胜利油区东营凹陷热史分析──磷灰石裂变径迹证据

THERMAL HISTORY ANALYSIS OF DONGYING DEPRESSION,SHENGLI OIL REGION: EVIDENCE OFAPATITE FISSION TRACK

郭随平 施小斌 王良书 王捷 周光甲

Guo Sniping Shi Xiaobin Wang Liangshu Wang Jie Zhou Guangjia

磷灰石裂变径迹表明,东营凹陷形成后经历了一个持续的冷却热历史,在50～60Ma、20～30Ma之间经历了比较明显的冷却过程,其中20～30Ma之间的冷却是由东营组末期凹陷遭受抬升剥蚀所引起的,估算抬升剥蚀厚度为200余米。凹陷的磷灰石裂变径迹退火带深度范围为2000～3400m,与生油窗的深度有着很好的一致性;凹陷近期的快速埋藏增温使得退火带具有较高的温度范围。

The analysis of apatite fission tracks of 12 samples collected in Dongying Depressionindicates that the depression experienced a continuous cooling thermal history after its formation. Two distinct cooling processes took place during 50～60 Ma and 20～30 Ma respectly,and the cooling during 20～30Ma was resulted from the uplift and erosion of the depressionin the end of Dongying Formation,and the estimated thickness of the uplift and erosionamounts to more than 200 m. The depth of apatite fission tracks annealing zone ranges from 2 000 m to 3 400 m,which is well consistent with the depth of oil generation window.At thesame time,the rapid increase of recent temperature due to burial depth led to the high temperature range of the annealing zone.

10.11743/ogg19960106