CAJ | 학술논문

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g2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（95~83 Ma）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（83~54.9 Ma），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（54.9~38 Ma），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。
분지열연화직접공제료분내경원암적연화급후기유기적생성、부존상태급분포규률。본문이횡과소북분지적량조지진부면g1화g2위례，채용구조열연화모의적방법，대소북분지만백성세신전랍장이래적열역사진행료회복，병분계단진행료토론，인위만백성세이래적제일차신전（95~83 Ma）기간，소북분지불동적구조단원（요함화철기）기저열류치교소，차기본일치。제이기신전시（83~54.9 Ma），기저열류치개시축점증대，차불동구조단원간열류치개시출현차이변화。제삼기신전시（54.9~38 Ma），교전일기열류치증폭경대，다개부위체도료본차모의시열류적최대치，차불동적구조단원간열류치증폭차이겁위명현。이도료신근기，유우발생료경미적구조반전，소북분지열류치기본추우은정。
Basin thermal evolution is an immediate dominant factor for controlling source rock evolution and gas production. Two seismic profiles, g1 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.