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Solvent-pore interactions in the Eagle Ford shale formation.

Victoria H DiStefano1,2, Joanna McFarlane1, Andrew G Stack1

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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.

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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.