石油实验地质2025，Vol.47Issue(5)：1118-1133,16.DOI:10.11781/sysydz2025051118
塔里木盆地顺北地区奥陶系凝析气地球化学特征及成因
Geochemical characteristics and genesis of Ordovician condensate gas in Shunbei area,Tarim Basin
摘要
Abstract
To provide a theoretical basis for deep oil and gas exploration in the Shunbei area of the Tarim Basin,gas component and carbon and hydrogen isotope analyses were used to systematically explore the chemical compo-sition and isotopic characteristics of Ordovician condensate gas in the Shunbei area.These data were compared with those of Ordovician condensate gas from the eastern Lungu,Yuke,and eastern and western Tazhong areas to investigate the genesis and formation process of condensate gas in the Shunbei area.The Ordovician condensate gas in the Shunbei area was mainly composed of hydrocarbon gases.The dryness coefficients of condensate gas in the southern section of No.5 fault zone(F5),F4,and F8 were mostly below 0.95,showing wet gas characteris-tics,while the natural gas in F12,F14,and the Shunnan area was predominantly dry gases.The non-hydrocarbon gases of the condensate gas in the Shunbei area mainly include minor amounts of carbon dioxide,nitrogen,and trace amounts of hydrogen sulfide.The alkane carbon and hydrogen isotope sequences generally exhibited a positive sequence distribution,with isotope reversal occurring in some samples.From the southern section of F5 to the Shunnan area,the maturity of natural gas gradually increased.The Ordovician condensate gas in the Shunbei area was primarily thermogenic oil-type gas.The natural gas in the southern section of F5,F4,and F8 was a mixed source of kerogen-cracking gas and crude oil-cracking gas,with crude oil-cracking gas dominated by wet gas formed in the early stage of cracking.In contrast,the natural gas in F12,F14,and the Shunnan area was mainly crude oil-cracking gas with high maturity,showing dry gas characteristics.Through geochemical analysis of the natural gas,the regional differences in condensate gas genesis in the Shunbei area are revealed,providing a basis for the evaluation and exploration deployment of deep oil and gas resources in the Tarim Basin.关键词
天然气成因/奥陶系/凝析气/顺北地区/塔里木盆地Key words
natural gas genesis/Ordovician/condensate gas/Shunbei area/Tarim Basin分类
能源科技引用本文复制引用
崔福田,马安来,云露,曹自成,李贤庆,黄诚,何帅,郭楚媛..塔里木盆地顺北地区奥陶系凝析气地球化学特征及成因[J].石油实验地质,2025,47(5):1118-1133,16.基金项目
国家自然科学基金项目(42272167)、国家自然科学基金企业联合基金项目(U24B6001)、中国石化科技部项目(P23167,P24173)和中央高校基本科研业务费中国矿业大学(北京)博士研究生拔尖创新人才培育基金(BBJ2024044)联合资助. （42272167）
