济阳坳陷新生代热演化特征研究

本文综合应用镜质组反射率法和磷灰石裂变径迹法恢复了济阳坳陷新生代地温演化历史，结果表明济阳坳陷古地温梯度在新生代是逐渐降低的,其中古近纪比新近纪下降的幅度大；同时济阳坳陷内各凹陷的古地温梯度演化也存在差异，特别是古近纪末期的东营构造运动后，各凹陷的地温梯度演化差异更加明显；根据各凹陷的古热场恢复，新近纪以来东营凹陷的古地温最高，其次是沾化凹陷，惠民凹陷和车镇凹陷的古地温较低；烃源岩的生烃演化历史与其经历的古热场密切相关，古地温梯度越高的地区，烃源岩进入生烃门限的深度就越浅、时间越早。

Cenozoic Geothermal Evolution in the Jiyang Depression

This paper reconstructed geothermal history of the Jiyang depression using apatite fission track and vitrinite reflectance model. The result indicates that in the Cenozoic, geothermal gradient in the Jiyang depression decreased gradually, with a high magnitude of decreasing in the Eogene than that in the Neogene. Meanwhile, there existed distinct differences of geothermal evolution between each sags at the Jiyang depression and the difference between sags was more obvious especially after the Dongying movement at the late of the Eogene. Based on restoration of the geothermal evolution of each sag, the Dongying sag had a highest geothermal temperature, followed by the Zhanhua sag, Huimin sag and Chezhen sag. The evolution of source rocks was closely related to ancient geothermal field. The higher geothermal gradient was, the shallower the depth of source rocks was, and the earlier the time was.