油气藏评价与开发 ›› 2025, Vol. 15 ›› Issue (5): 933-946.doi: 10.13809/j.cnki.cn32-1825/te.2025.05.022

• 非烃能源资源 • 上一篇    

川南长宁地区五峰组—龙马溪组氦气特征及资源潜力分析

于朕翔1,2(), 陈雷1,2,3,4(), 陈鑫5, 刘睿1,2,3, 谭秀成1,2,3,4, 吴帅材1,2, 秦何星1,2, 许强1,2,3,4   

  1. 1.西南石油大学天然气地质四川省重点实验室,四川 成都 610500
    2.中国石油碳酸盐岩储层重点实验室西南石油大学研究分室,四川 成都 610500
    3.西南石油大学地球科学与技术学院,四川 成都 610500
    4.西南石油大学油气藏地质及开发工程全国重点实验室,四川 成都 610500
    5.中国石油西南油气田分公司页岩气研究院,四川 成都 610056
  • 收稿日期:2025-02-14 发布日期:2025-09-19 出版日期:2025-10-26
  • 通讯作者: 陈雷(1985—),男,博士,教授,主要从事非常规油气地质、细粒沉积学、层序地层学研究工作。地址:四川省成都市新都区新都大道8号,邮政编码:610500。E-mail: cl211@126.com
  • 作者简介:于朕翔(2001—),男,在读硕士研究生,从事非常规油气地质研究工作。地址:四川省成都市新都区新都大道8号,邮政编码:610500。E-mail:814018479@qq.com
  • 基金资助:
    国家自然科学基金项目“沉积期水下地貌对海相优质页岩发育的差异控制作用”(42372173)

Helium characteristics and resource potential analysis of Wufeng-Longmaxi Formation in Changning area, southern Sichuan

YU Zhenxiang1,2(), CHEN Lei1,2,3,4(), CHEN Xin5, LIU Rui1,2,3, TAN Xiucheng1,2,3,4, WU Shuaicai1,2, QIN Hexing1,2, XU Qiang1,2,3,4   

  1. 1. Natural Gas Geology Key Laboratory of Sichuan Province, Chengdu, Sichuan 610500, China
    2. Branch of Key Laboratory of Carbonate Reservoirs, Southwest Petroleum University, CNPC, Chengdu, Sichuan 610500, China
    3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    4. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu, Sichuan 610500, China
    5. Shale Gas Research Institute, PetroChina Southwest Oil and Gas field Company, Chengdu, Sichuan 610056, China
  • Received:2025-02-14 Online:2025-09-19 Published:2025-10-26

摘要:

氦气具有低沸点、高热导率和强惰性等特点,在低温超导、保护气、制冷、医疗、电子等领域发挥关键作用,被称为“黄金气体”及“气体稀土”。基于稀有气体同位素测试、微量元素测试等方法对川南长宁地区五峰组—龙马溪组氦气资源进行研究。结果表明: 1)长宁地区五峰组—龙马溪组页岩中U、Th含量较高,质量分数最高分别达65.7×10-6、29.6×10-6,具备较强的生氦潜力样品氦同位素比值(R/Ra≈0.01)及4He/20Ne比值指示,其具有典型壳源氦气特征。背斜构造的前翼、后翼U、Th、K含量相近,但后翼放射性成因氩(40Arrad)含量显著高于前翼,结合4He/40Ar理论值与实测值的差异,推测深部地壳氦气对页岩原生氦产生混合作用,形成壳源近源与远源混合型氦气。2)长宁地区五峰组—龙马溪组页岩氦气主要有2种来源:一是页岩自身从沉积开始至今持续生成的氦气;二是伴随地下流体运移,经由物质交换进入该地层的氦气。3)通过计算得出长宁地区五峰组—龙马溪组页岩在自然演化过程中至今累计生成的氦气量约为4.76×108 m3。基于储层氦气体积分数计算,该地区五峰组—龙马溪组氦气资源量至少为2.86×108 m3。研究成果对进一步开展四川盆地页岩型氦气资源潜力、富集机理与分布规律的研究,实现氦气规模建产,提高氦气保障能力具有重要指导意义。

关键词: 四川盆地, 五峰组—龙马溪组, 页岩, 氦气, 潜力分析

Abstract:

Helium has characteristics such as a low boiling point, high thermal conductivity, and strong inertness. It plays a key role in fields such as low-temperature superconductivity, protective gas, refrigeration, medical treatment, and electronics, and is referred to as the “golden gas” and “rare earth of gas”. In order to analyze the helium characteristics and resource potential of Wufeng-Longmaxi Formation in southern Sichuan province, helium resources of Wufeng-Longmaxi Formation in Changning area of southern Sichuan Province were studied based on rare gas isotope test and trace element test. The results showed that: (1) the uranium (U) and thorium (Th) contents in the shales of the Wufeng-Longmaxi Formation in the Changning area were relatively high, with the highest mass fractions reaching 6.57×10-5 and 2.96×10-5 respectively, indicating a strong potential for helium generation. The helium isotope ratio (R/Ra ≈ 0.01) and the 4He/20Ne ratio of the samples indicated that they had typical crustal helium characteristics. The concentrations of U, Th, and potassium (K) in the front and back limbs of the anticline structure were similar, but the content of radiogenic argon (40Arrad) in the back limb was significantly higher than that in the front limb. Considering the difference between the theoretical and measured values of 4He/40Ar, it was inferred that deep crustal helium had a mixing effect on the primary helium in the shale, forming a crustal helium mixture of near-source and far-source components. (2) There were two main sources of helium in the shale of Wufeng-Longmaxi Formation in Changning area: one was the helium continuously generated by the shale itself since its deposition, and the other was the helium gas that migrated into the Wufeng-Longmaxi Formation with the subsurface fluid through material exchange. (3) Calculations showed that the cumulative amount of helium produced during the natural evolution of the Wufeng-Longmaxi Formation shale in the Changning area was about 4.76×108 m3. The helium resource of Wufeng-Longmaxi Formation in the Changning area was at least 2.86×108 m3 based on the calculation of reservoir helium concentration. The findings of this study provide important guidance for further research on the potential, enrichment mechanisms, and distribution patterns of shale helium resources in the Sichuan Basin, as well as for achieving large-scale helium production and improving helium supply capacity.

Key words: Sichuan Basin, Wufeng-Longmaxi Formation, shale, helium, potential analysis

中图分类号: 

  • TE132