摘要
盆地热演化直接控制了盆内烃源岩的演化及后期油气的生成、赋存状态及分布规律。本文以横跨苏北盆地的两条地震剖面g1和露为例，采用构造热演化模拟的方法，对苏北盆地晚白垩世伸展拉张以来的热历史进行了恢复，并分阶段进行了讨论，认为晚白垩世以来的第一次伸展（95～83Ma）期间，苏北盆地不同的构造单元（凹陷和凸起）基底热流值较小，且基本一致。第二期伸展时（83～54．9Ma），基底热流值开始逐渐增大，且不同构造单元间热流值开始出现差异变化。第三期伸展时（54．9～38Ma），较前一期热流值增幅更大，多个部位达到了本次模拟时热流的最大值，且不同的构造单元间热流值增幅差异极为明显。而到了新近纪，由于发生了轻微的构造反转，苏北盆地热流值基本趋于稳定。
Basin thermal evolution is an immediate dominant factor for controlling source rock evolution and gas production. Two seismic profiles, gl and g2, across the Subei Basin were studied with tectonic-thermal evolution modeling. With the aim to reconstruct the extension of the Subei Basin after Cretaceous, the thermal history was divided into three extension stages. During the first extension stage （95-83 Ma）, the basement heat flows from different tectonic units in the Subei Basin were low and uniform. For the second stage （83-54.9 Ma）, the basement heat flow values increased gradually, and the values started to vary between the different tectonic units. In the last stage （54.9-38 Ma）, the basement heat flows increased apparently, and many heat flows reached the maximum value in this modeling, while different tectonic units revealed large differences. After the Neogene, these heat flow values of the Subei Basin were stable due to the slight tectonic inversion.
出处
《高校地质学报》
CAS
CSCD
北大核心
2013年第4期574-579,共6页
Geological Journal of China Universities
基金
国家自然科学基金项目(40621063)
国家科技重大专项项目(2011ZX05005-003)联合资助
关键词
苏北盆地
构造热演化
构造热模拟
古温标
Subei Basin
tectonic-thermal evolution
paleo-thermal indicator
tectonic-thermal modeling
