摘要
基于化学动力学原理,采用镜质组反射率模拟计算法,对辽河盆地东部凹陷14口井的古地温演化进行了恢复,重建了各时期平均古地温柱。总结了古地温演化的总体特征,认为研究区古近纪古地温演化特点是Es3高,Es1-2低,Ed-N高,为波状高地温演化。区域上,凹陷内部呈南北高、中央低的趋势,南部黄金带、二界沟及北部牛居地区的地温梯度一般在35℃～40℃/km,而中段相对较低(29℃～35℃/km)。
The eastern sag is one of the three richhydrocarbon sags in Liaohe basin. Based on the chemical dynamic theory and digital simulation of vitrinite reflectances, the paleotemperatural evolutions of 14 wells in the eastern sag are shown, and then the geothermal gradient of every period during cenozoicera is reconstructed. That reveals the total characteristics of paleotemperatural evolution in the eastern sag. The geothermal evolution is flexuous since Tertiary, that is high paleotemperature in the early Shahejie, low in the middlelate Shahejie and high again in the Dongying stage to Neogene. To total region, the geothermal gradients (35℃～40℃) are higher in the southern and northern part than that (29℃～35℃/km) in the central part.
出处
《地质力学学报》
CSCD
2003年第2期106-112,共7页
Journal of Geomechanics
基金
中国地质调查局地质调查项目资助(编号:DKD2104011)
关键词
辽河盆地
东部凹陷
古地温演化
地温梯度
liaohe basin
eastern sag
paleotemperature
geothermal gradient
