珠江口盆地惠西南地区凝析油轻烃地球化学特征

杨兴业; 朱俊章; 朱明; 龙祖烈; 熊万林; 郑仰帝; 陈聪

doi:10.19509/j.cnki.dzkq.2022.0116

珠江口盆地惠西南地区凝析油轻烃地球化学特征

doi: 10.19509/j.cnki.dzkq.2022.0116

中海石油(中国)有限公司深圳分公司, 广东深圳 518054

基金项目:

"十三五"国家科技重大专项"南海东部海域勘探新领域及关键技术" 2016ZX05024-004

详细信息

作者简介:
杨兴业(1987-), 男, 工程师, 主要从事油气地球化学研究工作。E-mail: yangxy34@cnooc.com.cn

中图分类号: P618.13
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- 文章访问数: 431
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- 被引次数: 0
出版历程
- 收稿日期: 2021-01-08
- 网络出版日期: 2022-09-07

Geochemical characteristics of light hydrocarbons in condensate oil from the southwestern Huizhou of the Pearl River Mouth Basin

Shenzhen Branch of CNOOC Ltd., Shenzhen Guangdong 518054, China

摘要

摘要:
惠西南地区是珠江口盆地珠一坳陷重要的原油富集区, 但近年来在新近系珠江组上段和古近系恩平组、文昌组以及基岩潜山储层中陆续发现了凝析油气。利用全油气相色谱和饱和烃色谱-质谱分析技术对凝析油样开展了轻烃和生物标志化合物地球化学特征分析, 探讨了惠西南地区凝析油的成因。研究表明: 轻烃组分特征、C₇异构烷烃、环烷烃及正构烷烃和生物标志化合物特征均指示H6-1构造凝析油来源于半深湖-深湖相文昌组烃源岩, 为腐泥型烃源岩在相对高成熟阶段(R_o处于1.2%~1.3%)生成的凝析油; H1-1构造凝析油来源于浅湖沼泽相恩平组烃源岩, 为偏腐殖型烃源岩在相对低成熟阶段(R_o处于0.9%~1.1%)生成的富低碳数烷烃油气; 揭示了惠西南凝析油的形成受到烃源母质类型和热演化阶段的双重控制。研究结果为富油生烃凹陷凝析油气勘探潜力评价分析提供了地球化学依据和支撑。
- 凝析油 /
- 轻烃 /
- 生物标志化合物 /
- 珠江口盆地
Abstract:
The southwestern Huizhou is an important crude oil enrichment area in the Zhu Ⅰ Depression of the Pearl River Mouth Basin. However, condensate oil and gas have been discovered in the upper memberof Neogene Zhujiang Formation, Paleogene Enping and Wenchang formations, and basement buried hill reservoirs in recent years. In this study, the origin of condensate oil was revealed based on the integration of light hydrocarbons and biomarkers characteristics, which were obtained from GC of whole-oil and GC-MS of saturated fractions.The results, including light hydrocarbon composition, C₇ is o-alkanes, naphthene, n-alkanes and other biomarkers indicate that the condensate oil in the H6-1 structure came from the semi-deep to deep lacustrine source rock in Wenchang Formation, which was generated by sapropelic kerogen with relatively high maturity (1.2%-1.3% R_o). In contrast, the condensate oil in the H1-1 structure originated from the shallow lake to peat facies source rock in Enping Formation, the oil was rich in alkanes with low-carbon number which was generated by humic kerogen with relatively low maturity (0.9%-1.1% R_o).The results suggest that the formation of condensate oil in the southwestern Huizhou is both controlled by organic matter type and thermal evolution stage of source rock. This study provides a geochemical basis and support for the evaluation and analysis of condensate oil and gas exploration potential in hydrocarbon-rich depressions.
- condensate oil /
- light hydrocarbons /
- biomarkers /
- Pearl River Mouth Basin

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图 1 珠江口盆地及研究区构造单元(a, b)及地层划分(c)

Figure 1. Tectonic units (a, b), and stratigraphic division (c) of the study area in Pearl River Mouth Basin

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图 2 惠西南地区凝析油中的轻烃地球化学特征

Figure 2. Geochemical characteristics of light hydrocarbons in condensate oil in the southwestern Huizhou

