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东濮凹陷上第三纪以来的沉积厚度超过东营末剥蚀厚度,为明显的沉积过补偿,决定了下第三系烃源岩热演化特征在垂向上分为明显的两段:下段地层在东营沉积末达到最大古地温,晚第三纪以来的深埋作用未曾改变其热演化程度,上段地层由于晚第三纪以来的沉积过补偿的深埋作用,对其在东营末期所达到的热演化程度进行了改造,明化镇组沉积时期达到最大古地温,开始二次生烃。由于早、晚第三纪古地温梯度差别不大,因此,过补偿厚度对下第三系烃源岩的地温演化起着十分重要的作用。随着过补偿厚度的增加,晚第三纪末古地温超过早第三纪末古地温的深度范围逐渐增大。下第三系烃源岩早第三系热演化程度的高低又影响其一次生烃残余有机质的含量高低,又决定了其二次生烃潜力。
The sedimentary thickness of Dongpu Depression since the Tertiary exceeded that of the end of Dongying, which is obviously compensated for sedimentation. It is decided that the thermal evolution characteristics of the Lower Tertiary source rocks are divided into two distinctly vertical sections: the lower strata are in Dongying At the end of sedimentation, the maximum paleo-geothermal temperature has been reached. The deep-buried effect since the Late Tertiary has not changed its thermal evolution. The upper strata, due to the deep-buried sedimentation overcompensation since the Late Tertiary, Degree of transformation, Minghua Zhen group deposition reached the maximum paleotemperature, began secondary hydrocarbon generation. Because of the difference between the early and late Tertiary paleogeothermal gradients, the over-compensation thickness plays an important role in the geothermal evolution of the Lower Tertiary source rocks. With the increase of overcompensation thickness, the depth of paleo-geothermal over the Late Tertiary over the temperature of Early Paleogene increased gradually. The level of thermal evolution of the Tertiary in the Lower Tertiary source rocks also affects the level of residual organic matter in the primary hydrocarbon generation and determines the potential for secondary hydrocarbon generation.