东濮凹陷新生代热史研究

发布时间：2018-05-12 23:10

  本文选题：东濮凹陷 + 埋藏史　； 参考：《地质与勘探》2016年03期

【摘要】：东濮凹陷是渤海湾盆地南缘极具油气开采潜力的凹陷,本文揭示该凹陷新生代埋藏史、热史及烃源岩演化史。利用凹陷各构造单元18口井的镜质体反射率数据,恢复其埋藏史、热史。结果显示,东濮凹陷经历"一升两降"的构造沉降,并具有"马鞍型"的热演化特征。自沙四段沉积开始至沙三段,地温梯度逐渐增加,在沙三段沉积末期达到最大,为45.2℃~48℃/km。自沙二段沉积开始至今,地温梯度总体逐渐降低,仅在东营组沉积时期出现微弱回升,现今地温梯度为30℃~34℃/km。以埋藏史和热史为基础,结合构造及有机地球化学资料,对东濮凹陷18口井烃源岩演化史进行模拟。结果表明,烃源岩热演化受东营组沉积时期的古地温控制,3套烃源岩成熟度均在27Ma(东营组沉积时期)达到最大。
[Abstract]:Dongpu depression is a depression with great potential for oil and gas exploitation in the southern margin of Bohai Bay basin. This paper reveals the Cenozoic burial history, thermal history and source rock evolution history of the depression. Based on vitrinite reflectance data of 18 wells in each structural unit of depression, burial history and thermal history are restored. The results show that Dongpu sag experienced tectonic subsidence of "one liter and two drops" and has the characteristics of thermal evolution of "saddle type". The geothermal gradient increased gradually from the beginning of the deposition of the fourth member of the Shahejie formation to the third member of the formation, and reached the maximum at the end of the third member of the formation, which was 45.2 鈩，

本文编号：1880551