中国大气田烷烃气碳同位素组成的若干特征  

Characteristics of carbon isotopic composition of alkane gas in large gas fields in China

作　　者：戴金星[1] 倪云燕 龚德瑜 黄士鹏[1] 刘全有 洪峰[1] 张延玲[1] DAI Jinxing;NI Yunyan;GONG Deyu;HUANG Shipeng;LIU Quanyou;HONG Feng;ZHANG Yanling(PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China;China University of Petroleum(Beijing),Beijing 102249,China;Peking University,Beijing 100871,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大学(北京),北京102249 [3]北京大学,北京100871

出　　处：《石油勘探与开发》2024年第2期223-233,共11页Petroleum Exploration and Development

基　　金：国家自然科学基金(41472120);国家自然科学基金项目面上项目(42272188);中国石油油气和新能源分公司科技专项(2023YQX10101);国家自然科学基金石化联合基金集成项目(U20B6001)。

摘　　要：勘探开发大气田是一个国家快速发展天然气工业的重要途径。1991年至2020年,中国新探明大气田68个,促进2020年产气1925×10^(8)m^(3),成为世界第4产气大国。基于中国70个大气田的1696个气样组分和烷烃气碳同位素组成数据,获得中国大气田烷烃气碳同位素组成特征:①δ^(13)C_(1)、δ^(13)C_(2)、δ^(13)C_(3)和δ^(13)C_(4)的最轻值和平均值,随分子中碳数逐增而变重,而δ^(13)C_(1)、δ^(13)C_(2)、δ^(13)C_(3)和δ^(13)C_(4)的最重值,随分子中碳数逐增而变轻。②中国大气田δ^(13)C_(1)值的分布区间为−71.2‰~−11.4‰,其中生物气δ^(13)C_(1)值的分布区间为−71.2‰~−56.4‰;油型气δ^(13)C_(1)值的分布区间为−54.4‰~−21.6‰;煤成气δ^(13)C_(1)值的分布区间为−49.3‰~−18.9‰;无机成因气δ^(13)C_(1)值的分布区间为−35.6‰~−11.4‰;根据这些数据编制了中国大气田的δ^(13)C_(1)值尺图。③中国天然气δ^(13)C_(1)值的分布区间为−107.1‰~−8.9‰,其中生物气δ^(13)C_(1)值为−107.1‰~−55.1‰;油型气δ^(13)C^(1)值为−54.4‰~−21.6‰;煤成气δ^(13)C_(1)值为−49.3‰~−13.3‰;无机成因气δ13C1值为−36.2‰~−8.9‰;根据上述数据编制了中国天然气的δ^(13)C_(1)值尺图。Exploration and development of large gas fields is an important way for a country to rapidly develop its natural gas industry.From 1991 to 2020,China has discovered 68 new large gas fields,boosting its annual gas output to 1925×108 m3 in 2020,making it the fourth largest gas producing country in the world.Based on 1696 molecular components and carbon isotopic composition data of alkane gas in 70 large gas fields in China,the characteristics of carbon isotope composition of alkane gas in large gas fields in China were obtained.The lightest and average values ofδ^(13)C_(1),δ^(13)C_(2),δ^(13)C_(3)andδ13C4 become heavier with increasing carbon number,while the heaviest values ofδ^(13)C_(1),δ^(13)C_(2),δ^(13)C_(3)andδ13C4 become lighter with increasing carbon number.Theδ^(13)C_(1)values of large gas fields in China range from-71.2‰to-11.4‰(specifically,from-71.2‰to-56.4‰for bacterial gas,from-54.4‰to-21.6‰for oil-related gas,from-49.3‰to-18.9‰for coal-derived gas,and from-35.6‰to-11.4‰for abiogenic gas).Based on these data,theδ^(13)C_(1)chart of large gas fields in China was plotted.Moreover,theδ^(13)C_(1)values of natural gas in China range from-107.1‰to-8.9‰,specifically,from-107.1‰to-55.1‰for bacterial gas,from-54.4‰to-21.6‰for oil-related gas,from-49.3‰to-13.3‰for coal-derived gas,and from-36.2‰to-8.9‰for abiogenic gas.Based on these data,theδ^(13)C_(1)chart of natural gas in China was plotted.

关 键 词：中国 大气田 生物气 油型气 煤成气 无机成因气 烷烃气 碳同位素组成 δ_(13)C^(1)值尺 

分 类 号：TE122[石油与天然气工程—油气勘探]