摘要
通过运用Basin2盆地模拟软件,模拟东营凹陷的烃类流体热演化表明,该凹陷为高地温梯度沉积盆地,古地温梯度值随着地质年代的更新逐渐下降。研究区下第三系地层中内部洼陷地温梯度较凹陷的凸起区以及南缓坡带、北陡坡带低,同时南缓坡带的地温梯度比北陡坡带较高。因此,隆起区的生油门限要起比洼陷处略浅些,在时间上隆起区的生油门限要起比洼陷处也略早。东营凹陷的烃源岩属于东营组、沙河街组和孔店组,但主力烃源岩主要来属于孔店组地层、沙河街组沙四段和沙三段。从区域上来看,烃源岩分布主要是在沉积厚度大的洼陷内,并已经进入生油高峰,而凹陷凸起区和缓坡带以及陡坡带的烃源岩主要属于低成熟阶段。
The thermal evolution modeling of hydrocarbon fluids in the Dongying depression based on basin-2 software indicates that the depression is a sedimentary basin with high geothermal gradient. The paleogeothermal gradient reduced with reduction in age. paleogeothermal gradient in the sag area was lower than that in uplift area in the basin, and geothermal gradient in the south slope zone was higher than that in north slope zone. Source rock in the Dongying depression belongs to Dongying, Shahejie and Kongdian Formations, but main source rock belongs to the Kongdian Formation and the 4th and 3rd Members of the Shahejie Formation. Most of source rock is within the sag area. The source rock in the uplift and slope zones is low in maturity.
出处
《四川地质学报》
2009年第4期481-483,共3页
Acta Geologica Sichuan
关键词
Basin2
烃类流体热演化
东营凹陷
basin-2
thermal evolution modeling of hydrocarbon fluids
Dongying depression
