Geochemical characteristics and exploration potential of Jurassic coal-formed gas in northwest China

Li Jian, Hao Ai-sheng, Qi Xue-ning, Chen Xuan, Guo Jian-ying, Ran Qi-gui, Li Zhi-sheng, Xie Zeng-ye, Zeng Xu, Li Jin, Wang Yu, Liu Ru-hong,

doi:10.11764/j.issn.1672-1926.2019.05.018

Natural Gas Geoscience >

2019 , Vol. 30 >Issue 6: 866 - 879

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.05.018

Geochemical characteristics and exploration potential of Jurassic coal-formed gas in northwest China

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1.Institute of Natural Gas Geology，PetroChina Research Institute of Petroleum Exploration and Development，Langfang065007，China;2.Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang 065007,China;
3.Petroleum Exploration and Development Research Institute,PetroChina Tuha Oilfield Company,Hami 839009,China;
4.University of Chinese Academy of Sciences，Beijing 100049,China

Received date: 2019-05-01

Revised date: 2019-05-28

Online published: 2019-08-05

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Abstract

Jurassic coal-measure strata are widely developed in northwest China,mainly distributed in the Tarim Basin,Junggar Basin,Qaidam Basin and Turpan-Hami Basin.The Jurassic coal-formed gas resources are abundant in northwest China.Although the tectonic and sedimentary environments of Northwest China were similar,the characteristics of Jurassic coal-formed gas in northwest China vary greatly.Therefore,the analysis and summary of the geochemical characteristics of coal-formed gas in Jurassic petroleum systems in different basins is of great significance for searching for searching for different types of coal-formed gases.The drying coefficient of Jurassic coal-formed gas in western China showed three types:“unimodal type of wet gas”,“unimodal type of dry gas” and “bimodal type of dry gas and wet gas”.Carbon isotope values of Jurassic coal-formed methane in northwest China have wide range indicating source rock with maturity of low to over mature stages.The carbon isotope of coal-formed gas in northwest China is generally a positive carbon isotope series,partly with δ¹³C₂-δ1³C₃ inversion.δ¹³C₂-δ¹³C₃ inversion was mainly caused by mixture of gases generated from different maturity or organic matter and bacterial effects.Maturity is the main reason for the great difference of Jurassic coal-formed gas in northwest China,and mixture of gases is also another important factor.The exploration degree of structural gas reservoirs is relatively high.Structural-lithological and lithological gas reservoirs and deep strata are important exploration reservoir types in the Lower Jurassic System in northwest China.Jurassic in Kuqa Depression,Cretaceous to Jurassic in Junggar Basin,mature to high mature Jurassic coal-formed gas in Tuha Basin and high to over mature Jurassic coal-formed gas in Qaidam Basin are potential exploration fields in northwest China.

Key words： Northwest China; Jurassic coal-formed gas; Geochemical Characteristics; Exploration potential

Cite this article

Li Jian, Hao Ai-sheng, Qi Xue-ning, Chen Xuan, Guo Jian-ying, Ran Qi-gui, Li Zhi-sheng, Xie Zeng-ye, Zeng Xu, Li Jin, Wang Yu, Liu Ru-hong, . Geochemical characteristics and exploration potential of Jurassic coal-formed gas in northwest China[J]. Natural Gas Geoscience, 2019 , 30(6) : 866 -879 . DOI: 10.11764/j.issn.1672-1926.2019.05.018

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