南堡凹陷混源油分布与主力烃源岩识别

李素梅; 庞雄奇; 万中华

doi:10.3799/dqkx.2011.112

南堡凹陷混源油分布与主力烃源岩识别

doi: 10.3799/dqkx.2011.112

李素梅^{1, 2,},
庞雄奇^{1, 2},
万中华^{1, 2}

1.
中国石油大学油气资源与探测国家重点实验室, 北京昌平 102249
2.
中国石油大学地球科学院盆地与油藏研究中心, 北京昌平 102249

基金项目:

国家自然基金 40973031

中国石油大学资源与探测国家重点实验室基金 PRPJC2008-02

详细信息

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

中图分类号: P618
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- 文章访问数: 149
- HTML全文浏览量: 118
- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2011-04-29
- 网络出版日期: 2021-11-10
- 刊出日期: 2011-06-15

Mixed Oil Distribution and Source Rock Discrimination of the Napu Depression, Bohaibay Basin

LI Su-mei^{1, 2
,},
PANG Xiong-qi^{1, 2},
WAN Zhong-hua^{1, 2}

1.
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
2.
Research Center of Basin and Reservoir, College of Geosciences, China University of Petroleum, Beijing 102249, China

摘要

摘要: 南堡凹陷油气源尚不清晰.首次采用单体烃碳同位素、结合生物标志物对全凹陷范围的原油和烃源岩进行了精细地球化学研究.分析表明, 拾场次洼沙三段烃源岩(Ⅰ类)发育高丰度的4-甲基甾烷与硫芴系列、贫伽玛蜡烷, 单体烃碳同位素为"斜直线型", 相关原油分布于高柳深层; 南堡凹陷南部沙二+三段源岩(Ⅱ类)伽玛蜡烷较发育, 但4-甲基甾烷不太发育, 其他特征类似于Ⅰ类源岩, 相关原油发现于潜山; 南堡凹陷沙一段-东三段烃源岩(Ⅲ类)富含重排甾烷与孕甾烷系列, 单体烃碳同位素较轻且近"W"型, 相关原油主要分布于南堡4、5号构造带.发现南堡油田1、2号构造带、老爷庙、高柳中浅层原油具有界于Ⅱ、Ⅲ类源岩(及相关原油)间的同位素与生标特征, 系混源油, 定量预测出混源油中沙二+三段源岩的贡献最高达82%.本研究关于Es₂₊₃系南堡凹陷重要的油气源的认识不同于以往研究, 为该区进一步油气勘探提供了重要依据.
- 南堡凹陷 /
- 混源油 /
- 生物标志物 /
- 单体烃碳同位素 /
- 石油地质
Abstract: The origin of the hydrocarbons in the Napu depression is still not clear. Compound specific carbon isotope of n-alkanes has been utilized, combined with biomarkers to carry out detail geochemical investigations for the oils and source rocks within the whole depression for the first time. The results show that the Tertiary Es₃ rocks (type-Ⅰ) in the Shichang sub-depression are characterized by abundant 4-methyl steranes and dibenzothiophenes but low concentration of gammacerane with a "tilted linear" shape of compound specific carbon isotope distribution. The type-Ⅰ genetic related oil has been discovered in the Tertiary Es₃ interval of Gaoshangpu and Liuzan oilfields. The Tertiary Es₂₊₃ rock (type-Ⅱ) in the south Nanpu depression is featured by a relatively high content of gammacerane while little 4-methyl sterane contained, and it has a similar carbon isotope curve and dibenzothiophene concentration to that of the type-Ⅰ rock. The type-Ⅱ genetic oil has been discovered in the Ordovician burial hills. The Tertiary Es₁-Ed₃ rock (Ⅲ) in the Nanpu depression is distinguished from the others by obviously high content of diasteranes and pregnant series with a relatively lowerδ¹³C of n-alkane and nearly a "W" shape of carbon isotopic pattern. The type-Ⅲ genetic related oils was discovered in the NP4, 5 tectonic belts. It is observed that the oils in the NP1, 2 tectonic belts, Laoyemiao oilfield and the Tertiary Nm-Es₁ of Gaoshangpu and Liuzan oilfield have intermediate biomarker and isotope characteristics between the type-Ⅱ and type-Ⅲ source rocks and the related oils, indicating mixed sources of the oils derived from both the type-Ⅱ and type-Ⅲ rocks. It is found that the related contribution of the Es₂₊₃ source rocks to the mixed oils is up to 82%. We suggest that the Es₂₊₃ is an important set of source rock in the Nanpu depression, responsible for most of the oils. This result is different from the previous ones that most of the oils in the Nanpu depression were derived from the Es₁-Ed₃ source rocks rather than the Es₂₊₃, which provides essential information for further petroleum exploration of the depression.
- Napu depression /
- mixed oil /
- biomarkers /
- compound specific isotope /
- petroleum geology

