BASIN EVOLUTION STAGES AND OIL AND GAS ENRICHMENT——TAKING THE LOWER TERTIARY BASINS IN THE EASTERN CHINA AS AN EXAMPLE
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摘要: 从我国东部几个典型的第三系含油气盆地石油地质演化出发,将盆地石油地质演化过程分为整体下降、整体上升和整体调整3个阶段。盆地整体下降阶段是物质积累过程和能量储备过程,亦即是油气形成过程;盆地整体上升阶段是能量释放,即油气成藏过程;盆地调整阶段是能量调整、物质补偿和综合平衡的过程。通过对盆地内各凹陷在上述不同演化阶段的特征分析,对比了东部各富油凹陷(盆地)石油地质演化的差异性。总结我国东部各富油凹陷油气富集的主要控制因素,认为地层发育系列完整,沉积规模和剥蚀量适中的盆地含油气性最好。Abstract: According to petroleum geology evolution of several typical Tertiary basins in the east of China,the process of basin evolution may be divided into three stages of whole descending,whole ascending and whole adjusting.Basin descending stage is the process of material accumlation and energy storage,which causes hydrocarbon formation.Basin ascending stage is the process of energy release and oil and gas reservoir formation.Basin adjusting stage is the process of energy adjusting and material equalization.Based on the analysis of each depression's characters in the basins during the above different evolution stages,we compared the differences of petroleum geology evolution of the oil-rich depressions in the eastern China,and summarized the main control factors of oil and gas enrichment in depressions in the eastern China.It is considered that oil and gas enrich in the basins with full stratigraphic system,moderate sedimentation and denudation.
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