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倪云燕(1977-),女,浙江乐清人,博士,研究员,主要从事油气地球化学研究.E-mail:niyunyan@cup.edu.cn. |
收稿日期: 2024-04-22
修回日期: 2024-05-08
网络出版日期: 2024-07-25
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)
不同类型的天然气具有不同的碳氢同位素组成,因此,天然气碳氢同位素组成是天然气成因判识的重要指标之一。随着天然气勘探技术的不断发展和勘探数据的持续增长,对天然气成因与来源的认识也在不断加深,如何更新和验证现有数据,以确保天然气成因判识图版的适用性变得至关重要。综合分析了中国四川、塔里木、鄂尔多斯、吐哈、松辽、苏北、三水、柴达木、渤海湾等盆地以及北大西洋中脊Lost City等地区不同成因类型天然气的碳氢同位素特征与常用的碳氢同位素相关的成因鉴别图版,得到以下4点结论:① 中国天然气甲烷碳同位素(δ13C1)、乙烷碳同位素(δ13C2)、丙烷碳同位素(13C3)、丁烷碳同位素(δ13C4)值分布范围分别为-89.4‰~-11.4‰(均值为-36.6 ‰)、-66.0‰~-17.5‰(均值为-29.4‰)、-49.5‰~-13.2‰(均值为-27.3‰)、-38.5‰~-16.0‰(均值为-25.6‰);② 中国天然气甲烷氢同位素(δD1)、乙烷氢同位素(δD2)、丙烷氢同位素(δD3)值分布范围分别为-287‰~-111‰(均值为-177‰)、-249‰~-94‰(均值为-158‰)、-237‰~-75‰(均值为-146‰);③ 中国天然气甲烷及其同系物之间碳同位素和氢同位素以正序分布为主(δ13C1<δ13C2<δ13C3<δ13C4,δD1<δD2<δD3),且大部分天然气样品甲烷和乙烷之间的碳氢同位素分馏幅度大于乙烷和丙烷之间的碳氢同位素分馏幅度(Δ(δ13C2-δ13C1)> Δ(δ13C3-δ13C2),Δ(δD2-δD1)>Δ(δD3-δD2));④ δ13C1—δ13C2—δ13C3图版、δ13C1—δD1图版、δ13C1—C1/C2+3图版、Δ(δ13C2-δ13C1)—Δ(δ13C3-δ13C2)图版、Δ(δD2-δD1)—Δ(δD3-δD2)图版等都能对天然气进行一定程度的成因鉴别,不同图版之间的联合应用能够加强鉴别效果。
倪云燕 , 张津川 , 姚立邈 , 董国梁 , 王圆 , 王力 , 陈建平 . 碳氢同位素在天然气成因研究中的应用[J]. 天然气地球科学, 2024 , 35(11) : 1897 -1909 . DOI: 10.11764/j.issn.1672-1926.2024.05.007
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
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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