Oil-Source Correlation and Relative Contribution of Source Rock from Enping Formation in Zhu Ⅰ Depression
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摘要: 恩平组烃源岩成藏贡献研究对于拓展珠Ⅰ坳陷勘探新领域以及发现新的储量具有重要的应用价值, 目前相关研究较少.在油源对比的基础上, 将生标绝对含量与端元油配比实验相结合, 研究了珠Ⅰ坳陷恩平组烃源岩对单井油样的相对贡献.油源对比结果指示, 研究区原油可分为3类: 第1类源自始新统文昌组中深湖相烃源岩, 主要分布在惠陆低凸起、番禺4洼、流花凸起等地区; 第2类源自始新统-渐新统恩平组湖沼相烃源岩, 仅分布在惠州凹陷北部; 第3类为混源油, 发现于惠州凹陷南部和恩平凹陷.甾萜类绝对含量等7个指标建立的混源比例图版适用于计算油样中前两类烃源岩的相对贡献.计算结果表明, 文昌组烃源岩是珠Ⅰ坳陷的主力烃源岩, 恩平组烃源岩仅对惠州凹陷和恩平凹陷中的部分油样存在贡献.Abstract: Study of the contribution from Enping Formation to oil accumulation in Zhuyi depression has an important application value to the enlargement of exploration area and the discovery of new reserves, and the related research is less. In this paper, the correlation of oil and source rock in Zhu Ⅰ depression, Pearl River Mouth Basin is discussed first, and then the relative contribution of source rock in the Eocene to Oligocene Enping Formation (Ee) was investigated by combining end-member oil mixing experiment and biomarkers absolute concentrations. Oil-source correlation results show that the oils in Zhu Ⅰ depression can be divided into three classes. The first class derived from Eocene deep-water lacustrine Wenchang Formation (Ew) mainly distributes in Huilu low uplift, Panyu 4 sag and Liuhua uplift, etc. The second class derived from the Ee distributes only in the northern of Huizhou sag. The third class (mixed oils) derived from both the Ew and the Ee distributes in the southern of Huizhou sag and Enping sag. End-member oil mixing experiment shows that the plate established by concentration and geochemical indexes, such as steranes and terpanes concentration, was suitable to indicate the relative contribution of two types of source rock in Zhu Ⅰ depression. Results show that mudstones in the Ew was the main source rock in Zhu Ⅰ depression, the relative contribution of the Ee is only appear in the Huizhou sag and Enping sag.
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图 1 珠Ⅰ坳陷位置、构造单元及油岩样品取样井位
Fig. 1. Location, tectonic units and sampled wells of Zhu Ⅰ depression
图 2 珠Ⅰ坳陷文昌组与恩平组烃源岩热解数据对比
Fig. 2. Rock evaluation data of source rocks from the Ew and Ee in Zhu Ⅰ depression
图 3 珠Ⅰ坳陷原油生标绝对含量及组成特征对比
Fig. 3. Biomarker concentrations and composition features of oils in Zhu Ⅰ depression
图 4 珠Ⅰ坳陷原油与烃源岩对比
横坐标代表地球化学参数值；纵坐标代表不同的油岩样品
Fig. 4. Oil-source correlation of Zhu Ⅰ depression
图 5 珠Ⅰ坳陷端元油饱和烃组成(脱除正构烷烃)全二维气相色谱-飞行时间质谱对比
1.C27ααα20R-规则甾烷；2.C28ααα20R-规则甾烷；3.C29ααα20R-规则甾烷；4.C30-4-甲基甾烷；5, 6.双杜松烷；7.C30-藿烷；8.C14-倍半萜烷；9.五甲基十氢化萘；10.C15-倍半萜烷；11.8β(H)-补身烷；12.8α(H)-补身烷；13.C16-倍半萜烷；14.8α(H)-升补身烷；15~18.C19~C22-三环萜烷；19~22.C23~C26-三环萜烷；23.C24-四环萜烷
Fig. 5. Composition comparison of saturated hydrocarbons (without normal-alkanes) of two end-member oils in Zhu Ⅰ depression using GC×GC-TOFMS total ion chromatogram
表 1 珠Ⅰ坳陷文昌组与恩平组烃源岩地球化学参数对比
Table 1. Geochemical parameters comparison of source rock from the Ew and Ee in Zhu Ⅰ depression
烃源岩 凹陷 TOC Pr/Ph TeT/C30H C27S/C29S C19~C22TT/ C23~C26TT Bi/C30H C30S/C29S 恩平组 陆丰凹陷 1.75 4.40 0.08 0.74 1.76 0.06 0.22 惠州凹陷 5.12 3.15 0.16 0.55 3.32 0.91 0.15 西江凹陷 2.32 2.45 0.08 0.53 1.82 0.72 0.14 恩平凹陷 3.23 2.72 0.11 0.64 2.37 2.66 0.15 平均值 3.68 3.27 0.12 0.60 2.55 0.97 0.16 文昌组 陆丰凹陷 2.42 3.43 0.05 0.75 0.94 0.05 0.34 西江凹陷 4.56 2.17 0.05 0.76 1.73 0.22 0.15 恩平凹陷 1.30 1.10 0.14 1.00 1.22 0.57 0.19 平均值 2.80 2.63 0.06 0.80 1.22 0.20 0.26 注：TeT.四环萜烷；H.藿烷；S.规则甾烷；TT.三环萜烷；Bi.双杜松烷；C30S.C30-4-甲基甾烷. 
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表 2 珠Ⅰ坳陷3类原油不同生标绝对含量平均值对比(10-3)
Table 2. Main biomarker concentrations of the three oil classes in Zhu Ⅰ depression
项目 正构烷烃 倍半萜烷 五环三萜 甾烷 三环萜烷 C30-4-甲基甾烷 双杜松烷 第1类原油 331.18 2.85 8.39 1.17 0.69 0.29 0.030 第2类原油 479.06 1.62 0.81 0.09 0.18 痕量 0.013 第3类原油 499.02 2.68 2.23 0.46 0.29 0.14 0.050
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表 3 珠Ⅰ坳陷3类原油地球化学参数对比
Table 3. Geochemical parameters comparison of the three oil classes in Zhu Ⅰ Depression
原油种类 构造位置 Pr/Ph C19~C22/ C23~C26TT C19TT/ C23TT TT/PT C30DH/C30H C30S/C29S Bi/C30H 第1类 惠州凹陷南缘 2.68 0.51 0.35 0.18 0.10 1.43 0.22 惠陆低凸起 2.23 0.58 0.48 0.14 0.15 0.75 0.15 番禺低隆起 1.56 0.53 0.32 0.19 0.10 1.05 0.05 平均值 2.12 0.55 0.40 0.17 0.12 0.98 0.13 第3类 恩平凹陷 2.53 0.84 1.19 0.31 0.11 1.65 1.54 惠州凹陷南缘 2.44 0.81 0.75 0.39 0.22 0.98 1.47 平均值 2.47 0.81 0.87 0.37 0.19 1.16 1.49 第2类 惠州凹陷北部 4.83 10.79 21.76 0.30 0.15 0.08 0.71 注：TT.三环萜烷；PT.五环萜烷；DH.重排藿烷；H.藿烷；C30S.C30-4-甲基甾烷；S.规则甾烷；Bi.双杜松烷.
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