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Volume 46 Issue 1
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2024  >  46(1): 124-135
ZHANG Mai, SONG Daofu, WANG Tieguan, HE Faqi, ZHANG Wei, AN Chuan, LIU Yue, LU Zhengang. Geochemical characteristics and sources of natural gas in Hangjinqi area of Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 124-135. doi: 10.11781/sysydz202401124
Citation: ZHANG Mai, SONG Daofu, WANG Tieguan, HE Faqi, ZHANG Wei, AN Chuan, LIU Yue, LU Zhengang. Geochemical characteristics and sources of natural gas in Hangjinqi area of Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(1): 124-135. doi: 10.11781/sysydz202401124
shu

Geochemical characteristics and sources of natural gas in Hangjinqi area of Ordos Basin

doi: 10.11781/sysydz202401124
  • 1.

    National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China

  • 2.

    North China Company, SINOPEC, Zhengzhou, Henan 450000, China

  • Received Date: 2023-10-28
  • Rev Recd Date: 2023-12-14
  • Publish Date: 2024-01-28
    Abstract
  • In order to clarify the differences of characteristics and sources of natural gas in different zones in Hangjinqi area of Ordos Basin, the geochemical composition characteristics of natural gas in three major exploration zones in Hangjinqi area were compared and analyzed in detail by means of gas composition analysis and carbon isotope analysis, and sources of natural gas in different zones were discussed based on the differences in the process of gas accumulation in different zones. The results show that the natural gas of the study area has a high content of hydrocarbon gases (mainly methane), and the drying coefficients are mostly lower than 0.95, suggest-ing that the natural gas is dominated by wet gases. The non-hydrocarbon gases are mainly carbon dioxide and nitrogen, which have lower contents. The carbon isotopes δ13C1, δ13C2 and δ13C3 of natural gas show a positive carbon series distribution, but there are differences among natural gas carbon isotopes compositions in different zones. The δ13C1 value of natural gas in Shiguhao zone is the heaviest, and the δ13C2 and δ13C3 values of natural gas in Xinzhao zone are significantly heavier than that in the other two zones. The genetic analysis results show that the natural gas in the three regions of the study area is of organic genesis, showing the characteristics of coal-type gas (humus-type gas), and the main body is kerogen primary cracking gas, and the source rocks are in the stage of high-mature to over-mature thermal evolution. Combined with the results of gas-source correlation and geological background, it is inferred that the natural gas in Xinzhao zone is mainly derived from the underlying source rocks of Shanxi Formation, and the natural gas in Duguijiahan and Shiguhao zones is sourced from the source rocks of Taiyuan and Shanxi formations in the southern part of the fault, but Taiyuan source rocks contribute more.

     

    • All authors disclose no relevant conflict of interests.
    The study was designed and examined by ZHANG Mai, WANG Tieguan, HE Faqi, ZHANG Wei and AN Chuan. The experimental operation was completed by ZHANG Mai, LIU Yue and LU Zhengang. The manuscript was drafted and revised by ZHANG Mai and SONG Daofu. All the authors have read the last version of paper and consented for submission.
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