| 准噶尔盆地中部III 区块原油中25-降藿烷分布特征与成因意义 |
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| 关键词:crude oil-types biodegradation 25-norhopanes genetic mechanism Junggar basin |
| 基金项目:国家重点基础研究发展计划(973)项目(编号:2006CB202303) |
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| 摘要: |
| The Distribution and Genetic Mehhanism of 25-Norhopane from the Ⅲ block in Central Junggar Basin |
| Geochemical characteristics of saturated and aromatic hydrocarbons from crude oil or core extracts in the Ш block of Junggar basin were investigated by gas chromatography-mass spectrometry,and the distribution of 25-norhopanes was studied.The results indicate that the relative abundances of 25-norhopanes differ clearly and so there are distinct levels of biodegradation in different wells or even along the vertical variation of one well.Along the structural belt from the south to the north,the biodegradation of the crude oils in the same formation becomes severer in sequence.For example,the relative abundance of the 25-norhopanes is higher in Jurassic crude oil of Yong 1 well and Yong 3 well in the upper structural section(the relative upper structural section),but it is lower in Jurassic and Cretaceous oil layers of Yong 6 well(the relative lower structural section).And also the levels of biodegradation changes increase with depth.The relative abundance of 25-norhopanes in Xishanyao Formation crude oil is higher at the surface of Yong 2 well,but it is lower in crude oil from the bottom of Xishanyao Formation in Yong 2 well.Based on characteristics of biodegradation and adjustment of Chepaizi-Mosuowan paleo-uplift,the genetic mechanism of oil/gas reservoir biodegradation was studied. |
| QIN Li-ming,ZHANG Huan-zhi,LI Wei,YANG Yong-cai,YUAN Dong-shan.2008.The Distribution and Genetic Mehhanism of 25-Norhopane from the Ⅲ block in Central Junggar Basin[J].Acta Geoscientica Sinica,29(4):478-485. |
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