MATURITY STUDY OF THE STRONG BIODEGRADATION VISCOUS OIL：TAKING THE SANTAI-BEISANTAI AREA OF JUNGGAR BASIN AS AN EXAMPLE
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摘要: 严重生物降解作用形成的稠油轻重组分均遭损失,其演化阶段性判识是油气成因研究的一个难题。该文以准噶尔盆地三台—北三台地区为例,在前人研究的基础上,进一步对Ts/Tm对成熟度的敏感性进行了分析,认为在同源条件下,Ts/Tm能有效的随成熟度增大而增大,且抗生物降解能力强,可以用来对严重生物降解原油成熟度进行判识。文章以此为指标指出三台—北三台地区重质稠油和储层沥青主要是低—未成熟阶段的原油并遭严重生物降解所致,中质稠油主要是成熟阶段原油遭中等生物降解或散失所致。Abstract: When the oil is suffered from strong biodegradation,most hydrocarbon component(including sterane) is loss,and the common maturity parameters can hardly play their roles.So,how to distinguish the maturity of the strong biodegradation oil is one of the research puzzles.Based the previous research,this paper takes the Santai-Beisantai area of the Junggar Basin for example,analyses the dependability of Ts/Tm.It is pointed out that Ts/Tm increases with maturity and is hard to be biodegraded,and can be used to distinguish the maturity of different type of crude oil.The bitumen and heavy oil derived from the result that the crude oil at low evolutionary stage suffered from loss and strong biode-gradation.The medium density oil comes from the result that oil at mature evolutionary stage suffered from loss and moderate biodegradation.
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Key words:
- biodegradation /
- reservoir bitumen /
- maturity of crude oil /
- Ts/Tm Santai-Beisantai region /
- Junggar Basin /
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