Gas，2023，52(5)：64−73.

[18] 惠洁，康锐，赵伟波，等. 鄂尔多斯盆地氦气特征及生成潜力[J]. 天然气地球科学，2024，35(9)：1688−1698.

HUI Jie，KANG Rui，ZHAO Weibo，et al. Helium characteristics and potential in the Ordos Basin[J]. Natural Gas Geoscience，2024，35(9)：1688−1698.

[19] 杨华，席胜利，魏新善，等. 鄂尔多斯多旋回叠合盆地演化与天然气富集[J]. 中国石油勘探，2006，11(1)：17−24.

YANG Hua，XI Shengli，WEI Xinshan，et al. Evolution and natural gas enrichment of multicycle superimposed basin in Ordos Basin[J]. China Petroleum Exploration，2006，11(1)：17−24.

[20] 杨俊杰，裴锡古. 中国天然气地质学：鄂尔多斯盆地[M]. 北京：石油工业出版社，1996.

[21] 汤达祯，王激流，张君峰，等. 鄂尔多斯盆地东缘煤的二次生烃作用与煤层气的富集[J]. 石油实验地质，2000，22(2)：140−145.

TANG Dazhen，WANG Jiliu，ZHANG Junfeng，et al. Secondary hydrocarbon generation of coal and accumulation of coalbed methane in the east margin of the Ordos Basin[J]. Experimental Petroleum Geology，2000，22(2)：140−145.

[22] 《中国石油天然气的勘查与发现》编辑部. 中国石油天然气的勘查与发现[M]. 北京：地质出版社，1992.

[23] 接铭训. 鄂尔多斯盆地东缘煤层气勘探开发前景[J]. 天然气工业，2010，30(6)：1−6.

JIE Mingxun. Prospects in coalbed methane gas exploration and production in the eastern Ordos Basin[J]. Natural Gas Industry，2010，30(6)：1−6.

[24] 赵志强. 河东煤田三交北煤层气的赋存条件研究[J]. 矿床地质，2012，31(增刊1)：1219−1220.

[25] 刘成林，丁振刚，范立勇，等. 鄂尔多斯盆地含氦天然气地球化学特征与富集影响因素[J]. 石油与天然气地质，2024，45(2)：384−392.

LIU Chenglin，DING Zhengang，FAN Liyong，et al. Geochemical characteristics and enrichment factors of helium–bearing natural gas in the Ordos Basin[J]. Oil & Gas Geology，2024，45(2)：384−392.

[26] 陈新军，丁一，易晶晶，等. 氦气资源的分类、特征及富集主控因素分析[J]. 石油实验地质，2023，45(1)：41−48.

CHEN Xinjun，DING Yi，YI Jingjing，et al. Classified characteristics of helium gas resources and controlling factors for the enrichment[J]. Petroleum Geology & Experiment，2023，45(1)：41−48.

[27] 徐永昌，沈平，陶明信，等. 中国含油气盆地天然气中氦同位素分布[J]. 科学通报，1994，39(16)：1505−1508.

[28] 李玉宏，卢进才，李金超，等. 渭河盆地富氦天然气井分布特征与氦气成因[J]. 吉林大学学报(地球科学版)，2011，41(增刊1)：47−53.

LI Yuhong，LU Jincai，LI Jinchao，et al. Distribution of the helium–rich wells and helium derivation in Weihe Basin[J]. Journal of Jilin University (Earth Science Edition)，2011，41(Sup.1)：47−53.

[29] OZIMA M，PODOSEK F A. Noble gas geochemistry[M]. Cambridge：Cambridge University Press，2001.

[30] WANG Xiaofeng，LIU Wenhui，LI Xiaobin，et al. Radiogenic helium concentration and isotope variations in crustal gas pools from Sichuan Basin，China[J]. Applied Geochemistry，2020，117：104586.

[31] WANG Yang，SUN Zhiming. Crustal composition of China continent constrained from heat flow data and helium isotope ratio of underground fluid[J]. Acta Geologica Sinica (English Edition)，2010，84(1)：178−184.

[32] 刘超，孙蓓蕾，曾凡桂，等. 鄂尔多斯盆地东缘石西区块含氦天然气的发现及成因初探[J]. 煤炭学报，2021，46(4)：1280−1287.

LIU Chao，SUN Beilei，ZENG Fangui，et al. Discovery and origin of helium–rich gas on the Shixi area，eastern margin of the Ordos Basin[J]. Journal of China Coal Society，2021，46(4)：1280−1287.

[33] ZHANG Shangqing，LIU Xuefei，ZHAO Fenghua，et al. Geological and geochemical characteristics of Karst bauxite–bearing sequences in Xiabu area，central Shanxi Province，North China[J]. Journal of Geochemical Exploration，2021，230：106849.

[34] 李均方，何琳琳，柴露华. 天然气提氦技术现状及建议[J]. 石油与天然气化工，2018，47(4)：41−44.

LI Junfang，HE Linlin，CHAI Luhua. Present situation and suggestion of helium extraction from natural gas[J]. Chemical Engineering of Oil & Gas，2018，47(4)：41−44.