Genetic Types and Densification Series of Heavy Oils in Non-Marine Basins: A Case Study on Erlian Basin
详细信息
- 责任者：Gao Risheng (Research Institute of Petroleum Exploration and Development ; PetroChina ; Beijing 100083 ; China) ; Fang Jie
- 刊名：Acta Petrolei Sinica
- 出版年：2013
- 卷期：34(3)
- 关键词：重油 ; heavy oil ; 油气藏形成 ; reservoir formation ; 二连盆地 ; Erlian Basin
- 页码：p.479-488
- 图表：illus., 3 tables, 37 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
摘要
Based on the analyzing physical properties and geochemical characteristics of heavy oils from Erlian Basin and integrated with some typical cases of heavy oils from other basins,we discussed main controlling factors for the heavy oil formation and concluded that heavy oils can be generally divided into two kinds,the primary one and the secondary,the former generates from immature or low-maturity oils formed during the thermal evolution process of organic matter,while the latter is an oil with high density and viscosity that forms due to a variety of densification after a crude oil(conventional oil or ordinary heavy oil) migrates into a reservoir and accumulates under different preserved conditions.The densification includes mainly biodegradation,water washing,oxidation,pyrolysis and differentiation during migration and accumulation.In stages of oil migration,accumulation and preservation,a variety of densification mentioned above often mingles with each other.Only in some specific geological conditions,can a single densification factor be relatively prominent.In most basins or regions,biodegradation usually plays a dominate role during the formation of heavy oils,and is followed by oxidation,water washing,pyrolysis and differentiation during migration and accumulation.Based on the statistics of heavy oil data in this area,a densification series of heavy oils was summed up that low-maturity heavy oil(viscosity 100～500 mPa·s),immature heavy oil(viscosity 500～1 000 mPa·s) and slightly biodegraded heavy oil(viscosity 800～2 000 mPa·s) are ordinary heavy oils;while moderately biodegraded heavy oil(viscosity 2 000～20 000 mPa·s) is either an ordinary heavy oil or heavy mass oil;severely biodegraded heavy oil(viscosity 20 000～100 000 mPa·s) is a heavy mass oil;and super severely biodegraded heavy oil(viscosity>100 000 mPa·s) is an overweight mass oil.
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