安达向斜达9井扶余油层油流的确定

Determination of the oil stream of Fuyu oil reservoir in Da No.9 well in Anda Syncline

分析源岩的机质丰度证实,安达向斜青山口组一段(K_2qn_1)暗色泥岩达到生油指标。通过原油物性、色谱参数及生物标志化合物特征对达9井扶余油层原油与安达向斜青山口组一段烃源岩、三肇凹陷扶余油层原油进行了对比。C_(29)20S/(20S+20R)等参数表明达9井扶余油层原油的成熟度低于三肇凹陷扶余油层的原油成熟度;伽马蜡烷等指数证实达9井扶余油层原油的形成环境与三肇凹陷扶余油层原油的形成环境不同;三环萜烷/藿烷母源参数证实达9井扶余油层原油与安达向斜青山口组一段烃源岩具有亲缘性。因此,达9井扶余油层的原油主要来自安达向斜青山口组一段烃源岩的自生油。

Through the analysis of the organic matter abundance of the source rock, the dark mudstone of Qingshakou No. 1 Member （ K2qnI ） in Anda Syncline is proven to reach oil-generating index. By means of comparison of crude oil physical properties, chromatogram parameters and biomarker features of Da No. 9 well＇ s Fuyu oil reservoir with the above source rock and the crude oil in Fuyu reservoir of Sanzhao Sag, the parameters such as C29 20S/ （205 ＋ 20R） and so on prove that the maturity of the crude oil in Fuyu reservoir in Da No. 9 well is lower than one of Sanzhao; and the in- dexes such as gamma paraffin hydrocarbon show that the generation environments of the crude oil of Da No. 9 well is different from that of Sangzhao; the parent-source parameters for example tricycle terpane/hopane indicate that the crude oil of Da No. 9 well has close relation with that of source rock of K2qn1. Therefore the crude oil in Fuyu reservoir of Da No. 9 well is mainly self-generated oil from the source rock of K2qn1.