| 羌塘盆地中侏罗统布曲组包裹体特征及油气成藏期次研究 |
| 点此下载全文 |
| 引用本文：张莉莉,赵珍,杨易卓,王茜.2025.羌塘盆地中侏罗统布曲组包裹体特征及油气成藏期次研究[J].地球学报,46(3):683-693. |
| DOI：10.3975/cagsb.2024.092501 |
| 摘要点击次数: 39 |
| 全文下载次数: 17 |
|
| 基金项目:中国地质科学院基本科研业务费项目“羌塘盆地重点地区选区评价研究”(编号: JKY202301)和中国地质调查三级项目“羌塘盆地阿木错凹陷油气地质调查”(编号: DD20221855) |
|
| 中文摘要:羌塘盆地不同构造位置的布曲组(J2b)碳酸盐岩储层油气成藏期次尚不明确。本文以南羌塘毕洛错地区和北羌塘胜利河地区的布曲组储层为研究对象, 开展了流体包裹体岩相学、显微测温及测盐等工作, 结合埋藏史, 确定油气充注过程及成藏期次。结果表明, 毕洛错地区在埋藏期经历了3期烃类充注, 第Ⅰ期在晚侏罗世—早白垩世, 为大量油充注期; 第Ⅱ期在晚白垩世, 为油气充注期; 第Ⅲ期充注发生在古近纪早期, 为大量天然气充注。胜利河地区在埋藏期也经历了3期烃类充注, 第Ⅰ期发生在早白垩世, 为大量油及少量天然气充注; 第Ⅱ期发生在晚古新世—早始新世, 以油气充注为主; 第Ⅲ期充注在晚始新世, 为大量天然气充注。南、北羌塘布曲组均发育部分均一温度较高的包裹体, 可能与逆冲推覆构造和岩浆热液活动有关, 在新生代发育第二次成藏。整体而言, 南羌塘油气成藏期普遍早于北羌塘。 |
| 中文关键词:羌塘盆地 布曲组 流体包裹体 逆冲 成藏期次 |
| |
| Fluid Inclusion Characteristics and the Hydrocarbon Accumulation Stages of the Middle Jurassic Buqu Formation in the Qiangtang Basin |
|
|
| Abstract:The hydrocarbon accumulation stages of the Buqu carbonate reservoirs (J2b) in different tectonic units in the Qiangtang Basin remains unclear. In this study, the carbonate reservoirs of the Buqu Formation in the Biluo Co area, Southern Qiangtang, and in the Shengli River area, Northern Qiangtang, were taken as re-search objects, and petrography, microthermometry, and salt measurements of the fluid inclusions were performed. The results showed that the Biluo Co area experienced three stages of hydrocarbon charging during the burial period. The first stage occurred during the Late Jurassic–Early Cretaceous and was a high oil charging period. The second stage occurred during the Late Cretaceous and was the oil and gas charging period. The third stage occurred in the Early Paleogene, with a large amount of natural gas charging. The Shengli River area also experienced three hydrocarbon charging stages during its burial period. The first stage occurred during the Early Cretaceous and included a large amount of oil and a minor amount of natural gas filling. The second stage occurred in the Late Paleocene–Early Eocene and was dominated by oil and gas filling. The third stage of accumulation occurred in the Late Eocene, and the reservoir was filled with a large amount of natural gas. The Buqu Formation in both southern and northern Qiangtang developed some fluid inclusions with relatively high homogenization temperatures, which may be related to the thrust faults and magmatic hydrothermal activities. The second accumulation occurred during the Cenozoic. In general, the hydrocarbon accumulation period in Southern Qiangtang occurred earlier than that in Northern Qiangtang. |
| keywords:Qiangtang Basin Buqu Formation fluid inclusion thrust faults hydrocarbon accumulation stages |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|
