塔河油田奥陶系原油C<sub>26</sub>降胆甾烷分布特征及地质意义

李美俊; 王铁冠; 张卫彪

doi:10.11781/sysydz201501064

塔河油田奥陶系原油C₂₆降胆甾烷分布特征及地质意义

doi: 10.11781/sysydz201501064

1.
油气资源与探测国家重点实验室中国石油大学(北京) 地球科学学院, 北京 102249
2. 中国石化石油勘探开发研究院, 北京 100083

基金项目: 国家自然科学基金项目(41272158)和油气资源与探测国家重点实验室项目(PRP/indep-2-1302)资助.

详细信息

作者简介:
李美俊(1972―),男,博士,教授,博士生导师,从事油藏地球化学及环境化学教学和研究.E-mail:meijunli@cup.edu.cn.

中图分类号: TE122.1
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出版历程
- 收稿日期: 2014-08-29
- 修回日期: 2015-01-04
- 刊出日期: 2015-01-28

Distribution of C₂₆ norcholestanes in Ordovician crude oils from Tahe Oilfield and its geological significance

1.
State Key Laboratory of Petroleum Resources and Prospecting, College of Geosciences, China University of Petroleum, Beijing 102249, China
2. SINOPEC Petroleum Exploration & Production Research Institute, Beijing 100083, China

摘要

摘要: 塔河油田奥陶系原油中都检测出丰富的C₂₆降胆甾烷系列.大多数原油24-降胆甾烷含量相对27-降胆甾烷低,而九区T904和塔东地区TD2井原油24-降胆甾烷含量相对较高.以LN46、BD2等井为代表的上奥陶统灰岩、泥灰岩具有类似于塔河油田奥陶系原油的C₂₆降胆甾烷分布特征,而以TD2井、和4井及柯坪露头为代表的寒武系黑色泥岩和灰色灰岩具有类似于T904和TD2井原油的C₂₆降胆甾烷分布特征.该文提出判识寒武系烃源层油气来源的C₂₆降胆甾烷地球化学判识标准为:NCR[24/(24+27)-降胆甾烷]>0.50,NDR[24/(24+27)-降重排胆甾烷]>0.35;上奥陶统烃源层油气来源的C₂₆降胆甾烷判识标准为:NCR<0.40,NDR<0.35.结果表明C₂₆降胆甾烷不仅是塔河油田奥陶系油藏进行原油族群划分的特征分子标志物,也为研究硅藻、沟鞭藻等藻类的起源和演化以及塔里木盆地古板块构造运动提供了有力的分子地球化学证据.
- 降胆甾烷 /
- 硅藻 /
- 沟鞭藻 /
- 寒武系 /
- 塔里木盆地
Abstract: A series of C₂₆ norcholestanes was detected in the Ordovician crude oils from the Tahe Oilfield, the Tarim Basin, northwest China. The abundance of 24-norcholestanes in most of the Ordovician crude oils was lower than that of 27-norcholestanes. The oils from well T904 in the eastern Tahe Oilfield and well TD2 in the eastern Tarim Basin, however, were characterized by relatively higher 24-norcholestane abundance. The distribution of C₂₆ norcholestane of the Upper Ordovician marls from the wells LN46 and BD2 resembled that of the most Ordovician crude oils from the Tahe Oilfield. The distribution of C₂₆ norcholestanes in typical Cambrian black shales and gray limestones from the wells TD2, He4 and outcrops from Keping profile resembled that of the crude oils from the wells T904 and TD2. Criteria are proposed relative to C₂₆ norcholestanes that could be used to classify oil families within the Ordovician reservoirs. Oils with NCR (defined as 24/(24+27)-norcholestanes) >0.50 and NDR (defined as 24/(24+27)-nordiacholestanes) >0.35 were thought to be derived from the Cambrian source rocks, and oils with NCR<0.40 and NDR<0.35 were thought to be derived from the Upper Ordovician source rocks. Therefore, C₂₆ norcholestanes were effective molecular markers to classify oil genetic families in the Tahe Oilfield. They could also provide molecular evidence for the origin and evolution of diatoms and dinoflagellates and the plate drift of the Tarim Basin.
- norcholestane /
- diatom /
- dinoflagellate /
- Cambrian /
- Tarim Basin

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