Abstract
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.
| Original language | English |
|---|---|
| Article number | 1786 |
| Journal | Scientific Reports |
| Volume | 10 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2020 |
Bibliographical note
Funding Information:The work was funded by the European Research Council under the European Union’s Seventh Framework Programme Grant agreement n° 308126 (LUSI LAB project, PI A. Mazzini). We acknowledge the support from the Research Council of Norway through its Centres of Excellence funding scheme, Project Number 223272 (CEED). The Authors would like to thank the management of Lapindo Brantas Indonesia for providing access to the subsurface data and for the authorisation to publish the results of this study. BPLS is thanked for their support during the field operations. Morgan T. Jones is also supported by the Research Council of Norway Unge Forskertalenter project ‘Ashlantic’, project number 263000. Tamsin Mather (University of Oxford) and Monika Weiß (BGR) are thanked for their help and assistance.
Publisher Copyright:
© 2020, The Author(s).
Funding
The work was funded by the European Research Council under the European Union’s Seventh Framework Programme Grant agreement n° 308126 (LUSI LAB project, PI A. Mazzini). We acknowledge the support from the Research Council of Norway through its Centres of Excellence funding scheme, Project Number 223272 (CEED). The Authors would like to thank the management of Lapindo Brantas Indonesia for providing access to the subsurface data and for the authorisation to publish the results of this study. BPLS is thanked for their support during the field operations. Morgan T. Jones is also supported by the Research Council of Norway Unge Forskertalenter project ‘Ashlantic’, project number 263000. Tamsin Mather (University of Oxford) and Monika Weiß (BGR) are thanked for their help and assistance.