Formation Mechanism Analysis of
详细信息
- 责任者：Cheng Dingsheng (Research Institute of Petroleum Exploration and Development ; PetroChina ; Beijing 100083 ; China) ; Dou Lirong
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(4)
- 关键词：原油 ; crude oil ; 苏丹 ; Sudan
- 页码：p.1303-1312
- 图表：illus., 4 tables, 13 refs.
- 分类号：1003
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Crude oils produced from the Muglad and Melut basins, which are hydrocarbon-rich basins in Sudan, even in the Central-West African Shear Zone(CASZ), display unusually high total acid number values (TAN, up to 16 mg KOH/g oil) with high wax content and asphaltene. In order to probe the formation mechanism of Sudan high TAN oils, the authors picked up 18 oils with different TANs to analyze the composition of organic acids of crude oil by electrospray ionization fourier transform ion cyclotron resonance mass spectrometry. The research results indicated that the organic acid is consisted mainly of naphthenic acid which relative molecular weight increased gradually with the increment of biodegradation degree. The naphthenic acid of high TAN oils is consisted mainly of mono-cyclic, bi-cyclic, tri-cyclic naphthenic acid. The key reason for forming high TAN oils is only biodegradation.