Research on Characteristic of Source Rock and Immature Oils Distribution in Western Depression, Liaohe Basin
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摘要: 未-低成熟油的发现及其成因研究是近年来油气地球化学的重要进展之一, 从源岩的基本特征入手, 分析辽河盆地低熟油的生成能力, 将原油划分为六类: 未熟-低熟降解稠油、未熟未降解稠油、低熟降解稠油、低熟未降解稀油、正常稀油和成熟降解稠油.研究表明, 未-低熟油的分布受深度、生油洼陷的构造带及断层输导能力的控制.Abstract: The discovery and study of immature oils is one of the most important progresses in oil and gas geochemistry in recent years. The generation hydrocarbons have been studied based on source rock characters. The oil is divided into six types, namely immature to lower mature, bio degraded heavy oil, immature undegraded heavy oil, lower mature bio degraded heavy oil, lower mature oil, normal oil and mature bio degraded heavy oil. On the basis of above, it was researched about immature oils distribution character. It shows that the immature oils distribution is controlled by depth, structural belt of oil generating depression and fault conducting ability.
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Key words:
- Liaohe basin /
- immature oil /
- generation hydrocarbon potential /
- genetic type /
- distribution character
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图 1 辽河盆地各层位源岩有机质丰度对比
w (A) 和w (HC) 的数值在图上均缩小1 000倍
Fig. 1. Correlation of organic matter abundance in source rocks of different ages in Liaohe basin
图 2 辽河盆地不同地层单元样品的氢指数与热解峰温关系
Fig. 2. Hydrogen index (HI) and tmax diagram of rock-eval results in different stratigraphic units from Liaohe basin
图 3 辽河盆地红外光谱参数与N (H) /N (C) 原子比的关系
Fig. 3. Relationship between factors of infrared spectroscopic and N (H) /N (C) (atomic ratio) in Liaohe basin
图 4 辽河盆地西部凹陷原油w (Ts) /w (Tm) 随深度的变化, 箭头示未降解原油的成熟系列
Fig. 4. Variations of crude oil w (Ts) /w (Tm) with depth in Liaohe basin, western depression; Arrow represents maturity of undegradation crude oil
图 5 冷东地区冷97井-39井油藏剖面及原油物理化学性质和地层水化学组成的变化
原油和地层水中组分值均为质量分数
Fig. 5. Oil deposit profile from well Leng97-39 in Lengdong and variation of physical-chemical character of crude oil and chemical composition in strata water
表 1 辽河盆地西部凹陷主要干酪根成因类型
Table 1. Genetic types of kerogen in western depression, Liaohe basin
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