地学前缘 ›› 2010, Vol. 17 ›› Issue (1): 361-372.

• 论文 • 上一篇    下一篇

塔里木盆地轮南地区碳酸盐岩油气藏原油酸值的分布特征及其形成机制

  

  1. 1大庆石油学院, 黑龙江 大庆 163318
    2中国石油勘探开发研究院, 北京 100083
    3中国石油塔里木油田勘探开发研究院, 新疆 库尔勒 841000
    4西南石油大学, 四川 成都 610500
  • 出版日期:2010-01-28 发布日期:2010-01-28

 Distribution characteristics of acid value of crude oil in carbonate reservoirs in Lunnan area, Tarim Basin and their formation mechanism.

  1. 1Daqing Petroleum Institute, Daqing 163318, China
    2Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    3Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, CNPC, Korla  841000, China
    4Southwest Petroleum University, Chengdu 610500, China
  • Online:2010-01-28 Published:2010-01-28

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摘要：

轮南地区是塔里木盆地北部的主要含油气区,该地区奥陶系原油中酸值含量普遍较低,分布范围在001~141 mg KOH/g,大多数原油属于低含酸原油,少数属于含酸原油或高酸原油,酸值在平面上表现出明显的“西高东低”特征。通过原油物性对比、地球化学分析及成藏过程的研究发现,原油的酸值与其母质类型、成熟度、生物降解程度及油气充注史均有一定的关系,尤其与生物降解作用密切相关。通过对原油生物标志化合物的分析,判定该区含酸原油为混合成因,这与油气成藏过程分析结果是一致的。原油中酸性物质含量会影响原油的性质,原油的酸值与物理性质具有明显的相关关系,轮南地区油气性质差异明显,具有“西油东气”的分布格局,原油的密度、胶质沥青质含量、含硫量等也具有“西高东低”的分布特点,而气油比、含蜡量等则表现为相反的分布特征。

关键词: 含酸原油, 酸值, 碳酸盐岩, 奥陶系, 轮南, 塔里木盆地

Abstract:

Lunnan area was an important petroliferous province in the northern Tarim Basin. The acid value of the crude oil in the Ordovician carbonate reservoirs was generally low, 001141 mg KOH/g on the whole, and most of them were low, some were acidic oil or high acidvalue oil. In horizontal, acid value was high in the west and low in the east. According to the study of oil physical properties, geochemical characteristics and accumulation processes, acid value of crude oil was related to kerogen type, maturity and hydrocarbon charging processes, especially biodegradation. Based on biomarkers analysis, the acidiferous oil was of mixing origin in this area, which was consistent with analytical results of hydrocarbon accumulation. The acidic substances content of crude oil would affect oil nature, so the acid value of crude oil was obviously accorded with physical properties. In the Lunnan area, the properties of oil and gas are significantly different, with distribution pattern of “oil in the west and gas in the east”. The density, gumasphaltene content and sulfur content of crude oil also had the distribution of “high in the west and low in the east”, while the gasoil ratio and wax content had the opposite characteristics.

Key words:  acidic oil, acidic value, carbonate rock, Ordovician, Lunnan area, Tarim Basin

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