济阳坳陷新生代地温场特征研究

为了找出济阳坳陷内各凹陷成烃演化与古热场间的关系,综合应用镜质体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;烃源岩的生烃演化历史与其经历的古热场密切相关,古热场越高的地区,烃源岩进入生烃门限的深度就越浅、时间越早。

Study of characteristics of the Cenozoic geotemperature field in Jiyang Depression

Geothermal history of Jiyang Depression was reconstructed through synthesizing apatite fission track and vitrinite reflectance model offered in this paper.The study on the relation between four sags of Jiyang Depression and paleogeothermal results indicate the geotemperature gradient in Jiyang Depression reduced gadually,the geotemperature gradient reduced rapidly in the Eogene period and then it was slowly.There is difference in thermal evolution in these four sags,especially after Dongying movement which occured in late Eogene.The highest paleogeothermal field occurred in Dongying Sag,followed by Zhanhua Sag,Huimin Sag and Chezhen Sag.The evolution of source rocks is related tightly to paleogeothermal field.In high paleogeothermal field,source rocks entered oil threshold in shallower formation.