准噶尔盆地莫索湾地区原油地球化学特征及成因分析

李二庭; 陈俊; 曹剑; 魏霞; 张宇; 张晓刚; 王海静

doi:10.11781/sysydz202201112

准噶尔盆地莫索湾地区原油地球化学特征及成因分析

doi: 10.11781/sysydz202201112

李二庭^{1, 2,},
陈俊^{1, 2},
曹剑³,
魏霞^{1, 2},
张宇^{1, 2},
张晓刚^{1, 2},
王海静^{1, 2}

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

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

详细信息

作者简介:
李二庭(1988-), 男, 博士, 高级工程师, 从事油气地球化学研究工作。E-mail: lierting@petrochina.com.cn

中图分类号: TE122.11
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- 文章访问数: 412
- HTML全文浏览量: 83
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-14
- 修回日期: 2021-11-26
- 刊出日期: 2022-01-28

Geochemical characteristics and genetic analysis of crude oils in Mosuowan area, Junggar Basin

LI Erting^{1, 2
,},
CHEN Jun^{1, 2},
CAO Jian³,
WEI Xia^{1, 2},
ZHANG Yu^{1, 2},
ZHANG Xiaogang^{1, 2},
WANG Haijing^{1, 2}

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

摘要

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。
- 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
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.
- diamondoid /
- carbon isotopic compositions of monomer hydrocarbon /
- biomarker /
- oil of mixed sources /
- Mosuowan area /
- Junggar Basin

HTML全文

图 1 准噶尔盆地莫索湾地区及采样井位置

Figure 1. Sampling wells in Mosuowan area, Junggar Basin

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图 2 准噶尔盆地莫索湾地区原油碳同位素及链烷烃组成分布

Figure 2. Distribution of carbon isotopes and paraffin composition of crude oil in Mosuowan area, Junggar Basin

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图 3 准噶尔盆地莫索湾地区原油C₇轻烃及规则甾烷组成分布

Figure 3. Composition of C₇ light hydrocarbons and regular steranes of crude oil in Mosuowan area, Junggar Basin

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图 4 准噶尔盆地莫索湾地区原油生物标志物组成特征

Figure 4. Biomarker composition of crude oil in Mosuowan area, Junggar Basin

下载: 全尺寸图片幻灯片

图 5 准噶尔盆地莫索湾地区原油金刚烷异构化指标(a, b)和浓度指标(c, d)

DMAI-1=1,3-二甲基单金刚烷/(1,3-二甲基单金刚烷+1, 2-二甲基单金刚烷)；MAI=1-甲基单金刚烷/(1-甲基单金刚烷+2-甲基单金刚烷)；MDI=4-甲基双金刚烷/(4-甲基双金刚烷+1-甲基双金刚烷+3-甲基双金刚烷)；EAI=1-乙基单金刚烷/(1-乙基单金刚烷+2-乙基单金刚烷)；A为单金刚烷含量；1-MA为1-甲基单金刚烷含量；1,3-DMA为1,3-二甲基单金刚烷含量；MAs为甲基单金刚烷类总含量；DMAs为二甲基单金刚烷类总含量

Figure 5. Adamantane isomerization index (a, b) and concentration index (c, d) of crude oil in Mosuowan area, Junggar Basin

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图 6 准噶尔盆地莫索湾地区原油与烃源岩中正构烷烃碳同位素组成特征

Figure 6. Carbon isotopic composition of n-alkanes in crude oil and source rocks in Mosuowan area, Junggar Basin

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图 7 准噶尔盆地莫索湾地区前哨1井(a-c)和基003井(d-f)端元油质量色谱图

Figure 7. Chromatogram of oils from wells Qianshao-1(a-c) and Ji-003(d-f) in Mosuowan area, Junggar Basin

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图 8 准噶尔盆地莫索湾地区成熟风城组来源与高成熟下乌尔禾组来源混源油生物标志物定量图

Figure 8. Quantitative diagram of biomarkers of mixed-source oil from mature Fengcheng Formation and high-maturity Lower Wuerhe Formation in Mosuowan area, Junggar Basin

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图 9 准噶尔盆地莫索湾地区盆5井—莫10井油气成藏模式

Figure 9. Reservoir-forming model of wells Pen5 and Mo10 in Mosuowan area, Junggar Basin

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表 1 准噶尔盆地莫索湾地区混源油比例判识参数

Table 1. Identification parameters of mixed-source oil ratio in Mosuowan area, Junggar Basin μg/g

判识参数	判识项目	混源比例(成熟P₁f∶高成熟P₂w)
判识参数	判识项目	10∶0	0∶10	8∶2	6∶4	4∶6	2∶8
β-胡萝卜烷	盐度	1 910.70	181.57	1 424.41	1 082.41	617.37	522.54
伽马蜡烷	盐度/分层	194.35	17.08	114.67	99.47	54.88	41.44
γ-胡萝卜烷	盐度	566.84	69.72	372.78	315.98	206.41	139.45
25-降藿烷	降解	71.61	0	43.11	34.94	20.61	17.08
Tm	成熟度	200.91	8.48	136.97	109.26	69.27	47.74
C₃₀藿烷	母质类型	647.36	51.80	499.38	364.15	234.64	177.34
注：成熟P₁f来源油采自基003井；高成熟P₂w来源油采自前哨1井。

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