| 准噶尔盆地莫索湾地区原油地球化学特征及成因分析 |
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| 引用本文： | 李二庭, 陈俊, 曹剑, 魏霞, 张宇, 张晓刚, 王海静. 准噶尔盆地莫索湾地区原油地球化学特征及成因分析[J]. 石油实验地质, 2022, 44(1): 112-120. doi: 10.11781/sysydz202201112 |
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| 作者姓名： | 李二庭 陈俊 曹剑 魏霞 张宇 张晓刚 王海静 |
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| 作者单位： | 1.新疆砾岩油藏实验室, 新疆 克拉玛依 834000;;2.中国石油 新疆油田分公司 实验检测研究院, 新疆 克拉玛依 834000;;3.南京大学, 南京 210003 |
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| 基金项目： | 国家油气重大专项(2017ZX05001-004);中国石油重大工程技术现场试验项目(2019F-33)资助。 |
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| 摘 要： | 为明确准噶尔盆地莫索湾地区原油成因及影响原油性质差异的控制因素，揭示研究区油气成藏规律，开展了原油饱和烃生物标志物和单体烃碳同位素组成分析，以及混源油模拟配比实验。莫索湾地区盆5井区原油碳同位素偏重，Pr/Ph值更大（1.4~1.9），金刚烷异构化指标偏高，说明盆5井区原油成熟度高于盆参2井区原油，且水体沉积环境更偏氧化性。莫索湾地区原油C7轻烃以甲基环己烷组分占优势，含量大于40%，ααα构型的规则甾烷分布中均以C29规则甾烷含量占优势，相对含量大于40%，表明其生烃母质均以陆相偏腐殖型为主。盆5井区和盆参2井区原油正构烷烃碳同位素值组成及分布曲线基本相同，表明其来源整体一致，且与典型下乌尔禾组烃源岩整体较为相似；但下乌尔禾组烃源岩不同碳数正构烷烃碳同位素值跨度较大，达4.6‰，而莫索湾地区原油中不同碳数正构烷烃碳同位素值跨度有所差异，分布在2.2‰~3.0‰之间，认为主要是不同期次充注原油比例不同造成的。混源油生物标志物定量计算结果表明，莫索湾地区原油主要来源于晚期高成熟下乌尔禾组烃源岩，混有早期成熟风城组烃源岩贡献，其中，盆5井区和盆参2井区原油中高成熟下乌尔禾组烃源岩贡献分别大于80%和60%。混源比例不同是造成莫索湾地区不同区域原油地球化学特征表现差异的主要原因。
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| 关 键 词： | 金刚烷 单体烃碳同位素 生物标志物 混源油 莫索湾地区 准噶尔盆地 |
| 收稿时间： | 2020-12-14 |
| 修稿时间： | 2021-11-26 |
Geochemical characteristics and genetic analysis of crude oils in Mosuowan area,Junggar Basin |
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| LI Erting, CHEN Jun, CAO Jian, WEI Xia, ZHANG Yu, ZHANG Xiaogang, WANG Haijing. Geochemical characteristics and genetic analysis of crude oils in Mosuowan area, Junggar Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(1): 112-120. doi: 10.11781/sysydz202201112 |
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| Authors: | LI Erting CHEN Jun CAO Jian WEI Xia ZHANG Yu ZHANG Xiaogang WANG Haijing |
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| Affiliation: | 1. Xinjiang Laboratory of Petroleum Reserve in Conglomerate, Karamay, Xinjiang 834000, China;;2. Research Institute of Experiment and Testing, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China;;3. Nanjing University, Nanjing, Jiangsu 210003, China |
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| Abstract: | Analysis of the biomarkers of saturated hydrocarbon and related compound specific carbon isotopes of crude oils were carried out for the research of origin of oils and controlling factors of oil properties in the Mosuowan area of the Junggar Basin, and mixed-source oil simulation was also carried out to reveal hydrocarbon accumulation in the study area. The carbon isotope of crude oil in the Pen 5 well block is relatively heavy, the Pr/Ph value is higher, between 1.4 and 1.9, and the index of adamantane isomerization is greater, indicating that the oil maturity of the Pen 5 well block is higher than that of the Pencan 2 well and had a more oxidative sedimental environment. The C7 light hydrocarbons of oil of the Mosuowan area are dominated by methylcyclohexane, with a content over 40%, and the distributions of regular steranes are dominated by C29 homologues with a content over 40%. Crude oils in the study area are thus indicated to be generated from terrestrial partial humus source rocks. The carbon isotope compositions and distribution of n-alkanes in the Pen 5 and Pencan 2 well blocks are similar, indicating that they were from the comparable sources, and they are generally similar to the source rocks in the Lower Wuerhe Formation. But the carbon isotope values of n-alkanes with different carbon numbers in the source rocks of the Lower Wuerhe Formation have a large span, reaching 4.6‰, while the carbon isotope values of n-alkanes with different carbon numbers of crude oil in the Mosuowan area have a smaller span, between 2.2‰ and 3.0‰. It is mainly caused by the different mixing ratio of crude oil. The quantitative calculation results of biomarkers in mixed-source oil showed that crude oil in the Mosuowan area was mainly derived from the late high-maturity source rocks in the Lower Wuerhe Formation, mixed with those from the early mature source rocks in the Fengcheng Formation. Among them, the high-maturity source rocks in the Lower Wuerhe Formation have a relatively greater contribution to crude oil in the Pen 5 well block, around 80%, and contribute about 60% to crude oil in the Pencan 2 well block. As a result, it is concluded that different proportions of mixed sources are the main reason which caused differences in the geochemical characteristics of crude oil in the Mosuowan area. |
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| Keywords: | diamondoid carbon isotopic compositions of monomer hydrocarbon biomarker oil of mixed sources Mosuowan area Junggar Basin |
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