Anterior|Próximo

Mecanismo de enriquecimento do gás de carvão no centro e leste da bacia de Ordos e método de previsão de áreas favoráveis

  • role： First author第一作者
  • Affiliation：

    College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China

    State Key Laboratory of Petroleum Resources and Engineering， Beijing 102249， China

  • Email：putycup@163.com
  • Introduction：蒲庭玉（2000—），男，博士研究生，油气藏形成机制与分布规律。E-mail：putycup@163.com。
PU Tingyu12,  
  • role： Corresponding author通信作者
  • Affiliation：

    College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China

    State Key Laboratory of Petroleum Resources and Engineering， Beijing 102249， China

  • Email：pangxq@cup.edu.cn
  • Introduction：庞雄奇（1961—），男，教授、博士研究生导师，油气藏形成机理与分布规律、含油气盆地分析与资源评价。E-mail：pangxq@cup.edu.cn。
PANG Xiongqi12*,  
  • Affiliation：

    College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China

    State Key Laboratory of Petroleum Resources and Engineering， Beijing 102249， China

LIN Hao12,  
  • Affiliation：

    College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China

    State Key Laboratory of Petroleum Resources and Engineering， Beijing 102249， China

CHEN Yuxuan12,  
  • Affiliation：

    College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China

    State Key Laboratory of Petroleum Resources and Engineering， Beijing 102249， China

WANG Lei12,  
  • Affiliation：

    College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China

    State Key Laboratory of Petroleum Resources and Engineering， Beijing 102249， China

ZHANG Ziyin12,  
  • Affiliation：

    College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China

    PetroChina Coalbed Methane Company Limited， Beijing 100028， China

DING Rong13,  
  • Affiliation：

    Research Institute of Petroleum Exploration and Development， PetroChina， Beijing 100083， China

    Unconventional Petroleum Research Institute， China University of Petroleum （Beijing）， Beijing 102249， China

DENG Ze45,  
  • Affiliation：

    Research Institute of Petroleum Exploration and Development， PetroChina， Beijing 100083， China

TIAN Wenguang4,  
  • Affiliation：

    College of Geosciences， China University of Petroleum （Beijing）， Beijing 102249， China

    State Key Laboratory of Petroleum Resources and Engineering， Beijing 102249， China

XIAO Huiyi12

Resumo

A exploração do gás de carvão em camadas profundas da bacia de Ordos alcançou um avanço significativo, abrindo um novo campo de desenvolvimento. Atualmente, ainda existem divergências no entendimento do mecanismo de enriquecimento do gás de carvão profundo e das direções favoráveis para exploração, indicando que a pesquisa do mecanismo de enriquecimento precisa ser aprofundada. Tomando a camada de carvão nº 8 do grupo Benxi do Carbonífero da parte centro-leste da bacia de Ordos como objeto de estudo, foram utilizados análise geológica, análise estatística e a teoria do campo dinâmico de petróleo e gás para explorar as condições de enriquecimento do gás de carvão profundo e a distribuição das áreas favoráveis. O estudo mostra que, na fase evolutiva crítica em que o índice de refletância da vitrinita (Ro) é aproximadamente de 1,5% a 2,5%, as condições de geração, armazenamento, condução e preservação do gás de carvão apresentam características evidentes de sobreposição espaço-temporal, exercendo papel controlador principal na formação e distribuição dos “sweet spots” ricos em gás, manifestados nos seguintes quatro pontos: ① nesta fase, a taxa de geração de gás do carvão é alta e a intensidade de geração forte, estabelecendo a base material para o enriquecimento do gás. ② a porosidade do carvão é anormalmente alta, atingindo um segundo pico em Ro cerca de 2,0%, com volume sincronizado de microporos e macroporos aumentando, fornecendo espaço de armazenamento de alta qualidade para o enriquecimento do gás de carvão. ③ o sistema de fraturas do carvão está altamente desenvolvido, com densidade máxima de fraturas em Ro cerca de 1,9%, formando canais eficientes de condução para o acúmulo e migração do gás de carvão. ④ as rochas encaixantes ao redor do carvão estão em campo dinâmico limitado, criando um bom ambiente de preservação para a formação dos sweet spots ricos em gás. Com base nisso, foi construído um modelo integrado de avaliação das áreas favoráveis ao gás de carvão profundo baseado na caracterização quantitativa dos quatro fatores “geração-armazenamento-condução-preservação”, utilizando método de sobreposição multiparâmetro para classificação e previsão hierárquica das áreas favoráveis dentro da área de estudo. Os resultados da previsão dividem a área em regiões favoráveis de classe I, II e III. Os resultados de perfuração indicam que a proporção de poços com alto teor de gás (conteúdo de gás ≥ 18 m³/t) nas áreas favoráveis da classe I chega a 90%, com teor médio de gás de 24,04 m³/t, e as previsões do modelo estão bem alinhadas com os resultados reais da exploração. Os resultados do estudo fornecem base teórica confiável e suporte técnico para a seleção otimizada de áreas favoráveis ao gás de carvão profundo na bacia de Ordos e para o planejamento de explorações futuras, sendo de grande importância para melhorar a eficiência do desenvolvimento de recursos e garantir a segurança energética nacional.

