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Genesis of solid bitumen.
1Lithospheric Organic Carbon (LOC) Group, Department of Geoscience, Aarhus University, Høegh-Guldbergs gade 2, 8000C, Aarhus, Denmark. Sanei@geo.au.dk.
Scientific Reports
|September 25, 2020
Summary
A new model outlines five stages of solid bitumen evolution during organic matter maturation. This research details solid bitumen formation and timing in source and reservoir rocks.
Area of Science:
- Geochemistry
- Petroleum Geology
Background:
- Solid bitumen formation is crucial for understanding hydrocarbon generation and migration.
- Existing models lack a comprehensive description of solid bitumen evolution across the entire maturation continuum.
Purpose of the Study:
- To propose a new schematic model for the generation and timing of multiple solid bitumen phases.
- To describe five distinct stages in the evolution of solid bitumen within source and tight reservoir rocks.
Main Methods:
- Development of a schematic model based on organic matter maturation.
- Analysis of solid bitumen evolution across different thermal maturity levels (Ro < 0.5% to Ro > 1.4%).
Main Results:
- Five stages of solid bitumen evolution are proposed: diagenetic, initial-oil, primary-oil, late-oil (solid-wax), and pyrobitumen.
- The model demonstrates the co-occurrence of multiple solid bitumen populations with oil and other hydrocarbon residues throughout maturation.
Conclusions:
- The proposed model provides a framework for understanding the complex evolution of solid bitumen.
- This research enhances the understanding of hydrocarbon phase behavior in source and reservoir rocks.
