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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Characteristics of residual oil distribution in different regions in the microscopic etching model. (a1–a4) Saturated oil; (b1–b4) Water flooding; (c1–c4) P. aeruginosa flooding; (d1–d4) B. subtilis flooding; (e1–e4) Co-culture of P and B.