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对松辽盆地滨北地区、主力烃源岩区(齐家—古龙凹陷和三肇凹陷)、主力烃源岩层(白垩系青山口组一段、青二段—青三段)成烃转化率-埋深关系曲线及Ro-埋深关系曲线进行了系统分析,重新厘定盆地生油门限深度。结果表明,松辽盆地主力烃源岩的生油门限深度可能为1 400~1 700 m,而不是过去认为的1 200 m左右。生油门限深度的变化对盆地各地区资源潜力和勘探方向具有不同的影响:对于主力烃源岩区,生油门限变深,将使评价所得生、排烃量减少,但对资源潜力没有明显影响,可能影响对勘探方向和有利目标的评价;对于烃源岩埋藏相对较浅的滨北地区,生油门限变深,勘探潜力、勘探方向、有利目标评价将受到至关重要的影响;对于盆地内抬升剥蚀量较大的东南隆起区,生油门限变浅,约为700m,将明显提升朝阳沟阶地、长春岭背斜和宾县—王府地区的勘探潜力。图14参21
In the Binbei area of Songliao Basin, the main hydrocarbon source rocks (Qijia-Gulong Sag and Sanzhao Sag), the main hydrocarbon source rocks (Cretaceous Qingshankou Formation, Qing 2 Member - Qing 3 Member) Depth relationship curve and Ro-buried depth curve were systematically analyzed to re-determine the oil production threshold depth. The results show that the source depth of the main source rocks in the Songliao Basin may be from 1 400 to 1 700 m instead of about 1 200 m in the past. The variation of the threshold depth of oil generation has different effects on the resource potential and exploration direction in different regions of the basin. For the main hydrocarbon source rock area, the threshold of oil generation becomes deeper, which will reduce the amount of hydrocarbon generation and expulsion, but have no obvious potential for resources Impact on the exploration direction and favorable targets may be affected. For the relatively shallow buried source rock in Binbei area, the threshold of oil generation will become deeper and the exploration potential, exploration direction and favorable target assessment will be critically affected. For the basin Within the uplift of the southeast uplift with large amount of denudation, the threshold of oil generation will be shallow, about 700m, which will obviously enhance the exploration potential of the Chaoyanggou terrace, Changchunling anticline and Binxian-Wangfu area. Figure 14 reference 21