下刚果盆地Haute Mer A区块X-1井原油油源研究

doi:10.3969/j.issn.1672-7703.2017.04.010

摘要/Abstract

摘要： 对下刚果盆地Haute Mer A区块X-1井3个原油样品及X-1井、M-1井上白垩统、古近系共14个岩屑样品进行详细的分析研究，其结果表明X-1井原油生物标志化合物组合特征与南大西洋典型湖相烃源岩具有明显区别。X-1井原油（1982.1~1989.2m）Pr/Ph比值低（0.97），Pr/nC₁₇和Ph/nC₁₈分别为0.85和0.96，C₂₆/C₂₅三环萜烷小于1.0，C₃₀四环聚异戊二烯烷烃/C₂₇重排甾烷比值低（0.55），具有海相烃源岩特征。原油中奥利烷丰度高，指示其来自上白垩统或以上的烃源岩。油源对比表明X-1井原油与上白垩统—始新统Madingo组烃源岩具有成因上的联系。盆地模拟研究进一步证明中新统Paloukou组烃源岩局部成熟，供烃能力有限；而Madingo组烃源岩目前正处于生、排烃高峰期，沉积中心则处于高—过成熟阶段，X-1井紧临Madingo组生烃洼陷，有利于油气聚集成藏。因此，推断Madingo组烃源岩为X-1井原油的主要贡献者。

关键词: 下刚果盆地, Haute Mer A区块, 湖相烃源岩, 海相烃源岩, 奥利烷指数, 油源对比

Abstract: In this paper, detailed analysis was made on 3 oil samples from Well X-1 and 14 cutting samples from Wells X-1 and M-1 in the Haute Mer A Block, the Lower Congo Basin. The results show that the composite biomarker characteristics of oil produced from Well X-1 are obviously different from that of typical lacustrine source rocks in the South Atlantic. The crude oil (1982.1-1989.2 m) of Well X-1 presents the characteristics of marine source rocks with low Pr/Ph (0.97), Pr/nC₁₇ of 0.85, Ph/nC₁₈ of 0.96, C₂₆/C₂₅ tricyclic terpane less than 1.0 and low C₃₀ tetracyclic polyisoprene paraffin hydrocarbon/C₂₇ diasteranes (0.55). Its oleanane abundance is high, indicating that the oil was originated from the source rocks of Upper Cretaceous or above. Oil-source correlation indicates that the oil is genetically related to the source rocks of Upper Cretaceous-Eocene Madingo Formation. The basin modeling further proves that the Miocene Paloukou Formation source rocks are locally matured with limited hydrocarbon supplying capacity, while the Madingo Formation source rocks are currently during the peak stage of hydrocarbon generation and expulsion. The depocenter is during high-over mature stage. Well X-1 is close to the hydrocarbon generating sag of Madingo Formation, where conditions are favorable for oil and gas accumulation. Therefore, it is inferred that the source rocks of Madingo Formation serve as the major contributor to the oil of Well X-1.

Key words: Lower Congo Basin, Haute Mer A Block, lacustrine source rock, marine source rock, oleanane index, oil source correlation

中图分类号:

TE125.5

林青, 郝建荣, 王建新. 下刚果盆地Haute Mer A区块X-1井原油油源研究[J]. 中国石油勘探, 2017, 22(4): 98-107.

Lin Qing, Hao Jianrong, Wang Jianxin. Study on oil source of Well X-1 in Haute Mer A Block,Lower Congo Basin[J]. China Petroleum Exploration, 2017, 22(4): 98-107.

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