王古1井奥陶系油气成因及其意义

李素梅; 庞雄奇; 邱桂强; 高永进

王古1井奥陶系油气成因及其意义

李素梅^{1, 2,},
庞雄奇^{1, 2},
邱桂强³,
高永进³

1.
中国石油大学油气成藏机理教育部重点实验室, 北京 102249
2.
中国石油大学盆地与油藏研究中心, 北京 102249
3.
中国石化胜利石油有限公司, 山东东营 257015

基金项目:

国家重点基础研究发展规划项目 G199943310

详细信息

作者简介:
李素梅(1968-), 女, 副教授, 主要从事有机地球化学、油气成藏地球化学研究. E-mail: smli8888@yahoo.com.cn

中图分类号: P618.13
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出版历程
- 收稿日期: 2004-12-25
- 刊出日期: 2005-07-25

Origin and Significance of the Ordovician Oil from Well WG 1, Dongying Depression, Bohai Bay Basin

1.
Key Laboratory for Hydrocarbon Accumulation Mechanism, China University of Petroleum, Beijing 102249, China
2.
Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China
3.
Shengli Oilfield Company Limited, SINOPEC, Dongying 257015, China

摘要

摘要: 首次在东营凹陷南斜坡王古1井奥陶系古潜山中获得深层高蜡油(含蜡量40.84%), 其富含蜡质烃, 甾、萜类等高分子量化合物含量甚微.采用分子筛络合技术对王古1井原油中的甾、萜类化合物进行了浓缩, 并对碳酸盐岩储层中的方解石脉包裹体进行了化学成分分析.结果表明, 王古1井奥陶系原油及储层包裹烃的组成与分布具有深层孔店组烃源岩的特征, 与沙四段烃源岩相关性差, 揭示奥陶系原油不同于以往发现的第三系沙河街组原油.正构烷烃单体同位素δ¹³C值分析也表明, 王古1井原油与孔店组烃源岩接近且变化趋势大体一致, 反映孔店组为其可能的油源岩.王古1井奥陶系油气的发现表明东营凹陷存在一套迄今尚未发现的深层油源岩, 该区具有深层油气勘探潜力.
- 奥陶系 /
- 古潜山 /
- 高蜡油 /
- 源岩 /
- 孔店组
Abstract: Considerable quantities of Ordovician oils were recently discovered from the burial hill in well WG 1 in the south slope of the Dongying depression, Bohai Bay basin. The oils are characterized by high content of waxy alkanes (40.84%) with a low concentration of steranes and terpanes, which are completely different from the overlying Tertiary oils of the Shahejie Formation. By removing the alkanes from the Ordovician oil with a molecular sieve and analyzing the inclusion component of well WG 1, important biomarker information was obtained, such as steranes and terpanes, which are crucial for source rock tracing.Resultsshow that the Ordovician oil and inclusion component of the well WG 1 correlated well with the source rocks of the Tertiary Kongdian Formation (Ek²) rather than that of the Shahejie Formation, suggesting potential source rocks for the Ordovician oils.Resultsof the δ¹³C values of the compound-specific isotope of alkanes show similar values and varying trend of the Ordovician oils to that of the Ek² source rocks, which further proves the Ek² mudstones to be responsible for the deep oils. The discovery of the high waxy oils of Ordovician from well WG 1 suggests the existence of a new set of deep source rocks and good potential of deep oils in the Dongying depression.
- Ordovician /
- burial hill /
- high waxy oil /
- source rock /
- Kongdian Formation

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图 1 样品与油气分布

Fig. 1. Oil distribution and location of the samples collected

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图 2 王古1井原油TIC、m/z217、m/z191质量色谱

Fig. 2. TIC, m/z217 and m/z191 mass fragmatograms of the saturate fractions of the oils from WG 1 well

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图 3 王古1井原油(经络合后) m/z217、m/z191质量色谱

Fig. 3. m/z217 and m/z191 mass chromatogrms for the oil of the WG 1 well after removal of alkans by molecular sieve

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图 4 王古1井奥陶系原油、储层包裹烃与沙河街组原油对比特征

Fig. 4. Correlation of the Ordovician oils and inclusion component of the WG 1 well with the oils of Shahejie Formation

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图 5 王古1井储层包裹体成分饱和烃TIC、m/z217、m/z191质量色谱

Fig. 5. TIC, m/z217 and m/z191 mass fragmatograms of the inclusion component from the WG 1 well

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图 6 牛庄洼陷及其斜坡带沙四段、孔店组烃源岩m/z191、m/z217质量色谱

Fig. 6. m/z191 and m/z217 mass chromatograms of the Es⁴ and Ek rock extracts of the samples from the Niuzhuang sag and its south slope

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图 7 原油、烃源岩可溶物正构烷烃同位素分布

Fig. 7. Distribution of compound specific isotope of the alkanes from the oils and rock extracs

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表 1 原油、烃源岩可溶物饱和烃气相色谱参数表

Table 1. Basic parameters of gas chromatogram for the oils and rock extracts

表 2 原油、烃源岩基本地球化学参数

Table 2. Basic geochemical parameters for the oils and rock extracts

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