东濮凹陷新生代构造-热历史研究

发布时间：2018-07-03 20:29

  本文选题：东濮凹陷 + 热历史　； 参考：《地学前缘》2017年03期

【摘要】：东濮凹陷位于渤海湾盆地南缘,是中国典型的既富石油又富天然气的凹陷之一。文中通过镜质体反射率恢复了9个构造单元31口典型井的新生代热历史。研究结果表明:东濮凹陷各构造单元的新生代热历史总的趋势是一致的,并表现为"马鞍型"特征,分别在沙三段沉积时期和东营组沉积中晚期达到地温梯度高峰,其地温梯度分别为45~48℃/km和39~40℃/km,两期地温梯度高峰揭示了东濮凹陷经历了沙三段沉积时期和东营组沉积中晚期强烈的裂陷运动;新近纪开始,凹陷进入热沉降阶段,地温梯度逐渐下降至现今的31~34℃/km。此外,研究成果还揭示了东濮凹陷烃源岩热演化受东营组沉积时期的古地温场控制。文中的研究成果可以为东濮凹陷深层油气资源评价提供地热基础。
[Abstract]:Dongpu depression is located in the southern margin of Bohai Bay basin and is one of the typical oil and gas rich depressions in China. The Cenozoic thermal history of 31 typical wells in 9 tectonic units has been restored by vitrinite reflectance. The results show that the general trend of the Cenozoic thermal history of each tectonic unit in Dongpu depression is consistent, and it shows the characteristics of "Ma'an type", reaching the peak of geothermal gradient in the middle and late sedimentary periods of the third member of the Shahejie formation and the late stage of the Dongying formation, respectively. The geothermal gradient of Dongpu sag is 45 ~ 48 鈩，

本文编号：2094913