Palavras-chave

Estrutura porosa; Sistema completo de óleo e gás; Previsão de áreas favoráveis; Enriquecimento de óleo e gás; Gás de carvão; Bacia de Ordos

References

  1. 1.
    ZOU Caineng， ZHAO Qun， LIU Hanlin， et al. China’s breakthrough in coal-rock gas and its significance［J］. Natural Gas Industry， 2025， 45（4）： 1-18.
  2. 2.
    LI Yong， XU Fengyin， TANG Shuheng， et al. Progress and development direction of coalbed methane （coal-rock gas） exploration and development in the Ordos Basin［J］. Natural Gas Industry， 2024， 44（10）： 63-79.
  3. 3.
    LI Guoxin， CHEN Ruiyin， WEN Zhixin， et al. Global coal-rock gas resource potential and distribution［J］. Petroleum Exploration and Development， 2026， 53（1）： 14-26.
  4. 4.
    ZHANG Lei， LI Xuefeng， ZHANG Jikun， et al. Development progress， challenges， and strategies for CBM/CRG in the eastern margin of the Ordos Basin［J］. Natural Gas Industry， 2026， 46（1）： 41-51.
  5. 5.
    LI Yong， ZOU Caineng， WANG Mingwei， et al. Formation， distribution， enrichment pattern and development prospect of coal-rock gas worldwide［J］. Natural Gas Industry， 2026， 46（1）： 24-40.
  6. 6.
    NIU Xiaobing， FAN Liyong， YAN Xiaoxiong， et al. Enrichment conditions and resource potential of coal-rock gas in Ordos Basin， NW China［J］. Petroleum Exploration and Development， 2024， 51（5）： 972-985.
  7. 7.
    MILKOV A V， ETIOPE G. Revised genetic diagrams for natural gases based on a global dataset of > 20 000 samples［J］. Organic Geochemistry， 2018， 125： 109-120.
  8. 8.
    DAI Jinxing. Coal-derived gas theory and its discrimination［J］. Chinese Science Bulletin， 2018， 63（14）： 1290-1305， 1290.
  9. 9.
    QIN Yong， SHEN Jian， WANG Baowen， et al. Accumulation effects and coupling relationship of deep coalbed methane［J］. Acta Petrolei Sinica， 2012， 33（1）： 48-54.
  10. 10.
    SHEN Jian， QIN Yong， FU Xuehai， et al. Properties of deep coalbed methane reservoir-forming conditions and critical depth discussion［J］. Natural Gas Geoscience， 2014， 25（9）： 1470-1476.
  11. 11.
    LI Mingrui， SHI Yunhe， FAN Liyong， et al. Comparison of main reservoir characteristics between deep coal-rock gas of the No.8 coal seam of the Upper Paleozoic Benxi Formation and tight sand gas reservoirs， Ordos Basin［J］. Oil & Gas Geology， 2024， 45（6）： 1590-1604.
  12. 12.
    ZHOU Lihong， CHEN Changwei， HAN Guomeng， et al. Geological characteristics， favorable accumulation factors， and developmental models of deep coal-rock gas in complex fault-bounded basins： A case study of the Dagang exploration area in the Bohai Bay Basin［J］. Oil & Gas Geology， 2024， 45（6）： 1665-1677.
  13. 13.
    LI Guoxin， ZHANG Junfeng， ZHAO Qun， et al. Evaluation methodology of coal-rock gas resources and exploration potential of favorable areas in onshore China［J］. Petroleum Exploration and Development， 2025， 52（6）： 1231-1245.
  14. 14.
    ZHAO Zhenyu， GUO Yanru， WANG Yan， et al. Study progress in tectonic evolution and paleogeography of Ordos Basin［J］. Special Oil & Gas Reservoirs， 2012， 19（5）： 15-20.
  15. 15.
