| 渤海湾盆地临南地区有效油气运聚系统分析 |
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| 引用本文： | 刘中云,唐洪三,林玉祥.渤海湾盆地临南地区有效油气运聚系统分析[J].高校地质学报,2000,6(3):447-455. |
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| 作者姓名： | 刘中云 唐洪三 林玉祥 |
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| 作者单位： | 1. 胜利油田， 山东 临邑 251507；2. 石油大学， 山东 东营 257061 |
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| 摘 要： | 临南地区原油来源于临南洼陷沙三段富有机质成熟烃源岩，其中部分原油受到轻微的生物降解和水洗作用。根据轻烃、生物标志物组成及油源对比结果，将临南洼陷分为南北两个油源区，在渐新世末和中新世末两期油气运聚过程中，形成了四个有效油气运聚系统。各运聚系统的油气沿一定主导方向运移，除已知油田外，位于该主导方向上的曲堤地垒是有利勘探方向。
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| 关 键 词： | 临南地区 原油特征 油源对比 油气运移 |
| 收稿时间： | 2000-09-20 |
| 修稿时间： | 2000-03-10 |
Study of Effective Migration and Accumulation System of Oil in Linnan Area, Bohai Gulf Basin |
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| LIU Zhong-yun,TANG Hong-san,LIN Yu-xiang.Study of Effective Migration and Accumulation System of Oil in Linnan Area, Bohai Gulf Basin[J].Geological Journal of China Universities,2000,6(3):447-455. |
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| Authors: | LIU Zhong-yun TANG Hong-san LIN Yu-xiang |
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| Institution: | 1. Shengli Oilfield，Shandong; 2. Petroleum University of China，Shandong Dongying 257061，China |
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| Abstract: | The working area in this article includes Linnan Sag and its surrounding areas. Oils with industrial value found at present all come from the Es3 Member located in depth of Linnan Sag. The sedimentary environment of the Es3 Member in Linnan Sag is deep to semi-deep lake facies with a condition of weak oxidation to oxidation. The content of oleanane detected in most samples shows that the source of organic matter has an input of high plant and the ratio of high plant to aquatic organism varies with the sedimentary facies of Es3 Member. In the water of south part pyrrophyta is more abundant.
The oil in Quti uplift has been subjected to light biodegradation and water washing in depth. Biodegradation and water washing did not affect the oil from Linnan oilfield. Oil from Qian-Guantun Structure is not affected by biodegradation also, but has a very low content of aromatics because of water washing. In Linpan oilfield only oil from the Guantao Formation suffered light biodegradation.
Although all oil from Linnan area has a common source, i.e. Es3 Member in Linnan Sag, some differences exist between oils from Linnan oilfiled, Quti oilfield, Linpan oilfiled and Shanghe oilfiled, etc. Therefore these oils can be divided into different origin types. Three types of oil are recognized, i.e. Linpan-Shanghe type, Linnan type and Quti type, according mainly to 4-methyl sterane content and also based on light and medium hydrocarbon composition and other biomarker characters of oils.
Two oil source areas，i.e. north part and south part oil source area， are recognized according to the results of comparison of oils and its source rocks and composition analyses of liquid inclusion enclave. The former has two stages of oil formation and expulsion and is the source of oil with lower 4-methyl sterane content and accumulated in Central Uplift. The later has only one phase of oil formation and expulsion and its oil has a high maturation level and a higher 4-methyl sterane content.
The system that can form industrial oil accumulation is called effective oil migration and accumulation system in this article. Four such systems are recognized. The system Ⅰ is formed at the end of Oligocene, its oil has a low 4-methyl sterane content and accumulated in Linpan and Shanghe oilfield. Other three systems are all formed during the peak period of oil formation of Es3 Member by the end of Miocene. The system Ⅱ also contributed to Linpan oilfiled with oil having low 4-methyl sterane content, the system Ⅲ formed Linnan oilfield and Qianguantun oil pool with oil having high 4-methyl sterane content, and the system Ⅳ resulted in Quti oilfiled with oil from both north source part and south source part and having medium 4-methyl sterane content.
According to the characters of all four systems and current level of exploration in Linnan area, the most favorable exploration area is Quti Uplift. |
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| Keywords: | effective oil migration and accumulation system Linnan area character of oil comparison of oil and its source rock exploratron region |
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