Diagenetic Bitumen in Ordovician Carbonate Reservoirs of the Northern Tarim Basin
详细信息
- 责任者：Zhang Nai (Research Institute of Petroleum Exploration & Development ; PetroChina ; Beijing 100083 ; China) ; Wang Zhaoming
- 刊名：Acta Petrolei Sinica
- 出版年：2013
- 卷期：34(2)
- 关键词：沥青 ; asphalt ; 塔里木盆地 ; Tarim Basin
- 页码：p.225-231
- 图表：illus., 20 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
摘要
According to the relationship between the relative intensity of D-peak,G-peak and G-D peak spacing of bitumens and the maturity of bitumen evolution,we deduced that the Dh/Gh ratio and G-D peak spacing are positively proportional to bitumen maturity.Bitumens in Ordovician reservoir in the northern Tarim Basin are thought to have evolved in three stages and the Dh/Gh ratio and G-D peak spacing of Raman measurements on these bitumens indicated that the first-stage bitumen is highly-mature carbonaceous reservoir bitumen,the second-stage one is mature asphaltene reservoir bitumen,and the third-stage one is a combination of overmature oily reservoir bitumen and asphaltene reservoir bitumen.The formation of the first-and second-stage bitumens is attributed to thermal metamorphism,while the co-existence of two different bitumens for the third-stage bitumen is mainly due to selective adsorption of rocks.The distribution and property of these three-stages bitumens in Ordovician reservoirs of the northern Tarim Basin may determine the nature of Ordovician reservoirs,which is characterized by the southern condensate oil later than the northern heavy oil.The observation of oily reservoir bitumen in the northern Halahatang-Yingmaili region can provide evidence and targets for exploring Himalayan condensate oil reservoirs in this area.