鄂尔多斯盆地大吉70井“铁柱子”建立及其地质意义

张伟; 陈东; 丁蓉; 边利恒; 申建; 胡明卿; 李树新; 李星涛; 吴鹏; 朱文涛; 孙雪冬; 马壮; 杨海星

doi:10.3799/dqkx.2026.208

Volume 51 Issue 7

Jul. 2026

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Article Navigation > Earth Science > 2026 > 51(7): 2445-2461

Zhang Wei, Chen Dong, Ding Rong, Bian Liheng, Shen Jian, Hu Mingqing, Li Shuxin, Li Xingtao, Wu Peng, Zhu Wentao, Sun Xuedong, Ma Zhuang, Yang Haixing, 2026. Establishment of 'Iron Pillar' of Well Daji 70 in Ordos Basin and Its Geological Significance. Earth Science, 51(7): 2445-2461. doi: 10.3799/dqkx.2026.208

Citation:

Zhang Wei, Chen Dong, Ding Rong, Bian Liheng, Shen Jian, Hu Mingqing, Li Shuxin, Li Xingtao, Wu Peng, Zhu Wentao, Sun Xuedong, Ma Zhuang, Yang Haixing, 2026. Establishment of "Iron Pillar" of Well Daji 70 in Ordos Basin and Its Geological Significance. Earth Science, 51(7): 2445-2461. doi: 10.3799/dqkx.2026.208

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Establishment of "Iron Pillar" of Well Daji 70 in Ordos Basin and Its Geological Significance

doi: 10.3799/dqkx.2026.208

Zhang Wei^{1, 2
,
,},
Chen Dong^{1, 2},
Ding Rong^{1, 2},
Bian Liheng^{1, 2},
Shen Jian³,
Hu Mingqing^{1, 2},
Li Shuxin^{1, 2},
Li Xingtao^{1, 2},
Wu Peng¹,
Zhu Wentao²,
Sun Xuedong^{1, 2},
Ma Zhuang^{1, 2},
Yang Haixing^{1, 2}

1.
China United Coalbed Methane National Engineering Research Center Co., Ltd., Beijing 100095, China
2.
PetroChina Coalbed Methane Co., Ltd., Beijing 100028, China
3.
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China

Received Date: 2025-01-23
Publish Date: 2026-07-25

Abstract

Abstract

To establish a stratigraphic benchmark for the Carboniferous-Permian formation, Well Daji 70 was deployed and drilled in the Daji area on the eastern margin of the Ordos Basin. This well cored a total of 189 m from 1 843.27 m to 2 032.27 m, achieving a 100% core recovery rate. Through centimeter-scale detailed core description, multi-scale CT scanning, geochemical testing and analysis, combined with geophysical response characteristics, an isochronous stratigraphic framework for the Late Carboniferous to Early Permian on the southeastern margin of the Ordos Basin was constructed. This clarified the spatial configuration of sedimentary systems, laying the foundation for sedimentary environment research. It revealed that the No. 5 and No. 8 coal seams, as well as thin coal seams such as No. 4 and No. 6, are dominated by semi-bright to bright coal with a highly developed natural fracture network (fracture porosity 1.17%-1.19%), effectively supporting the understanding of reservoir formation characterized by "high gas content, high saturation, and high free gas." Additionally, five sets of high-quality shale intervals were identified in the Benxi Formation to Shanxi Formation, providing direct geological evidence for breakthroughs in transitional marine-terrestrial shale gas exploration. The establishment of the "Iron Pillar" in Well Daji 70 not only directly verified and supported the exploration breakthrough of deep coalbed gas in the Daji block but also revealed multiple shale gas replacement layers, offering critical geological evidence and decision-making support for efficient exploration and development in the Ordos Basin.
- Ordos Basin,
- "Iron Pillar" project,
- continuous coring,
- coalbed methane,
- shale gas,
- geological significance,
- petroleum geology

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References(52)

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Establishment of "Iron Pillar" of Well Daji 70 in Ordos Basin and Its Geological Significance

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