| 李 雷.东濮凹陷新生代的热历史[J].地质与勘探,2016,52(3):594-600 |
| 东濮凹陷新生代的热历史 |
| Cenozoic thermal history of the Dongpu sag, Bohai Bay basin |
| 投稿时间：2015-10-23 修订日期：2016-03-03 |
| DOI： |
| 中文关键词: 东濮凹陷 埋藏史 热史 烃源岩 地温梯度 |
| 英文关键词: Dongpu sag, thermal history, burial history, source rocks, geothermal gradient |
| 基金项目:国家十二五重大专项（2011XZ05006-004），深层油气资源潜力评价资助 |
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| 摘要点击次数: 2017 |
| 全文下载次数: 78 |
| 中文摘要: |
| 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。 |
| 英文摘要: |
| The Dongpu sag, located in the south of the Bohai Bay Basin, has a great potential for oil and gas exploration. This study is to reveal the burial history, thermal history and maturation evolution history of source rock in this area. The burial history and thermal history were modeled using vitrinite reflectance data from 18 wells of this sag. The modeling results show that the sag experienced one uplift and two depressions, and its thermal history is characterized by the “saddle-shape type”. The geothermal gradients increased gradually from the fourth member to the third member of the Shahejie Formation, reaching the maximum values (45.2-48℃/km) at the end of the third member epoch. Then the thermal gradient decreased gradually from the second member of Shahejie Formation to the present day, only increasing weakly at the late Dongying Formation, with thermal gradients 30-34℃/km in the present day. Meanwhile, based on the burial history and the thermal history above, combining the tectonic and organic geochemistry, the maturation evolution history was simulated. The results show the maturation evolution of source rocks is controlled by geothermal fields, of which 3 sets of source rocks culminated at the time of Dongying Formation (27Ma). |
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