岩性油气藏 ›› 2025, Vol. 37 ›› Issue (6): 71–87.doi: 10.12108/yxyqc.20250607

• 地质勘探 • 上一篇    

准噶尔盆地达巴松凸起三叠系白碱滩组油气地球化学特征及来源

江梦雅, 蒋中发, 刘龙松, 王江涛, 陈海龙, 王学勇, 刘海磊   

  1. 中国石油新疆油田公司 勘探开发研究院, 新疆 克拉玛依 834000
  • 收稿日期:2025-05-15 修回日期:2025-08-06 发布日期:2025-11-07
  • 第一作者:江梦雅（1995—），女，硕士，工程师，主要从事石油地质综合研究方面的工作。地址：（834000）新疆克拉玛依准噶尔路32号。Email：jiang-my@petrochina.com.cn。
  • 基金资助:
    中国石油油气和新能源分公司科技专项“风险勘探领域和目标研究、工程技术攻关及现场试验”下属课题“准噶尔盆地风险勘探领域和目标研究、工程技术攻关及现场试验”（编号：2023YQX10106）资助。

Hydrocarbon geochemical characteristics and source of Triassic Baijiantan Formation in Dabasong uplift, Junggar Basin

JIANG Mengya, JIANG Zhongfa, LIU Longsong, WANG Jiangtao, CHEN Hailong, WANG Xueyong, LIU Hailei   

  1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2025-05-15 Revised:2025-08-06 Published:2025-11-07

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摘要： 准噶尔盆地达巴松凸起三叠系白碱滩组钻遇规模优质砂体，并获工业油气流，展现出达巴松凸起中浅层油气资源具有较大潜力。基于新钻井取出的油气样品的分析资料，系统解析了盆北1井区白碱滩组的油气地球化学特征，揭示了油气来源。研究结果表明：①准噶尔盆地达巴松凸起盆北1井区白碱滩组原油黏度及凝固点相对较高。全油碳同位素偏轻，为-29.38‰，Pr/Ph为0.69~1.29，含β-胡萝卜烷和伽马蜡烷，为成熟—高成熟轻质原油。②研究区盆北1井区白碱滩组天然气成分中甲烷占优势，湿气—干气并存，乙烷碳同位素偏轻，为-31.34‰~-27.83‰，C7轻烃化合物中二甲基环戊烷占比较大，油型气、混合气均有分布。③盆北1井区白碱滩组原油主要来源于二叠系风城组烃源岩，还原环境中的低等水生生物贡献较多；天然气主要来源于二叠系风城组烃源岩，部分来源于石炭系烃源岩。④盆北1井区白碱滩组油气藏为双源供烃、多期油气充注、受沉积相带控制、断裂分割的岩性或断层-岩性油气藏。

关键词: 原油特征, 天然气特征, 油气源对比, 白碱滩组, 三叠系, 达巴松凸起, 准噶尔盆地

Abstract: Triassic Baijiantan Formation of Dabasong uplift in Junggar Basin has encountered large-scale highquality sand bodies and achieved industrial oil and gas flow, which show that oil and gas resources in the middle and shallow layers of Dabasong uplift have significant potential. Based on the analysis data of oil and gas samples from newly drilled wells, the hydrocarbon geochemical characteristics of Baijiantan Formation in Penbei 1 well area were systematically analyzed, and the sources of oil and gas were revealed. The results show that: (1) The crude oil of Baijiantan Formation in Penbei 1 well area of Dabasong uplift in Junggar Basin has relatively high viscosity and freezing point. The whole oil carbon isotope is relatively light, with the value of -29.38‰, and Pr/Ph of 0.69-1.29, and containing β-carotane and gammacerane, it is mature to high-mature light crude oil.(2) The natural gas composition of Baijiantan Formation in Penbei 1 well area of the study area is dominated by methane, with wet gas and dry gas coexisting. The ethane carbon isotope is relatively light, ranging from -31.34‰ to -27.83‰. Dimethylcyclopentane accounts for a large proportion of C7 light hydrocarbon compound, and oil-type gas and mixed gas are distributed.(3) The crude oil of Baijiantan Formation in Penbei 1 well area mainly originates from Permian Fengcheng Formation source rocks, with significant contributions from lower aquatic organisms in reducing environments. Natural gas mainly comes from Permian Fengcheng Formation source rocks, and part of it originates from Carboniferous source rocks.(4) Baijiantan Formation oil and gas reservoirs in Penbei 1 well area are lithologic or fault-lithologic oil and gas reservoirs with dual-source hydrocarbon-supply, multi-stage oil and gas charging, sedimentary facies belts controlling, and segmented by faults.

Key words: crude oil characteristics, natural gas characteristics, oil-gas source correlation, Baijiantan Formation, Triassic, Dabasong uplift, Junggar Basin

中图分类号: 

  • TE122
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