石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (6): 1546-1554.doi: 10.11743/ogg20230616

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地氦源岩特征及生氦潜力

刘成林1,2(), 丁振刚1,2, 陈践发1,2, 范立勇3, 康锐3, 王海东1,2, 洪思婕1,2, 田安琦1,2, 陈学勇1,2   

  1. 1.中国石油大学（北京） 油气资源与探测国家重点实验室，北京 102249
    2.中国石油大学（北京） 地球科学学院，北京 102249
    3.中国石油 长庆油气田公司 勘探开发研究院，陕西 西安 710018
  • 收稿日期:2023-06-05 修回日期:2023-10-20 出版日期:2023-12-01 发布日期:2023-12-20
  • 第一作者简介:刘成林（1970—），男，教授、博士生导师，天然气成藏和资源评价。E-mail： liucl@cup.edu.cn。
  • 基金项目:
    国家重点研发计划项目(2021YFA071900)

Characteristics and helium-generating potential of helium source rocks in the Ordos Basin

Chenglin LIU1,2(), Zhengang DING1,2, Jianfa CHEN1,2, Liyong FAN3, Rui KANG3, Haidong WANG1,2, Sijie HONG1,2, Anqi TIAN1,2, Xueyong CHEN1,2   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting，China University of Petroleum （Beijing），Beijing 102249，China
    2.College of Geosciences，China University of Petroleum （Beijing），Beijing 102249，China
    3.Exploration and Development Research Institute，Changqing Oilfield Company Ltd. ，PetroChina，Xi’an，Shaanxi 710018，China
  • Received:2023-06-05 Revised:2023-10-20 Online:2023-12-01 Published:2023-12-20

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摘要：

氦源是氦气资源形成的首要条件，盆地基底变质岩、泥岩、泥质白云岩、煤和铝土岩等沉积岩为潜在氦源岩。通过野外地质调查、重磁资料解释、岩心描述与主、微量元素测试等方法，研究了鄂尔多斯盆地2大类5套潜在氦源岩及其成氦潜力。研究结果表明：鄂尔多斯盆地的潜在氦源岩分为基底型和沉积型两大类。基底型氦源岩发育在太古宇陆块及其上叠加的古元古界之中，岩性主要为高级变质片麻岩-变粒岩、大理岩、混合岩和花岗片麻岩，U和Th元素平均丰度分别为3.15×10-6和12.38×10-6，生氦强度为0.735×10-6 cm3/（a·g）。沉积型氦源岩主要发育在中元古界长城系沉积变质岩和古生界沉积岩之中。长城系黑色板岩主要分布在盆地北部和西南部，U和Th平均丰度分别为2.36×10-6和8.28 ×10-6，生氦强度为0.522×10-6 cm3/（a·g）；下古生界下奥陶统马家沟组泥质白云岩分布在盆地中部及东部，U和Th平均丰度分别为1.71×10-6和9.80×10-6，生氦强度为0.487×10-6 cm3/（a·g）；上古生界石炭系-二叠系泥岩和煤在全盆地广泛分布，太原组泥岩U和Th平均丰度分别为9.69×10-6和22.68×10-6，生氦强度为1.82×10-6 cm3/（a·g），太原组煤U和Th平均丰度分别为16.12×10-6和44.13×10-6，生氦强度为3.21×10-6 cm3/（a·g）；上古生界石炭系铝土岩主要分布在盆地东部和西南部，U和Th平均丰度分别为7.14×10-6和38.57×10-6，生氦强度为1.97×10-6 cm3/（a·g）。鄂尔多斯盆地西南部发育各类氦源岩，具有“多源供氦”特征。该研究为鄂尔多斯盆地氦气资源勘查奠定了基础。

关键词: 生氦潜力, 氦源岩, 氦气, 天然气藏, 鄂尔多斯盆地

Abstract:

Helium sources act as the primary element in generating helium resources. Potential helium source rocks encompass basement metamorphic rocks and various sedimentary rocks， such as mudstone， argillaceous dolomite， coal， and bauxite， in basins. Based on field geological surveys， gravity-magnetic data interpretation， core description， and major- and trace-element analyses， we investigate five suites of potential helium source rocks of two categories in the Ordos Basin and their helium-generating potential. The results show that two categories of potential helium source rocks， namely basement metamorphic rocks and sedimentary rocks， are developed in the studied basin. The helium source rocks of the basement type are found in the Archean land block and the superimposed Paleoproterozoic strata， dominated by high-grade metamorphic gneiss， granulite， marble， migmatite， and granitic gneiss， with average abundances of U and Th of 3.15×10-6 and 12.38×10-6， respectively， and a helium-generating intensity of 0.735×10-6 cm3/（a·g）. On the other hand， the helium source rocks of the sedimentary type are primarily found in Changchengian metasedimentary rocks of the Mesoproterozoic strata and the Paleozoic sedimentary rocks. The Changchengian black slate is widely seen in the northern and southwestern Ordos Basin， and exhibits average abundances of U and Th of 2.36×10-6 and 8.28×10-6， respectively， and a helium-generating intensity of 0.522×10-6 cm3/（a·g）. The argillaceous dolomite in the Lower Ordovician Majiagou Formation of the Lower Paleozoic strata， found in the central and eastern Ordos Basin， displays average abundances of U and Th of 1.71×10-6 and 9.80×10-6， respectively， and a helium-generating intensity of 0.487×10-6 cm3/（a·g）. The Carboniferous-Permian mudstones and coals of the Upper Paleozoic strata are extensively distributed throughout the Ordos Basin. The Taiyuan Formation mudstones， among others， show average abundances of U and Th of 9.69×10-6 and 22.68×10-6， respectively， and a helium-generating intensity of 1.82×10-6 cm3/（a·g）， while its coals exhibit average abundances of U and Th of 16.12×10-6 and 44.13×10-6， respectively， and a helium-generating intensity of 3.21×10-6 cm3/（a·g）. The Carboniferous bauxite of the Upper Paleozoic strata， primarily occurring in the eastern and southwestern Ordos Basin， demonstrates average abundances of U and Th of 7.14×10-6 and 38.57×10-6， respectively， and a helium-generating intensity of 1.97×10-6 cm3/（a·g）. Various helium source rocks are discovered in the southwestern Ordos Basin， suggesting a multi-source helium supply. Overall， this study lays the foundation for helium resource exploration in the Ordos Basin.

Key words: helium-generating potential, helium source rock, helium, natural gas reservoir, Ordos Basin

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