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Updated: Jun 7, 2025
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Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications
Published on: January 16, 2018
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Solvent-pore interactions in the Eagle Ford shale formation
Victoria H DiStefano1,2, Joanna McFarlane1, Andrew G Stack1
1Oak Ridge National Laboratory, Oak Ridge, TN 37830-6110, USA.
Fuel (London, England)
|November 21, 2024
Summary
Solvent extraction of Eagle Ford Shale altered pore space. Kerogen swelling due to solvent interaction was the primary cause of porosity reduction in these organic-rich rock samples.
Area of Science:
- Geochemistry
- Petroleum Geology
- Materials Science
Background:
- The Eagle Ford Shale is a significant source of hydrocarbons.
- Understanding the impact of organic matter on rock properties is crucial for resource extraction.
- Solvent interactions with shale components can alter pore structure and permeability.
Purpose of the Study:
- To investigate the effects of various solvents on the pore space of Eagle Ford Shale.
- To quantify the amount and type of organic matter extracted.
- To correlate solvent-induced changes in porosity with specific solvent-kerogen interactions.
Main Methods:
- Solvent extraction using toluene, cyclohexane, methanol, dichloromethane, and hydrochloric acid.
- Analysis of extracted organic matter using Gas Chromatography-Mass Spectrometry (GC-MS).
- Porosity determination via (Ultra) Small Angle Neutron Scattering ((U)SANS).
Main Results:
- Solvents extracted alkanes and aromatics, with hydrochloric acid selectively extracting higher molecular weight alkanes.
- A general decrease in porosity was observed after solvent extraction.
- Kerogen swelling, driven by kerogen-solvent interactions, was identified as the dominant mechanism for porosity reduction.
Conclusions:
- Solvent extraction significantly impacts the pore structure of Eagle Ford Shale.
- Kerogen swelling is a key factor in porosity changes during solvent-rock interactions.
- The findings provide insights into the behavior of shale formations during hydrocarbon production and fluid injection processes.
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