Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (3): 162-172.doi: 10.12108/yxyqc.20260314

• NEW ENERGY AND ASSOCIATED RESOURCES • Previous Articles     Next Articles

Characteristics, enrichment conditions and exploration implications of helium-rich gas reservoirs in Chu-Sarysu Basin, Kazakhstan

NIE Minglong1,2(), LIU Haoyuan1, WANG Zhaoming3, ZHAO Shumao2, YU Taiji2   

  1. 1 College of Mining, Liaoning Technical University, Fuxin 123000, Liaoning, China
    2 College of Safety Science and Engineering, Liaoning Technical University, Huludao 125105, Liaoning, China
    3 Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China
  • Received:2025-08-11 Revised:2025-09-16 Online:2026-05-01 Published:2026-02-03

Abstract:

Chu-Sarysu Basin in Kazakhstan is a helium-rich basin. Through the geological characteristic analysis of helium-rich gas reservoirs in different tectonic units and different horizons of the basin, helium enrichment conditions of the basin was discussed, a helium enrichment model jointly controlled by helium sources and caprocks was established, revealing the direction of helium exploration in China. The results show that: (1) Helium has been found in all 5 sets of reservoir-cap combinations in different depressions of Chu-Sarysu Basin, showing the characteristic of helium enrichment throughout the basin. Helium enrichment is positively correlated with nitrogen and has no direct relationship with tectonic units or gas reservoir types, but shows differential enrichment among different horizons. The reservoir-cap combination composed of Lower Carboniferous Serpukhovian limestone-mudstone has the lowest helium content but the highest hydrocarbon gas content. While Permian subsalt sandstones have the highest helium content, with a volume fraction up to 0.68%, and low hydrocarbon gas content. (2) The Precambrian ancient uranium-rich bedrock, tectonic uplift since Triassic, poor source rocks, and multiple sets of caprocks development in the study area are basic conditions for helium enrichment in the basin. Helium coexists with sandstone type uranium deposits, and the development of sandstone type uranium deposits has an indicative effect on helium enrichment. Multiple sets of caprocks, such as salt rocks, gypsum rocks, and mudstones, combined with the small molecular size and strong diffusion capacity of helium, are important reasons for the formation of multi-layered helium enrichment. Meanwhile, the dilution of helium by hydrocarbon carrier gas is also an important factor causing differential helium enrichment in different horizons. (3) The basement and tectonic evolution of Junggar Basin in China are similar to those of Chu-Sarysu Basin. Carboniferous in eastern Junggar, Lunan, Shinan, and Santanghu basins represent promising targets for future helium exploration.

Key words: helium-rich basin, uranium-rich bedrock, sandstone type uranium deposits, Permian, Carbonife-rous, Junggar Basin, Chu-Sarysu Basin, Kazakhstan

CLC Number: 

  • TE02

Fig. 1

Geological and structural outline (a) and stratigraphic column (b) of Chu-Sarysu Basin"

Fig. 2

3 typical geological profiles of Chu-Sarysu Basin"

Table 1

Parameters of helium-rich gas reservoirs in Chu-Sarysu Basin"

气田 构造位置 含气层位 气藏类型 储层
岩性
储层类型 孔隙度/% 渗透率/mD 盖层 单井产量/
(104 m3·d-1
阿曼
格莱特
穆尤恩库
姆坳陷
下二叠统盐间 构造-岩性 砂岩 孔隙型、孔隙-
裂缝型
15.00 0.140 盐岩 18.20
下石炭统下
谢尔普霍夫阶
短轴背斜 灰岩 孔隙型、孔洞-
孔隙型
10.00~14.00 0.001~0.146 泥岩 2.60
下石炭统下
维宪阶—上杜内阶
短轴背斜 灰岩 孔隙型、孔隙-
裂缝型
13.60 0.002 泥岩 21.34
下石炭统下杜内阶 短轴背斜 砂岩 孔隙型、孔隙-
裂缝型
21.60 0.012 泥岩 3.70
艾拉克蒂 穆尤恩库
姆坳陷
下二叠统盐下 短轴背斜 砂岩 孔隙型、裂缝-
孔隙型
0.001 盐岩 12.80
下石炭统下维宪阶 短轴背斜 灰岩 孔隙型、裂缝-
孔隙型
0.002 泥岩 3.13
下石炭统上杜内阶 短轴背斜 砂岩 孔隙型、裂缝-
孔隙型
11.30 0.002 泥岩
阿纳巴依 穆尤恩
库姆坳陷
下石炭统下
谢尔普霍夫阶
短轴背斜 灰岩 孔隙-裂缝型 泥岩 0.20~0.50
下石炭统上维宪阶 短轴背斜 灰岩 孔隙-裂缝型 3.20 泥岩 6.44
上泥盆统法门阶 短轴背斜 砂岩 孔隙-裂缝型 膏岩
莫迪巴依 穆尤恩
库姆坳陷
下石炭统下
谢尔普霍夫阶
短轴背斜 灰岩 溶蚀孔洞型 泥岩
下石炭统下维宪阶 短轴背斜 砂岩 孔隙型、裂缝-
孔隙型
14.40 0.770 泥岩 0.75
普里多
罗日
科克潘
索尔坳陷
下石炭统下
谢尔普霍夫阶
断裂伴生背斜 灰岩 裂缝型 3.80 泥岩 9.60
上泥盆统法门阶 断裂伴生背斜 砂岩 裂缝-孔隙型 0.038 盐岩 7.44
西阿帕克 科克潘
索尔坳陷
下石炭统下
谢尔普霍夫阶
断裂伴生背斜 灰岩 孔隙-孔洞型 3.00~10.00 泥岩 0.20~0.40
上泥盆统法门阶 断裂伴生背斜 砂岩 裂缝-孔隙型 9.00~14.00 膏岩 3.00
奥尔塔
雷克
科克潘
索尔坳陷
下二叠统盐下 短轴背斜 砂岩 孔隙型 1.00~10.20 盐岩 0.55
元古界基岩风化壳 基岩凸起 变质岩 裂缝型 2.00 膏岩 1.60
乌沙拉尔-克姆皮尔托别 塔斯金
隆起
下二叠统 断裂伴生背斜 砂岩 孔隙型、孔隙-
裂缝型
盐岩 18.90
北乌
沙拉尔
塔斯金
隆起
下二叠统 短轴背斜 砂岩 裂缝-孔隙型 4.20 盐岩 4.30~6.10

