Application of carbon and hydrogen isotopes in the natural gas origin study
Received date: 2024-04-22
Revised date: 2024-05-08
Online published: 2024-07-25
Supported by
The Guizhou Provincial Science and Technology Projects(Grant No.[2022]ZD005)
the Science and Technology Projects of China National Petroleum Corporation Limited(2021DJ5302)
Different types of natural gas have different carbon and hydrogen isotopic compositions, so the carbon and hydrogen isotopic composition of natural gas is one of the important indicators of natural gas origin identification. With the continuous development of natural gas exploration technology and the continuous growth of exploration data, understanding of the origin and source of natural gas is also deepening, and how to update and verify the existing data to ensure the applicability of natural gas genetic identification figure has become crucial. This study comprehensively analyzes the stable carbon and hydrogen isotope characteristics of different genetic types of natural gases in Sichuan, Tarim, Ordos, Turpan-Hami, Songliao, Northern Jiangsu, Sanshui, Qaidam, and Bohai Bay basins in China, together with abiotic gases from the Lost City of the Middle Atlantic Ridge, and the genetic identification diagrams related to commonly used carbon and hydrogen isotopes are evaluated. The following four conclusions are obtained: (1) The carbon isotopic values of methane (δ13C1), ethane (δ13C2), propane (δ13C3) and butane (δ13C4) of natural gases from China are from -89.4‰ to -11.4‰ (average of -36.6 ‰),-66.0‰ to -17.5‰(average of -29.4‰),-49.5‰ to -13.2‰(average of -27.3‰), -38.5‰ to -16.0‰(average of -25.6‰),respectively. (2) The hydrogen isotopic values of methane (δD1), ethane (δD2) and propane (δD3) of natural gases from China range from -287‰ to -111‰ (average of -177‰), -249‰ to -94‰ (average of -158‰), and -237‰ to -75‰ (average of -146‰), respectively. (3) The carbon and hydrogen isotopic distribution patterns among methane and its homologues of natural gases in China are mainly in positive order (δ13C1<δ13C2<δ13C3<δ13C4, δD1<δD2<δD3). The fractionation amplitude between methane and ethane is greater than that between ethane and propane (Δ(δ13C2-δ13C1)> Δ(δ13C3-δ13C2), Δ(δD2-δD1)>Δ(δD3-δD2)) in most natural gas samples. (4) The δ13C1–δ13C2–δ13C3, the δ13C1–δD1, δ13C1–C1/C2+3, Δ(δ13C2-δ13C1)–Δ(δ13C3-δ13C2) and Δ(δD2-δD1)–Δ(δD3-δD2) charts, can be used to identify the gas origin in many different cases, and the combined application between different charts can enhance the identification effect.
Key words: Natural gas; Carbon isotope; Hydrogen isotope; Genetic identification; Diagram
Yunyan NI , Jinchuan ZHANG , Limiao YAO , Guoliang DONG , Yuan WANG , Li WANG , Jianping CHEN . Application of carbon and hydrogen isotopes in the natural gas origin study[J]. Natural Gas Geoscience, 2024 , 35(11) : 1897 -1909 . DOI: 10.11764/j.issn.1672-1926.2024.05.007
本文在研究过程中,得到中国石油勘探开发研究院戴金星院士的帮助,在此深表感谢。
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