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Molecular Signatures of Solvent Injection in Shale Organic Nanopores


 In this study, we investigate the mixing process of an organic solvent with reservoir fluids in organic nanopores. Using molecular dynamics (MD) simulations, we create a molecular model of mature kerogen saturated with a black oil and systematically investigate the physical mechanisms by which the mixing process occurs. The in-situ hydrocarbon mixture in organic pores partitions because of preferential adsorption of the longer alkane chains and aromatic molecules onto the pore surface and differential mixing with the solvent. Under primary production, the produced oil composition is always lighter than the in-situ fluid. Injection of a solvent promotes mobilization of intermediate and heavy components demonstrating the promise of miscible enhanced oil recovery (EOR) in shales. We also show that solvent penetration is rather limited even with extended periods of soaking which highlights the importance of surface area to the success of EOR.