断陷内存在两种成因稠油：原生稠油和次生生物降解稠油。
Two kinds of genetic heavy oils could be found within the depression such as primary heavy oil and biodegraded heavy oil.
重质稠油藏的形成主要受盆地后期抬升活动、生物降解、地层水洗和氧化作用等因素控制。
The formation of heavy oil reservoirs is chiefly controlled by late uplifting of the basin, biodegradation, water-washing, and free oxygen oxidizing.
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