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Comparison of Geochemical Characteristics of Light Hydrocarbons (C5—C7) in Headspace Gas of Oil and Natural Gas in the Qaidam Basin
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Chen ZHANG1, Ke-fei CHEN2, Shi-xin ZHOU3, 4, *, Jing LI3, 4, Dao-yong ZHANG1, Wen-li JIANG1, Ji-hong REN1, Hai-xiao GUO1
Science Technology and Engineering | 2025, 25(12) : 4881 - 4888
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Science Technology and Engineering | 2025, 25(12): 4881-4888
• Papers·Astronomy and Geosciences •
Comparison of Geochemical Characteristics of Light Hydrocarbons (C5—C7) in Headspace Gas of Oil and Natural Gas in the Qaidam Basin
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Chen ZHANG1, Ke-fei CHEN2, Shi-xin ZHOU3, 4, *, Jing LI3, 4, Dao-yong ZHANG1, Wen-li JIANG1, Ji-hong REN1, Hai-xiao GUO1
Affiliations
  • 1 Strategic Research Center of Oil and Gas Resources, Ministry of Natural Resources, Beijing 100034, China
  • 2 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • 3 Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
  • 4 Key Laboratory of Petroleum Resources Research, Gansu Province, Lanzhou 730000, China
Published: 2025-04-28 doi: 10.12404/j.issn.1671-1815.2403831
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To determine the accuracy of the light hydrocarbon parameter obtained from the headspace gas, crude oils and associated gases from six wells in the western part of the Qaidam Basin were collected. The composition and carbon isotopes of individual light hydrocarbons from headspace gas and natural gas were analyzed and compared. The results show that the content of C5—C7 light hydrocarbons obtained from headspace gas is higher than that in natural gas, but the relative contents of each light hydrocarbon obtained from two methods are similar. It is found that light hydrocarbon parameters calculated from headspace gas and natural gas share similar results in studying the genesis type, generation temperature and other aspects, but get different results in evaluating the maturity by using heptane and isoheptane values. Besides, the carbon isotopes of individual light hydrocarbons in headspace gas are greater than those in natural gas, among which cyclo-alkanes have the smallest carbon isotope difference. Particularly, the carbon isotopes of methylcyclohexane (δ13CMCC6) in the headspace gas are close to those in natural gas. Therefore, the main parameters of light hydrocarbons and δ13CMCC6 can be accurately obtained from the headspace gas of crude oil. The research results provide a basis for enriching the application of light hydrocarbon geochemistry in oil and gas accumulation.

natural gas  /  technology of headspace gas  /  C5—C7 light hydrocarbons  /  carbon isotopes of individual hydrocarbons
Chen ZHANG, Ke-fei CHEN, Shi-xin ZHOU, Jing LI, Dao-yong ZHANG, Wen-li JIANG, Ji-hong REN, Hai-xiao GUO. Comparison of Geochemical Characteristics of Light Hydrocarbons (C5—C7) in Headspace Gas of Oil and Natural Gas in the Qaidam Basin[J]. Science Technology and Engineering, 2025 , 25 (12) : 4881 -4888 . DOI: 10.12404/j.issn.1671-1815.2403831
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Year 2025 volume 25 Issue 12
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Article Info
doi: 10.12404/j.issn.1671-1815.2403831
  • Receive Date：2024-05-23
  • Online Date：2025-07-09
  • Published：2025-04-28
Article Data
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History
  • Received：2024-05-23
  • Revised：2025-01-31
Funding
Affiliations
    1 Strategic Research Center of Oil and Gas Resources, Ministry of Natural Resources, Beijing 100034, China
    2 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
    3 Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
    4 Key Laboratory of Petroleum Resources Research, Gansu Province, Lanzhou 730000, China
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表12种不同金属材料的力学参数
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小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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