中文摘要：

沉积盆地的热历史是盆地的构造演化研究和油气资源评价及油气成藏的重要参数．本文利用磷灰石裂变径迹和镜质体反射率古温标模拟计算了济阳坳陷70口单井新生代以来的热演化历史，在此基础上分析了济阳坳陷内东营、沾化、惠民和车镇4个凹陷的地温梯度演化特征．研究结果表明，济阳坳陷新生代以来的古地温梯度是逐渐降低的，但在早第三纪时期下降的幅度较大，而在晚第三纪-第四纪则下降的幅度明显较小；济阳坳陷在孔店组沉积时期的地温梯度为54．0-50．0℃／km之间，沙河街沉积时期为50．0-40．0℃／km，东营组沉积时期为40.0—38.5℃／km。晚第三纪时期为38．5—35．5℃／km，第四纪以来基本未变．坳陷内4个凹陷的古地温梯度演化存在差异，特别是在早第三纪末期的东营构造运动以后，各凹陷的地温梯度演化差异更加明显．在晚第三纪时期，济阳坳陷各凹陷的地温梯度变化均较小，地温梯度的高低依次为东营凹陷、沾化凹陷、惠民凹陷和车镇凹陷．车镇凹陷的古地温梯度在整个新生代演化历史中均是济阳坳陷最低的．这种地温演化的差异与各凹陷的构造沉降演化史密切相关，同时地温演化差异也导致了各凹陷的烃源岩在生烃门限深度的差异．济阳坳陷的古地温梯度演化特征反映了济阳坳陷由断陷向坳陷的构造演化特征．

英文摘要：

The thermal history of the sedimentary basins is an important parameter for the study of tectonic evolution, hydrocarbon accumulation and hydrocarbon resource assessment. The thermal gradient evolution histories of 70 wells during the Cenozoic time in the Jiyang depression were modeled by using the vitrinite reflectance and apatite fission track data in this paper. Based on these modeling results, the characteristics of thermal evolution of the Dongying, Zhanhua, Huimin and Chezhen sags in the Jiyang depression were analyzed. The thermal gradients of the depression decreased during the Cenozoic time. However, it decreased quickly in Eogene, but only changed a little during the Neogene period. The thermal gradient was 54.0 - 50.0℃/km during the period of the Kongdian group deposition, 50.0 - 40.0℃/km during the period of Shahejie group, 40.0 - 38.5℃/km of Dongying group and 38.5 - 35.5℃/km during the Neogene. It changed little since then and decreased down to 35℃/km at the present-day. The four sags had different thermal evolution histories, especially after the Dongying tectonic movement at the end of Eogene. The thermal gradient of the Dongying sag is the highest, then the Zhanhua sag next, the Huimin sag is relatively lower and the Chezhen sag the lowest. The Chezhen sag underwent the lowest thermal history during the whole period of Cenozoic time. The subsidence histories of four sags controlled their thermal evolution. The differential thermal gradients resulted in the different threshold depth of hydrocarbon generation in the four sags. The modeling result of thermal history fits well with the evolution stages of rift-subsidence basin to down-warped basin by the tectonic subsidence analyses of the Jiyang depression.