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常用的有机质热成熟度指标反映了时间和温度的累积效果。用这些指标确定出的生油窗门限值只反映生油窗随时间变化后的目前情况。但是,人们发现生油岩越年轻,其顶部温度反而越高。这也就是说,较老的生油岩可能经历了比目前生油窗高得多的温度;在大多数沉积盆地中,随着地质时间的推移,生油窗垂直向上移动到深度较浅、温度较低的生油岩中。
Commonly used organic matter thermal maturity indicators reflect the cumulative effect of time and temperature. The limits of the oil window determined by these indicators only reflect the current situation of the oil window as time changes. However, the younger the source rock, the higher the temperature at the top of the rock. This means that older source rock may have experienced temperatures much higher than current oil production windows; in most sedimentary basins, as the geologic time progresses, the oil production window moves vertically upwards to a shallow depth, Lower temperature in the source rock.