Journal of Jilin University(Earth Science Edition) ›› 2022, Vol. 52 ›› Issue (6): 1781-1790.doi: 10.13278/j.cnki.jjuese.20210321

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Genetic Types and Source of Natural Gas of Shahejie Formation in Niuju-Changtan Sag of Eastern Liaohe Depression

Gong Simin1，Jiang Youlu1，Hou Shuai1，Xie Baoguo2，Zhou Yan2   

  1. 1. School of Geosciences, China University of Petroleum(East China), Qingdao 266580, Shandong, China
    2. Research Institute of Exploration and Development of Liaohe Oilfield Company, PetroChina, Panjin 124010, Liaoning, China
  • Received:2021-10-12 Online:2022-11-26 Published:2022-12-27
  • Supported by:
    the National Science and Technology Major Project （2016ZX05006-005）

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Abstract: Based on the composition of natural gas, stable carbon isotope, light hydrocarbons composition characteristics and geological background, the geochemical characteristics, genetic types and sources of natural gas in the Shahejie Formation of Niuju-Changtan sag were analyzed and discussed. The following research results were obtained. First, the natural gas is methane-dominant, and the content of heavy hydrocarbon is relatively high, mainly characterized by wet gas. The non-hydrocarbon gases are mainly N2 and CO2. Second, the δ13C1 value of natural gas is between －42.8‰ and －31.2‰, and the δ13C2 value is between －27.3‰ and －24.7‰. Carbon isotope reverse of natural gas is caused by the mixing of homologous different period gases. Third, organic matter types of gas source rock are mainly humic-prone and humic type. The δ13C-Ro relationship and the maturity-depth relationship curve were used to calibrate the maturity of natural gas. The natural gas in the middle and south of Niuju-Changtan sag is mature coal-type thermal degradation gas, which is derived from the source rocks in and Ess3, while the natural gas in the north is oil-coal pyrolysis gas, which is derived from the source rocks in Esz3 and Esx3.

Key words: Niuju-Changtan sag, gas, geochemical characteristics, genetic type, gas-source correlation

CLC Number: 

  • TE122
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