    YANG Hua， FU Jinhua， LIU Xinshe， et al. Accumulation conditions and exploration and development of tight gas in the Upper Paleozoic of the Ordos Basin［J］. Petroleum Exploration and Development， 2012， 39（3）： 295-303.
  16. 16.
    JIE Mingxun. Prospects in coalbed methane gas exploration and production in the eastern Ordos Basin［J］. Natural Gas Industry， 2010， 30（6）： 1-6.
  17. 17.
    ZHAO Zhe， XU Wanglin， ZHAO Zhenyu， et al. Geological characteristics and exploration breakthroughs of coal rock gas in Carboniferous Benxi Formation， Ordos Basin， NW China［J］. Petroleum Exploration and Development， 2024， 51（2）： 234-247， 259.
  18. 18.
    GUO Yanqin， LI Wenhou， GUO Bincheng， et al. Sedimentary systems and palaeogeography evolution of Ordos Basin［J］. Journal of Palaeogeography （Chinese Edition）， 2019， 21（2）： 293-320.
  19. 19.
    ZHANG Rui， LIU Shimin. Experimental and theoretical characterization of methane and CO2 sorption hysteresis in coals based on Langmuir desorption［J］. International Journal of Coal Geology， 2017， 171： 49-60.
  20. 20.
    LI Yong， GAO Shuang， WU Peng， et al. Evaluation and correction of prediction model for free gas content in deep coalbed methane： A case study of deep coal seams in the eastern margin of Ordos Basin［J］. Acta Petrolei Sinica， 2023， 44（11）： 1892-1902.
  21. 21.
    JIA Chengzao， PANG Xiongqi， SONG Yan. The mechanism of unconventional hydrocarbon formation： Hydrocarbon self-containment and intermolecular forces［J］. Petroleum Exploration and Development， 2021， 48（3）： 437-452.
  22. 22.
    JIA Chengzao， PANG Xiongqi， SONG Yan. Whole petroleum system and ordered distribution pattern of conventional and unconventional oil and gas reservoirs［J］. Petroleum Science， 2023， 20（1）： 1-19.
  23. 23.
    PANG Xiongqi， JIA Chengzao， WANG Wenyang， et al. Buoyance-driven hydrocarbon accumulation depth and its implication for unconventional resource prediction［J］. Geoscience Frontiers， 2021， 12（4）： 101133.
  24. 24.
    PANG Xiongqi， HU Tao， LARTER S， et al. Hydrocarbon accumulation depth limit and implications for potential resources prediction［J］. Gondwana Research， 2022， 103： 389-400.
  25. 25.
    PANG Xiongqi， JIA Chengzao， ZHANG Kun， et al. The dead line for oil and gas and implication for fossil resource prediction［J］. Earth System Science Data， 2020， 12（1）： 577-590.
  26. 26.
    PANG Xiongqi， LIU Keyu， MA Zhongzhen， et al. Dynamic field division of hydrocarbon migration， accumulation and hydrocarbon enrichment rules in sedimentary basins［J］. Acta Geologica Sinica-English Edition， 2012， 86（6）： 1559-1592.
  27. 27.
    GUO Xusheng， HUANG Renchun， ZHANG Dianwei， et al. Hydrocarbon accumulation and orderly distribution of whole petroleum system in marine carbonate rocks of Sichuan Basin， SW China［J］. Petroleum Exploration and Development， 2024， 51（4）： 743-758.
  28. 28.
    JIA Chengzao， JIANG Lin， ZHAO Wen. Tight oil and gas in Whole Petroleum System： Accumulation mechanism， enrichment regularity， and resource prospect［J］. Acta Petrolei Sinica， 2025， 46（1）： 1-16， 47.
