摘要
运用镜质体反射率(R.)和磷灰石裂变径迹(AFT)两种古温标,对苏北盆地高邮坳陷进行了古地温梯度反演.结果表明,该区平均古地温梯度为40.8～41.3℃/km,高于现今平均地温梯度.同时利用磷灰石裂变径迹动力学模型进行了热演化史的正演模拟,高邮凹陷K2t时期至E2s2时期平均古地温梯度近于41.0℃/km;之后随着构造沉降的停顿,平均地温梯度逐渐降低,Ny期至今地温梯度近于29.0℃/km.模拟结果为该区生排烃史及油气成藏史研究奠定了基础.
The vitrinite reflectance (R_o) and apatite fission track (AFT) data are used to regress for the geothermal gradient of Gaoyou Sag in Subei Basin. The result shows that average geothermal gradient of this area is 40.8~41.3℃/km, which is higher than that of nowadays. The forward simulation of geothermal history is made by apatite fission track dynamic model. Study shows that average geothermal gradient is about 41.0℃/km during K_2t (83Ma)-E_2s_2 (42Ma), then it decreases gradually with the tectonic subsidence halt, and approximate to 29.0℃/km during Ny (24.6Ma) of nowadays (0 Ma). The simulation result provides a foundation for studying the hydrocarbon accumulation, expulsion and accumulation history.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2005年第1期17-18,共2页
Journal of Oil and Gas Technology
关键词
古地温
地热史
镜质体反射率
磷灰石
裂变径迹
高邮凹陷
palaeogeothermal
geothermal history
vitrinite reflectance
apatite fission track
Gaoyou Sag
