| 南羌塘坳陷古油藏原油生物降解作用及意义 |
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| 关键词:Qiangtang Basin petroleum geochemistry biodegradation 25-norhopanes oil charging period |
| 基金项目:陕西延长石油(集团)有限责任公司“北羌塘坳陷基本石油地质特征与勘探潜力”项目(编号: YJKTS22SFW0001) |
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| 摘要: |
| Biodegradation of Crude Oil in Paleo-oil Reservoirs in South Qiangtang Basin and Its Significance |
| We conducted organic geochemical analysis of the paleo-oil reservoirs in the south Qiangtang Basin and discussed the biodegradation characteristics and charge timing of these reservoirs in terms of the characteristics of biomarkers and geological conditions. The distribution of n-alkanes in the paleo-oil reservoirs is complete, but the chromatographic baseline rises to different degrees, forming a “bulge”, indicating that the paleo-oil reservoirs have suffered a certain degree of biodegradation. The inversion of the carbon isotopes of the components and the widespread detection of 25-norhopanes also confirmed that the paleo-oil reservoir has experienced moderate to severe biodegradation. However, the saturated hydrocarbon chromatogram of samples from the paleo-oil reservoir show that the normal alkanes are relatively complete, indicating that the reservoir may have experienced two stages of crude oil charging. In the first stage, the crude oil was subject to biodegradation, and in the second stage, the crude oil retained relatively complete normal alkanes. The paleo-oil reservoir has experienced two stages of oil charging, which is consistent with the processes of hydrocarbon generation and expulsion of organic rich shale in the south Qiangtang Basin. |
| YU Jun,LI Na,HU Chun-qiao,HUANG Feng,ZHANG Hong-mei.2023.Biodegradation of Crude Oil in Paleo-oil Reservoirs in South Qiangtang Basin and Its Significance[J].Acta Geoscientica Sinica,44(6):1053-1061. |
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