  29. 29.
    PANG Xiongqi， JIA Chengzao， XU Zhi， et al. Application of the whole petroleum system in the evaluation of the global natural gas hydrate resource［J］. Petroleum Exploration and Development， 2025， 52（2）： 267-278.
  30. 30.
    PANG Xiongqi. Quantitative evaluation of the whole petroleum system： hydrocarbon thresholds and their application［M］. Singapore： Springer， 2023.
  31. 31.
    ZHI Dongming， LI Jianzhong， YANG Fan， et al. Whole petroleum system in Jurassic coal measures of Taibei Sag in Tuha Basin， NW China［J］. Petroleum Exploration and Development， 2024， 51（3）： 453-466.
  32. 32.
    LI Guoxin， JIA Chengzao， ZHAO Qun， et al. Coal-rock gas accumulation mechanism and the whole petroleum system of coal measures［J］. Petroleum Exploration and Development， 2025， 52（1）： 29-43.
  33. 33.
    DING Rong， PANG Xiongqi， JIA Chengzao， et al. Methods， principles and case study of evaluating deep coalbed methane based on Whole Petroleum System theory［J］. Acta Petrolei Sinica， 2025， 46（3）： 532-546.
  34. 34.
    ZHOU Lihong， YAN Xia， XIONG Xianyue， et al. Characteristics of occurrence and distribution rule of deep coalbed methane in supercritical state［J］. Coal Science and Technology， 2025， 53（3）： 73-90.
  35. 35.
    LIU Dameng， YAO Yanbin， CAI Yidong， et al. Characteristics of porosity and permeability and their geological control of Permo-Carboniferous coals in North China［J］. Geoscience， 2010， 24（6）： 1198-1203.
  36. 36.
    SHAO Pei， WANG Xiao， SONG Yu， et al. Study on the characteristics of matrix compressibility and its influence factors for different rank coals［J］. Journal of Natural Gas Science and Engineering， 2018， 56： 93-106.
  37. 37.
    LI Yong. Coal structure evolution and its fuel， raw material and functional material properties development［J］. Journal of China Coal Society， 2022， 47（11）： 3936-3951.
  38. 38.
    HUANG Daojun， ZHOU Guoxiao， YANG Zhaobiao， et al. Geochemical characterization of gas-water output from deep coalrock methane wells in the Ordos Basin and its geological responses［J］. Oil & Gas Geology， 2024， 45（6）： 1617-1627.
  39. 39.
    HOU Yuting， YU Jian， ZHANG Chunyu， et al. Geological characteristics and exploration prospects of deep coalbed methane enriched in Carboniferous Benxi Formation， Ordos Basin［J］. Acta Petrolei Sinica， 2025， 46（5）： 857-874.
  40. 40.
    HE Xueqiu， LIU Xianfeng， NIE Baisheng， et al. FTIR and Raman spectroscopy characterization of functional groups in various rank coals［J］. Fuel， 2017， 206： 555-563.
  41. 41.
    REN Zhanli， QI Kai， LIU Runchuan， et al. Dynamic background of Early Cretaceous tectonic thermal events and its control on various mineral accumulations such as oil and gas in the Ordos Basin［J］. Acta Petrologica Sinica， 2020， 36（4）： 1213-1234.
  42. 42.
    REN Zhanli， QI Kai， LI Jinbu， et al. Thermodynamic evolution and hydrocarbon accumulation in the Ordos Basin［J］. Oil & Gas Geology， 2021， 42（5）： 1030-1042.
  43. 43.
