Characteristics and enlightenment of deep coal rocks in the Jurassic Kizilnur Formation of Kuqa Depression

ZHAO Yawen; XIE Huiwen; YAN Detian; WANG Bin; YI Yan; LI Ling; YANG Guo; CHENG Wangming

doi:10.19509/j.cnki.dzkq.tb20240785

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ZHAO Yawen，XIE Huiwen，YAN Detian，et al. Characteristics and enlightenment of deep coal rocks in the Jurassic Kizilnur Formation of Kuqa Depression[J]. Bulletin of Geological Science and Technology，2025，44（5）：51-62 doi: 10.19509/j.cnki.dzkq.tb20240785

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Characteristics and enlightenment of deep coal rocks in the Jurassic Kizilnur Formation of Kuqa Depression

doi: 10.19509/j.cnki.dzkq.tb20240785

ZHAO Yawen^{1
,
,},
XIE Huiwen^{1, 2, 3},
YAN Detian⁴,
WANG Bin^{1, 2, 3},
YI Yan^{1, 2},
LI Ling^{1, 2},
YANG Guo^{1, 2, 3},
CHENG Wangming^{1, 2}

1 .
Tarim Oilfield Company, China National Petroleum Corporation, Korla Xinjiang 841000, China
2 .
R & D Center for Ultra Deep Complex Reservoir Exploration and Development, China National Petroleum Corporation, Korla Xinjiang 841000, China
3 .
Xinjiang Key Laboratory of Ultra-deep Oil and Gas, Korla Xinjiang 841003, China
4 .
School of Earch Resources, China University of Geosciences (Wuhan), Wuhan 430074, Hubei

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Corresponding author: E-mail：zhaoyawen2022@foxmail.com
Received Date: 27 Dec 2024
Accepted Date: 18 Jul 2025
Rev Recd Date: 09 Jul 2025

Available Online: 15 Sep 2025

Abstract

Abstract

Objective
Current research on the Jurassic Kizilnur Formation coal seams in the Kuqa Depression mainly focuses on shallow sections, with limited study of deep coal seams.
Methods
To address unknown coal-rock characteristics, reservoir properties, and gas content in the Jurassic Kizilnur Formation coal seams, the geometric distribution characteristics, the characteristics of coal rock and coal quality, reservoir properties, adsorption properties, and gas content of the coal seam in this block were studied based on the following methods, such as drilling data, seismic data processing, wellbore analysis, sampling observation, gas measurement, pore permeability, and isothermal adsorption experiments.
Results
The deep coal seams in the research area are predominantly composed of primary structures, with vitrinite as the major organic component (average 62.2%), indicating type Ⅲ organic matter. The coal is of medium rank, generally characterized by medium-to-high volatile matter, ultra-low sulfur, and low to very low ash content. The average gas porosity is 7.10%, and the average permeability is 0.685×10⁻³ μm². Furthermore, methane adsorption capacity is strongly influenced by macrinite reflectance, water content, and ash yield. In the Kuqa Depression, deep coal seams occur at burial depths of 2 000 –5 000 m, are mainly distributed in the Northern Structural Zone, cover about 2 800 km², with a maximum single-layer thickness of 22 m. The average gas content of the deep coal seam measured is 11.77 m³/t, indicating substantial resource potential.
Conclusion
Compared with shallow coal seams, the deep coal seams of the Kezilnur Formation in the study area are more strongly affected by burial depth, exhibit high maturation, and have achieved large-scale gas production, underscoring their exploration potential. Water saturation emerges as a critical factor controlling gas content in these seams. Notably, the Dibei gentle-slope platform in the Kuqa Depression offers particular advantages for CBM extraction due to favorable hydrological and geological attributes.
- Kuqa Depression,
- Kizilnur Formation,
- coal seam,
- coal reservoir characteristic

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References

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Characteristics and enlightenment of deep coal rocks in the Jurassic Kizilnur Formation of Kuqa Depression

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Characteristics and enlightenment of deep coal rocks in the Jurassic Kizilnur Formation of Kuqa Depression

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