HTML全文

图 1 南堡凹陷主要构造单元、油气田及样品分布

1.油样；2.海岸线；3.二级构造线；4.油藏；5.断层线

Fig. 1. Tectonic units of the Nanpu Depression and location of oil fields and oil samples collected

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图 2 南堡凹陷不同类型原油m/z 217质量色谱

Fig. 2. The m/z 217 mass fragmentogram of saturate fractions from the representative oils in the Nanpu depression

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图 3 南堡凹陷原油族群划分

Fig. 3. Classification of oil-families for the oils in the Nanpu depression

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图 4 南堡凹陷不同类型原油单体烃碳同位素曲线分布型式

Fig. 4. Distribution pattern of compound specific carbon isotope of n-alkanes for the oils in the Nanpu depression

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图 5 南堡油田原油聚类分析谱系

Fig. 5. Cluster analysis of the oils in the Nanpu oilfield

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图 6 南堡油田油-岩多参数对比

Fig. 6. Oil-source correlation based on biomarker parameters

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图 7 南堡凹陷原油、烃源岩芴、氧芴、硫芴聚类相关图

Fig. 7. Ternary plot showing the relative distribution of fluorene, dibenzofuran and dibenzothiophene in the oils and source rock extracts from the Nanpu depression indicating oil source

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图 8 南堡凹陷烃源岩单体烃碳同位素曲线

Fig. 8. Distribution pattern of compound specific carbon isotope of n-alkanes for the source rocks in the Nanpu depression

下载: 全尺寸图片幻灯片

表 1 南堡凹陷部分混源油中Es₂₊₃成因原油相对贡献

Table 1. Percentage of the Es₂₊₃ genetic oils in the mixed oils

油田	井号	井深(m)	层位	贡献量(%)
高尚堡	GC63	2156.4~2224.0	Ng	63
高尚堡	G29-8	2202.8~2206.0	Ng	54
高尚堡	G93	2435.5~2444.0	Ed₁	55
高尚堡	G66-28	2625.0~2634.0	Ed₁	25
高尚堡	G59-10	2656.0~2705.2	Ed₁	42
高尚堡	G17-18	2313.0~2419.2	Ed₃	36
高尚堡	G97X5	2816.0~2856.0	Ed₃	46
高尚堡	G139X1	3296.6~3303.2	Ed₃	52
高尚堡	G76-26	2760.0~3001.6	Es₁	82
老爷庙	M23-9	1972.0~1975.0	NgⅠ	33
老爷庙	M26-25	2503.4~2544.0	Ed₁	75
南堡油田	NP1-3	3084.4~3154.4	NgⅣ	31
南堡油田	NPX1-5	2797.4~2895.0	Ed₁	48
南堡油田	NP12-P801	3084.0~3272.0	Ed₁	39
南堡油田	NP13-P1656	3435.0~3620.0	Ed₁	29
南堡油田	NP1	2379.8~2410.0	Ed₁	51
南堡油田	NP1-29	2355.4	Ed₃	40
南堡油田	NP2-3	2649.4~2480.4	Ed₁	71
南堡油田	NP23-P2201	2924.4~3020.0	NgⅡ	54
南堡油田	NP2-82	4880.0~4955.0	O	75

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