| 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 |
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| 引用本文：伊海生.2025.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[J].地球学报,46(3):623-636. |
| DOI：10.3975/cagsb.2024.111301 |
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| 基金项目:国家自然科学基金项目(编号: 42172121) |
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| 中文摘要:羌塘盆地是我国西藏特提斯域内重要的油气勘探目标, 目前在这一地区侏罗纪地层发现以油页岩为标志的优质烃源岩和碳酸盐岩台地相白云岩储油层。本文根据全球侏罗纪古海洋和古气候研究的最新进展, 试图从全球海平面波动、古海洋温度变化以及碳同位素正负向偏移的角度, 解析侏罗纪时期有机质富集的机制和碳酸盐岩台地沉积模式, 目的是为羌塘盆地生烃凹陷的预测和圈定有利勘探区块提供参考。研究结果表明: 羌塘盆地毕洛错油页岩和西长梁油页岩记录的有机质碳同位素负向和正向异常漂移可以进行全球对比, 早侏罗世和晚侏罗世应该是古海洋有机质富集的主要时期, 也是寻找区域分布的优质烃源岩的层位。中侏罗统统布曲组和上侏罗统索瓦组发育的两套碳酸盐岩沉积地层, 分别出现在全球海平面变化的低水位期和高水位期, 对应海表温度指示的凉室气候期和暖室气候期, 应该分别采用冷水和暖水碳酸盐岩沉积模式进行储层分布相带进行预测。 |
| 中文关键词:侏罗纪 古海洋 海平面 海洋温度 碳同位素 油气勘探 羌塘盆地 |
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| Historical Evolution of Jurassic Paleo-ocean as a Reference for Petroleum Exploration of the Qiangtang Basin in Tibetan Plateau |
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| Abstract: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. |
| keywords:Jurassic ancient ocean sea level ocean temperature carbon isotope oil and gas exploration Qiangtang Basin |
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