    ZHOU Lihong， LI Yong， DING Rong， et al. Differential accumulation characteristics and production of coalbed methane/coal-rock gas： A case study of the No. 8 coal seam of the Carboniferous Benxi Formation in the Daji block， Ordos Basin， NW China［J］. Petroleum Exploration and Development， 2025， 52（4）： 772-781.
  44. 44.
    JIA Jianchen， ZHANG Hong， JIA Qian， et al. Status and prospect： study on the cleat system in coal reservoir［J］. Natural Gas Geoscience， 2015， 26（9）： 1621-1628.
  45. 45.
    LAUBACH S E， MARRETT R A， OLSON J E， et al. Characteristics and origins of coal cleat： a review［J］. International Journal of Coal Geology， 1998， 35（1/4）： 175-207.
  46. 46.
    WANG Qing， TIAN Chong， LUO Chao， et al. Characteristics and exploration prospects of coal-rock gas reservoirs in Permian Longtan Formation in Suining-Hejiang area， Sichuan Basin［J］. Lithologic Reservoirs， 2025， 37（4）： 26-37.
  47. 47.
    FAN Mingzhu， WANG Shuhua. Study on the cleats in coalbed methane development［J］. Coal Geology & Exploration， 1997， 25（1）： 29-32.
  48. 48.
    TIAN Fenghua， LI Xiaogang， ZHU Wentao， et al. Evaluation of 3D characteristics and optimization of fracturing sections for No.8 coal seam crack in Daning-Ji County block［J］. China Energy and Environmental Protection， 2023， 45（9）： 88-95.
  49. 49.
    GUO Yingchun， PANG Xiongqi， LI Zongxing， et al. The critical buoyancy threshold for tight sandstone gas entrapment： Physical simulation， interpretation， and implications to the Upper Paleozoic Ordos Basin［J］. Journal of Petroleum Science and Engineering， 2017， 149： 88-97.
  50. 50.
    HUANG Weigang， HU Fu， LIU Nanqin. Study on surfactant wettability for coal dust［J］. Mining Safety & Environmental Protection， 2010， 37（3）： 4-6， 10.
  51. 51.
    HOU Wei， XU Fengyin， ZHANG Lei， et al. Influence of coal lithotypes on adsorption/desorption characteristics in coal reservoirs and its practical significance： A case study in Baode Block［J］. Coal Geology & Exploration， 2022， 50（3）： 110-118.
  52. 52.
    ZHANG Ziying， TIAN Wenguang， PANG Xiongqi， et al. The critical conditions of Upper-Paleozoic hydrocarbon dynamic field in the central and eastern Ordos Basin［J］. Natural Gas Geoscience， 2026， 37（4）： 687-704.
  53. 53.
    PANG Xiongqi， ZHU Weilin， LYU Xiuxiang， et al. A study on hydrocarbon thresholds controlling reservoir accumulation and predictive evaluation of favorable accumulation areas in eastern Bohai Bay Basin［J］. Acta Petrolei Sinica， 2015， 36（S2）： 1-18.
  54. 54.
    MENG Weigong， PANG Xiongqi， LI Xiaoguang， et al. Reservoir distribution threshold and prediction of favorable hydrocarbon accumulation zones in Liaohe Depression［J］. Acta Petrolei Sinica， 2015， 36（S2）： 36-50， 59.
  55. 55.
    ZHAO Danfeng. The accumulation characteristics of tight gas reservoirs in the Upper Palaeozoic of eastern Ordos Basin［D］. Xi’an： Xi’an Shiyou University， 2013.

Leia o texto completo

The above content is generated by Large Model Translation. The translated content is for reference only. We do not assume any commercial or legal responsibilty for any consequences arising from the use of our website