Zaputlyaeva Alexandra, Mazzini Adriano, Blumenberg Martin, Scheeder Georg, Kürschner Wolfram Michael, Kus Jolanta, Jones Morgan Thomas, Frieling Joost
Centre for Earth Evolution and Dynamics (CEED), University of Oslo, Oslo, Norway.
Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany.
Sci Rep. 2020 Feb 4;10(1):1786. doi: 10.1038/s41598-020-58567-6.
Conventional studies of petroleum basins associate oil generation with the gradual burial of organic-rich sediments. These classical models rely on the interplay between pressure, temperature, and the time required for organic matter transformation to oil and gas. These processes usually occur over geological timescales, but may be accelerated by rapid reactions when carbon-rich sediments are exposed to migrating magmatic fluids. The spectacular Lusi eruption (north-east Java, Indonesia) is the surface expression of the present-day deep interaction between volcanic and sedimentary domains. Here we report the ongoing generation of large amounts of hydrocarbons induced by a recent magmatic intrusion from the neighbouring Arjuno-Welirang volcanic complex. We have investigated a unique suite of oil and clast samples, and developed a detailed conceptual model for the complex hydrocarbon migration history in this part of the basin by integrating multidisciplinary techniques. Our results show that palynology, organic petrology, and chlorite microthermometry are the most sensitive geothermometers for basins affected by recent magmatic activity. These findings further our understanding of the driving mechanisms fueling the world's largest active mud eruption and provide a unique dataset to investigate modern hydrocarbon generation processes.
对石油盆地的传统研究将石油生成与富含有机质沉积物的逐渐埋藏联系起来。这些经典模型依赖于压力、温度以及有机物质转化为石油和天然气所需时间之间的相互作用。这些过程通常发生在地质时间尺度上，但当富碳沉积物暴露于迁移的岩浆流体时，快速反应可能会加速这些过程。壮观的卢西火山喷发（印度尼西亚爪哇东北部）是当今火山与沉积区域深部相互作用的地表表现。在此，我们报告了由邻近的阿朱诺 - 韦利朗火山复合体近期岩浆侵入引发的大量碳氢化合物正在生成的情况。我们研究了一套独特的石油和碎屑样本，并通过整合多学科技术，为该盆地这一区域复杂的碳氢化合物运移历史建立了详细的概念模型。我们的结果表明，孢粉学、有机岩石学和绿泥石显微测温法是受近期岩浆活动影响的盆地中最灵敏的地温计。这些发现进一步加深了我们对引发世界上最大规模活性泥火山喷发的驱动机制的理解，并为研究现代碳氢化合物生成过程提供了一个独特的数据集。
