济阳坳陷新生代地温场特征研究

Study of characteristics of the Cenozoic geotemperature field in Jiyang Depression

韩立国 柳忠泉 徐佑德 许世红 任凤楼 周丽

Han Liguo Liu Zhongquan Xu Youde Xu Shihong Ren Fenglou Zhou Li

中国石油化工股份有限公司胜利油田分公司地质科学研究院, 山东东营 257015

Geological Science Research Institute of SINOPEC Shengli Oilfield Company, Dongying 257015

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。

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 re-duced 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 oc-cured 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.

中国石化科技攻关成果(P03007)