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图 3 惠西南地区凝析油C₇轻烃系统三角图版

Figure 3. Triangle diagram of the C₇ light hydrocarbon of condensate oil in the southwestern Huizhou

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图 4 C₇轻烃稳态催化动力学演化模式示意图^[12]

P₁.正庚烷；P₂.2-甲基已烷+3-甲基已烷；N₂.1, 1-二甲基环戊烷+1, 3-二甲基环戊烷(顺、反)；P₃.3-乙基戊烷+3, 3-二甲基戊烷+2, 3-二甲基戊烷+2, 4-二甲基戊烷+2, 2-二甲基戊烷+2, 2, 3-三甲基丁烷；N₁⁵.乙基环戊烷+1, 2-二甲基环戊烷(顺、反)；N₁⁶.甲苯+甲基环已烷

Figure 4. Schematic diagram of steady-state catalytic kinetics evolution mode for C₇ light hydrocarbons

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图 5 惠西南地区凝析油轻烃N₁⁶/N₁⁵-(N₁⁶+N₁⁵)/(P₂+P₃+N₂)分布图

P₂.2-甲基已烷+3-甲基已烷；N₂.1, 1-二甲基环戊烷+1, 3-二甲基环戊烷(顺、反)；P₃.3-乙基戊烷+3, 3-二甲基戊烷+2, 3-二甲基戊烷+2, 4-二甲基戊烷+2, 2-二甲基戊烷+2, 2, 3-三甲基丁烷；N₁⁵.乙基环戊烷+1, 2-二甲基环戊烷(顺、反)；N₁⁶.甲苯+甲基环已烷

Figure 5. Distribution of light hydrocarbons N₁⁶/N₁⁵-(N₁⁶+N₁⁵)/(P₂+P₃+N₂) of condensate oil in the southwestern Huizhou

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图 6 惠西南地区凝析油凝析油轻烃C₇星状图

Para1.2, 2-二甲基戊烷/P₃；Para2.2, 3-二甲基戊烷/P₃；Para3.2, 4-二甲基戊烷/P₃；Para4.3, 3-二甲基戊烷/P₃；Para5.3-乙基戊烷/P₃；P₃.2, 2-二甲基戊烷+2, 3-二甲基戊烷+2, 4-二甲基戊烷+3, 3-二甲基戊烷+3-乙基戊烷

Figure 6. Star chart of C₇ light hydrocarbons of condensate oil in the southwestern Huizhou

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图 7 惠西南地区凝析油正庚烷指数-异庚烷指数分布特征

Figure 7. N-heptaneand iso-heptane index distribution of condensate oil in the southwestern Huizhou

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图 8 惠西南地区凝析油iC₄/nC₄-iC₅/nC₅分布图

Figure 8. iC₄/nC₄-iC₅/nC₅ distribution of condensate oil in the southwestern Huizhou

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图 9 惠西南地区典型凝析油全油色谱图

Figure 9. Typical gas chromatogram of condensate oil in the southwestern Huizhou

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图 10 惠西南地区凝析油及惠州凹陷典型烃源岩生物标志化合物特征

Figure 10. Biomarker characteristics of condensate oil in the southwestern Huizhou and typical source rocks in the Huizhou Depression

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图 11 惠西南地区凝析油成藏模式图(剖面位置见图 1)

Figure 11. Accumulation model of condensate oil in the southwestern Huizhou

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表 1 惠西南地区凝析油物性特征

Table 1. Physical properties of condensate oil in the southwestern Huizhou

凝析油藏	密度20℃/(t·m^-3)	黏度50℃/(mPa·s)	含蜡量/%	凝固点/℃
H6-1	0.767	0.815	5.7	11
H1-1	0.740	0.023	—	6
注：—低于检测下限

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表 2 用于轻烃C₇星状图的化合物沸点和水溶解度^[15]

Table 2. Parameters for the star chart of C₇ light hydrocarbons

化合物名称	沸点/℃	水溶解度/10^-6
2, 2-二甲基戊烷	79.2	4.4
2, 3-二甲基戊烷	89.8	5.3
2, 4-二甲基戊烷	80.5	4.4
3, 3-二甲基戊烷	86.1	5.9
3-乙基戊烷/	93.5	3.0
P₃	85.0	5.0

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