东濮凹陷北部盐湖相原油特征与成因

现代地质 ›› 2017, Vol. 31 ›› Issue (04): 768-778.

东濮凹陷北部盐湖相原油特征与成因

张洪安¹(), 李素梅²^,³(), 徐田武¹, 庞雄奇²^,³, 张云献¹, 万中华²^,³, 纪红²^,³

1.中国石化中原油田分公司,河南濮阳 457001
2.中国石油大学(北京) 资源与探测国家重点实验室,北京 102249
3.中国石油大学(北京) 地球科学学院,北京 102249

收稿日期:2016-09-07 修回日期:2016-11-24 出版日期:2017-08-10 发布日期:2017-09-15
通讯作者: 李素梅,女,教授,博士生导师,1968年出生,有机地球化学专业,主要从事油气与分子地球化学研究。Email: smli@cup.edu.cn。
作者简介:张洪安, 男,高级工程师, 1965年出生,石油地质学专业,主要从事沉积盆地分析及勘探研究。Email: Zhangha.zyyt@sinopec.com。
基金资助:
国家科技重大专项(2016ZX05006004);国家自然科学基金项目(41673055);国家自然科学基金项目(41473047)

Characteristics and Formation Mechanism for the Saline Lacustrine Oil from the North Dongpu Sag

ZHANG Hongan¹(), LI Sumei²^,³(), XU Tianwu¹, PANG Xiongqi²^,³, ZHANG Yunxian¹, WAN Zhonghua²^,³, JI Hong²^,³

1. SINOPEC Zhongyuan Oilfield Company,Puyang, Henan 457001, China
2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
3. College of Geosciences, China University of Petroleum, Beijing 102249, China

Received:2016-09-07 Revised:2016-11-24 Online:2017-08-10 Published:2017-09-15

摘要/Abstract

摘要：

东濮凹陷盐湖相油气成因与成藏机理研究薄弱。采用色谱/质谱(GC/MS)等常规技术,结合傅立叶变换离子回旋共振质谱、单体烃碳同位素技术,对东濮凹陷北部文明寨、卫城地区油气特征及其成因进行了解剖。结果表明,该区原油具有植烷对姥鲛烷优势显著、伽马蜡烷富集、升藿烷“翘尾”、甾烷异构化程度较低等咸水、盐湖相原油的典型特征。原油还具有正构烷烃单体烃碳同位素呈低碳重、高碳轻、近两段式分布的特征,与柴达木盐湖相原油有所差异。原油中检测到丰富的S₁、S₂、O₁S₁、N₁、O₁、O₂、O₃等芳构化程度较低的NSO化合物,其与该区低熟油的形成关系密切。油-油、油-岩详细对比表明,东濮凹陷北部原油主要来自埋深超过3 000 m的沙三—沙四段烃源岩、存在不同成熟度原油混合聚集现象。研究结果对该区进一步油气勘探具有重要指示意义。

关键词: 东濮凹陷, 盐湖相, 低熟油, 油源对比, 混源成藏

Abstract:

Conventional geochemical methods including GC/MS, Rock-eval combined with ESI FT-ICR MS and compound specific carbon isotopic analysis are used to reveal hydrocarbons generation and migration style for the saline lacustrine oils from the Wenmingzhai and Weicheng Oilfield in the North Dongpu Sag, Bohai Bay Basin, which is still unclear enough up to date. It was observed that the crude oils bearing typical characteristics of saline lacustrine oils such as predominance of phytane to pristine and C₃₅-hopane to C₃₄-hopane, enrichment of gammacerane, and low extent of isomerization of steranes. The oils are also featured by two-stage carbon isotope distribution of n-alkanes:the δ¹³C for the n-alkanes with carbon number less than 21 is ranged in -29‰ to -28‰, while those larger than 21 is ranged in -31‰ to -29‰, which is different from “parallel lines pattern” for the saline lacustrine oils from the Western Qaidam Basin, suggesting different paleoenvironment and precursors for the n-alkanes in the North Dongpu Sag. Abundant NSO’s compounds including S₁,S₂,O₁S₁,N₁,O₁,O₂ and O₃ with low extent of aromatization are detected from the oils analyzed, which were predicted having a close genetic relationship with the immature oils in the area. A detailed oil-oil and oil-source rock correlations showed that the crude oils analyzed are primarily derived from Es₃ and Es₄ source rocks with burial depth larger than 3 000 m. It was suggested that the crude oils are mixed by different source rocks with varied thermal maturity, which would be instructive for the further petroleum exploration in the area.

Key words: Dongpu Sag, saline lacustrine facies, immature oil, oil-source rock correlation, hydrocarbon accumulation with mixed sources

中图分类号:

P588
TE122.1

张洪安, 李素梅, 徐田武, 庞雄奇, 张云献, 万中华, 纪红. 东濮凹陷北部盐湖相原油特征与成因[J]. 现代地质, 2017, 31(04): 768-778.

ZHANG Hongan, LI Sumei, XU Tianwu, PANG Xiongqi, ZHANG Yunxian, WAN Zhonghua, JI Hong. Characteristics and Formation Mechanism for the Saline Lacustrine Oil from the North Dongpu Sag[J]. Geoscience, 2017, 31(04): 768-778.

图/表 10

图1 东濮凹陷北部区域构造及部分样品分布

Fig.1 Regional tectonic map of the North Dongpu Sag and partial samples distribution

表1 东濮凹陷北部部分原油基本地球化学参数

Table 1 Basic geochemical parameters of the oils analyzed in the North Dongpu Sag

图2 东濮凹陷北部部分原油饱和烃总离子流图

Fig.2 Total ion chromatogram (TIC) of saturated fraction in the oils analyzed in the North Dongpu Sag

图3 东濮凹陷北部原油m/z217、m/z191质量色谱图

Fig.3 Partial m/z217、m/z191 mass fragmentograms of saturated hydrocarbon fractions of the oils analyzed in the North Dongpu Sag

图4 基于ESI FT-ICR MS的东濮原油中的NSO化合物分布方框内数值系C29甾烷ααα20S/(S+R)、C29甾烷αββ/(ααα+αββ)

Fig.4 Distribution of NSOs compounds in the oils analyzed by ESI FT-ICR MS

图5 东濮凹陷北部、柴西原油单体烃碳同位素(柴西数据来自ZHU等,2005) [39]

Fig.5 Compound specific carbon isotope of n-alkane in the oils from the North Dongpu Sag and the Western Qaidam Basin

图6 东濮凹陷北部卫18-5井烃源岩、油砂饱和烃总离子流图

Fig.6 Total ion chromatogram (TIC) of saturated fraction in the oil-sand and potential source rocks from well Wei18-5

图7 东濮凹陷北部卫18-5井烃源岩、油砂m/z217质量色谱图图中深色、条纹色充注峰分别指示“生物型”、“地质型”;数字为共逸出峰中生物型/地质型的估算值

Fig.7 Partial m/z217、m/z191 mass fragmentograms of saturated hydrocarbon fractions of the oil-sand and potential source rocks from Well Wei18-5 in the North Dongpu Depression

图8 东濮凹陷北部烃源岩与相邻层位油砂成熟度及相关参数对比

Fig.8 Correlation of oil-sand and the adjacent potential source rocks about maturity and the relevant parameters for the samples from well Wei18-5 in the North Dongpu Sag

图9 东濮凹陷北部油、岩成熟度及相关参数对比

Fig.9 Correlation of oil-source rocks about maturity and the relevant parameters for the samples from the North Dongpu Sag

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