塔里木盆地玉北1井原油成因再认识及其意义

孙永革; 路清华; 何毓新; 孔丽姝; 刘少杰; 顾忆

doi:10.11781/sysydz202105810

塔里木盆地玉北1井原油成因再认识及其意义

doi: 10.11781/sysydz202105810

孙永革^{1, 2, 3,},
路清华^{1, 2},
何毓新³,
孔丽姝³,
刘少杰⁴,
顾忆^{1, 2}

1.
中国石化油气成藏重点实验室, 江苏无锡 214126
2.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126
3.
浙江大学地球科学学院有机地球化学研究组, 杭州 310027
4.
中国石化西北油田分公司勘探开发研究院, 乌鲁木齐 830011

基金项目:

国家自然科学基金 42030803

详细信息

作者简介:
孙永革(1969-), 男, 博士, 教授, 从事有机地球化学研究。E-mail: ygsun@zju.edu.cn

中图分类号: TE122.1
计量
- 文章访问数: 434
- HTML全文浏览量: 124
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-06
- 修回日期: 2021-08-24
- 刊出日期: 2021-09-28

Recognition of origin of crude oil from well Yubei 1 in Tarim Basin and its significance

SUN Yongge^{1, 2, 3
,},
LU Qinghua^{1, 2},
HE Yuxin³,
KONG Lishu³,
LIU Shaojie⁴,
GU Yi^{1, 2}

1.
SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China
2.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China
3.
Organic Geochemistry Unit, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, China
4.
Petroleum Exploration & Production Research Institute, SINOPEC Northwest Oilfield Company, Urumqi, Xinjiang 830011, China

摘要

摘要: 塔里木盆地下古生界含油气系统的油源问题至今仍存在争议。在详细剖析塔里木盆地玉北地区玉北1井原油的分子同位素地球化学特征的基础上，以反演的思路解决该区下古生界含油气系统的油源问题。玉北1井原油作为两期成藏叠加的产物，其两期成藏的油源均为同一套寒武系烃源岩生油高峰期的产物，系不同区域烃源层的埋深差异导致成烃时序的不同。早期成藏的原油由于地层抬升剥蚀遭受严重生物降解，而晚期成藏得以良好保存。尽管原油生物标志化合物组成和分子碳同位素分布特征与盆地内下古生界含油气系统原油具有可对比性，但玉北1井原油中芳基类异戊二烯烃分布指示塔西南下寒武统烃源岩发育的沉积环境与台盆区可能存在一定差异，有待于进一步深入研究。
- 原油成因 /
- 地球化学特征 /
- 成藏特征 /
- 油源对比 /
- 玉北地区 /
- 塔里木盆地
Abstract: The oil source of the Lower Paleozoic petroliferous system in the Tarim Basin is still controversial. Based on the detailed analysis of the molecular isotopic geochemistry of the crude oil from well Yubei 1 in the Yubei area of the Tarim Basin, the oil source of the Lower Paleozoic petroliferous system in this area was studied by inversion ideas. The crude oil from well Yubei 1 was the superimposed product of two phases of accumulation, and the oil sources of the two phases were the products of the same set of Cambrian source rocks during the peak period of oil generation. The burial depth of Cambrian source strata in different areas could be the main factor leading to multiple phases of hydrocarbon charging. Crude oil accumulated in the early stage experienced severe biodegradation due to strata uplift and erosion, while oil in the late stage was well preserved. Although the biomarker assemblages and molecular isotopic compositions in the Yubei 1 oil can be generally correlated with oils from the Lower Paleozoic petroleum system in the central Tarim Basin, the distributions of aryl isoprenoids suggested that the depositional environment of the Cambrian source rock in the southern Tarim Basin could be different from that in the central Tarim Basin, which worth a further in-depth study.
- oil origin /
- geochemical characteristics /
- hydrocarbon accumulation characteristics /
- oil-source correlation /
- Yubei area /
- Tarim Basin

HTML全文

图 1 塔里木盆地玉北1井构造位置^[23]

Figure 1. Location of well Yubei 1, Tarim Basin

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图 2 塔里木盆地玉北1井全油色谱特征

Figure 2. Chromatographic characteristics of whole oil from well Yubei 1, Tarim Basin

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图 3 塔里木盆地玉北1井原油中降三环萜烷、三环萜烷、25-降藿烷和藿烷化合物分布

Figure 3. Distributions of nor-tricyclic terpanes, tricyclic terpanes, 25-norhopanes and hopanes in crude oil from well Yubei 1, Tarim Basin

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图 4 塔里木盆地玉北1井(a)和沙116井(b)原油中芳基类异二烯烃分布

Figure 4. Distributions of aryl isoprenoids in crude oil from wells Yubei 1 (a) and Sha 116 (b), Tarim Basin

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图 5 塔里木盆地玉北1井原油中甾烷分布

Figure 5. Distribution of steranes in crude oil from well Yubei 1, Tarim Basin

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图 6 塔里木盆地玉北1井原油正构烷烃摩尔浓度分布

Figure 6. Distribution of n-alkanes as expressed by their molar concentrations in crude oil from well Yubei 1, Tarim Basin

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图 7 塔里木盆地部分井原油Pr/nC₁₇和Ph/nC₁₈比值

Figure 7. Cross-plots of Pr/nC₁₇ and Ph/nC₁₈ in crude oil from some wells, Tarim Basin

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图 8 塔里木盆地部分井原油正构烷烃分子碳同位素组成

Figure 8. Stable carbon isotopic compositions of n-alkanes in crude oil from some wells, Tarim Basin

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图 9 塔里木盆地部分井原油轻烃分布所揭示的环构化和芳构化程度

Figure 9. Cyclization and aromatization revealed by light hydrocarbon distribution in crude oil from some wells, Tarim Basin

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图 10 塔里木盆地部分井原油中三甲基萘、四甲基萘和五甲基萘异构体分布

Figure 10. Distribution of tri-, tetra-, and penta-methyln-aphthalenes in crude oil from some wells, Tarim Basin

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图 11 塔里木盆地玉北1井原油中芳烃分子碳同位素组成特征

注: DMN.二甲基萘，TMN.三甲基萘，Biph.联苯，Mebipb.甲基联苯

Figure 11. Stable carbon isotopic compositions of individual aromatic compounds in crude oil from well Yuebei 1, Tarim Basin

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