鄂尔多斯盆地靖边油田西部延9原油地球化学特征与油源

张海; 雷华伟; 张涛; 白玉彬

doi:10.11781/sysydz201806836

鄂尔多斯盆地靖边油田西部延9原油地球化学特征与油源

doi: 10.11781/sysydz201806836

张海^1,2,
雷华伟¹,
张涛¹,
白玉彬^3, ,

1. 延长油田股份有限公司靖边采油厂, 陕西榆林 718500;
2. 西南石油大学地球科学与技术学院, 成都 610500;
3. 西安石油大学地球科学与工程学院, 西安 710065

基金项目:

陕西省自然科学基础研究计划资助项目（2017JM4014）和陕西省教育厅科研计划项目（18JS090）共同资助。

详细信息

作者简介:
张海(1982-),男,硕士,高级工程师,从事油田勘探开发工作。E-mail:403837370qq.com。

通讯作者:
白玉彬(1981-),男,博士,副教授,从事致密油形成机理与富集规律研究。E-mail:baiyubin@xsyu.edu.cn。

中图分类号: TE122.11
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出版历程
- 收稿日期: 2018-04-16
- 修回日期: 2018-09-06
- 刊出日期: 2018-11-28

Geochemical characteristics of Yan 9 crude oil and oil-source correlation in western Jingbian Oil Field, Ordos Basin

ZHANG Hai^1,2,
LEI Huawei¹,
ZHANG Tao¹,
BAI Yubin^{3
, ,}

1. Jingbian Oil Production, Yanchang Oil Field Corporation, Yulin, Shaanxi 718500, China;
2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
3. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China

摘要

摘要: 为了明确靖边油田西部延9油藏石油的来源，采用原油物性、族组成、饱和烃色谱及色谱-质谱等方法，分析了延9原油地球化学特征，通过对比本区长7烃源岩与湖盆中心志丹地区长7烃源岩地球化学特征，结合区域地质背景研究了延9油藏石油的来源。结果表明，延9原油饱和烃含量均在60%以上，正构烷烃单峰分布，主峰碳主要以C₂₁为主；生物标志物中C₃₀藿烷占优势，其次为C₂₉藿烷，规则甾烷以C₂₉为主，C₂₇和C₂₈含量相似，呈不对称“V”字型分布。延9原油地球化学特征相似，具有统一的物质来源和演化程度，为淡水条件下弱氧化-还原环境形成的成熟原油。油源对比表明，靖边油田本地长7烃源岩与延9原油具有明显的亲缘关系，延长组沉积时期位于湖盆中心的志丹地区长7烃源岩地化特征与延9原油差异明显。延9油藏的形成主要为本地区长7烃源岩成熟后，经叠置砂体及裂缝系统输导，主要经垂向运移至延9储层，再经过短距离侧向运移至圈闭聚集成藏。
- 地球化学特征 /
- 延9原油 /
- 长7烃源岩 /
- 油源对比 /
- 靖边油田 /
- 鄂尔多斯盆地
Abstract: The geochemical characteristics of the Yan 9 reservoir were analyzed by means of petrophysical properties, hydrocarbon group composition, saturated hydrocarbon chromatography and gas chromatography-mass spectrometry in order to clarify the source of oil in the Yan 9 reservoir in the west of Jingbian Oil Field. The geochemical characteristics of Chang 7 source rocks in the study area and the Zhidan area were compared, and the source of Yan 9 oil was studied in combination with regional geological background. The results showed that the saturated hydrocarbon content of Yan 9 crude oil is above 60%, and the n-alkanes are distributed with a single mode with C₂₁ as the main carbon peak, C₃₀ hopane as the dominant biomarker, followed by C₂₉ hopane. Regular steroids are mainly C₂₉, while C₂₇ and C₂₈ are similar, showing an asymmetric "V" distribution. The Yan 9 crude oil has similar geochemical characteristics and unified material source and evolution degree. It is a mature crude oil derived from a source deposited in a weak oxidation-reduction environment under freshwater conditions. Oil-source correlation showed that the source rocks of the Chang 7 reservoir in the Jingbian Oil Field are related to the Yan 9 crude oil, and the geochemical characteristics of the Chang 7 source rocks in the Zhidan area, which is located in the center of the lacustrine basin, are obviously different from the Yan 9 crude oil. The formation of Yan 9 oil is mainly due to the maturation of Chang 7 source rocks in this area. The oils were transported by superimposed sand bodies and fracture systems, migrated vertically to the Yan 9 reservoir, and then migrated laterally to traps for accumulation.
- crude oil geochemistry /
- Yan 9 crude oil /
- Chang 7 source rock /
- oil-source correlation /
- Jingbian Oil Field /
- Ordos Basin

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