Table 2

Natural gas components of helium-bearing gas reservoirs in Chu-Sarysu Basin"

构造单元 气藏 层位 ϕ(天然气成分)%
穆尤
恩库姆
坳陷
阿曼
格莱特
下二叠统
盐间
CH4 C2H6 C3H8 C4H10/n-C4H10 C5H12/n-C5H12 C6+ N2+稀有
气体
CO2 H2S He
9.47~26.05 0.21~1.97 0.02~0.49 0.03~0.05或0.07~0.09 0.06~0.16 70.92~87.02 0.15~1.30 0 0.040~
0.240
下石炭统谢尔普霍夫阶 81.45 9.99 3.00 0.38或0.54 1.54 2.90 0.20 0 0
下石炭统下维宪阶—上杜内阶 67.25~86.20 4.52~10.53 2.86~5.20 0.42~0.57或0.82~0.90 0.74~1.12 4.60~14.00 0~
2.22
0 0.190
艾拉
克蒂
下二叠统
盐下
24.00~75.49 1.03~5.15 0.47~1.71 0.06~0.91 0.10~0.76 16.92~72.60 0~
0.45
0 0.170~
0.350
下石炭统下维宪阶—上杜内阶 72.50~81.90 3.46~8.21 1.14~2.77 0.23~1.40 0.40~0.96 7.64~30.90
阿纳
巴依
下石炭统谢尔普霍夫阶 79.14~98.55 1.44~9.77 1.15~4.43 0.18~0.37或0.30~0.72 0.16~0.19或0.12~0.15 0.34~0.36 0.10~
7.52
0~0.70 0.005~
0.070
下石炭统维宪阶 93.83 2.60 0.20 0.03或0.02 0.01 0.01 3.00 0.17 0.40
上泥盆统法门阶 86.43 3.60~4.85 0.37~0.74 0.05或0.06 0.02 4.26~
8.15
0~0.75 0.180~
0.185
莫迪
巴依
下石炭统谢尔普霍夫阶 88.85 4.00 1.10 3.00~16.00 1.15 0 0.085
下石炭统维宪阶 89.00 0.92 0.05 0.02 0.03 0.03 3.00~16.00 0.02~1.80 0 0.270~
0.370
科克
潘索尔
坳陷
普里
多罗日
下石炭统谢尔普霍夫阶 75.40~90.00 0.51~2.06 0.14~0.36 0.02或
0.03~0.21
0.01~0.05 0.01~0.05 7.40~
22.00
0.55~1.25 2.57 0.106~
0.255
上泥盆统法门阶 62.20~70.40 1.20~1.76 0.11~0.12 0.02或
0.01~0.04
0.06 0.06 27.60~34.20 0.30~0.85 0 0.210
西阿
帕克
下石炭统谢尔普霍夫阶 81.30 13.00 6.00 1.60 0.40 0.40 2.70 0.65 0 0.040
上泥盆统法门阶 55.34~86.45 2.75~5.00 0.86~1.70 0.15~0.5或0.15~0.60 0.07~0.21 0.07~0.21 9.00~38.82 0.03 0.110~
0.437
奥尔
塔雷克
下二叠统
盐下
52.80~58.90 0.70~10.90 0.05~0.60 0.01~0.04 0.02~0.07 0.09 40.43~45.20 0.63~1.60 0 0.141~
0.290
基岩 83.70 3.48 0.35 0.08或0.04 11.90 0.30~0.45 0.02 0.208~
0.240
塔斯金
隆起
乌沙拉尔-克姆皮尔托别 下二叠统
盐下
98.86~99.32 0.46 0 0.680
北乌
沙拉尔
下二叠统
盐下
99.20 0.30 0 0.460

Fig. 3

Distribution characteristics of reservoir-cap combinations and helium abundance of helium-bearing gas reservoirs in Chu-Sarysu Basin"

Fig. 4

Correlation between hydrocarbon carrier gas content and helium content of helium-bearing gas reservoirs in Chu-Sarysu Basin"

Fig. 5

Structural map and sections of Usharal-Kempirtobe Gasfield in Chu-Sarysu Basin"

Fig. 6

Structural map and section of north Usharal Gasfield in Chu-Sarysu Basin"

Fig. 7

Coexisting model of multilayer helium and sandstone type uranium deposits in Chu-Sarysu Basin"

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