东海西湖凹陷天外天二井热史恢复

Thermal history reconstruction of TWT-2 well in Xihu Depression,the East China Sea

应用结合法和流体包裹体显微测温法对东海西湖凹陷浙东中央背斜带南部天外天二井的地热演化史进行了模拟恢复。结果表明,自渐新世至今,总体表现为古地温梯度呈逐渐降低的趋势,高的古地温梯度有利于烃源岩的成熟演化与烃类生成;坳陷演化阶段的古热流高于区域沉降阶段,升温速率与古热流具有较为明显的"镜像"变化关系。利用结合法与流体包裹体测温法能有效地恢复含油气盆地的热演化历史。

Thermal history of TWT - 2 well in the central anticline belt in Xihu Depression is reconstructed using the methods of combination and fluid inclusion microthermometry. It is indicated that geothermal gradient decreased gradually from the Oligocene to present, and higher paleo-geothermal gradient is favorable for the maturation of source rock and hydrocarbon generation. The heat flow value during depression stage is higher than that during regional subsidence stage. The rate of geotemperature increase varied in contrast to the paleo-heat flow, and the thermal history of petroliferous basin can be reconstructed effectively using the methods of combination and fluid inclusion microthermometry.