| 侏罗纪全球古海洋演变历程及其对西藏羌塘盆地油气勘探的启示 |
| |
| 关键词:Jurassic ancient ocean sea level ocean temperature carbon isotope oil and gas exploration Qiangtang Basin |
| 基金项目:国家自然科学基金项目(编号: 42172121) |
|
| 摘要点击次数: 73 |
| 全文下载次数: 37 |
| 摘要: |
| Historical Evolution of Jurassic Paleo-ocean as a Reference for Petroleum Exploration of the Qiangtang Basin in Tibetan Plateau |
| The Qiangtang Basin, located in the Tibetan Tethys domain of China, represents a significant target for pe-troleum exploration. Recent discoveries have revealed the presence of high-quality source rocks, charac-terized by oil shales and dolomite reservoirs within carbonate platform facies, in the Jurassic strata of this area. This paper aims to analyze the mechanism of organic matter enrichment and sedimentary models of carbonate platforms during the Jurassic period by drawing upon the latest advancements in global Ju-rassic paleo-oceanography and paleo-climatology research. The analysis is conducted from the perspective of global sea level fluctuations, changes in paleo-ocean temperatures, and positive and negative carbon isotope excursions. The objective is to provide valuable insights for predicting hydro-carbon-generating basins and delineating favorable exploration blocks within the Qiangtang Basin in the Tibetan plateau. The results demonstrate that the negative and positive carbon isotope excursions rec-orded in the organic matter of the Bilongco and Xichangliang oil shales in the Qiangtang Basin can be compared on a global scale. It is hypothesized that the Early and Late Jurassic periods were characterized by massive enrichment of organic matter in the Paleocean. These periods are considered target stratigraphies for the exploration of regionally distributed, high-quality hydrocarbon source rocks. The Middle Jurassic Buchu Formation and the Upper Jurassic Sowa Formation developed two sets of carbonate sedimentary strata, which were deposited during the global sea-level lowstand and highstand, respectively. These strata correspond to the “coolhouse” and “hothouse” climate system states, as indicated by the sea surface temperatures. It is suggested that cold-water carbonates and warm-water carbonate models should be uti-lized to predict reservoir distribution zones, respectively. |
| YI Haisheng.2025.Historical Evolution of Jurassic Paleo-ocean as a Reference for Petroleum Exploration of the Qiangtang Basin in Tibetan Plateau[J].Acta Geoscientica Sinica,46(3):623-636. |
| 查看全文 查看/发表评论 下载PDF阅读器 |