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. 2017 Sep 7;7:10753. doi: 10.1038/s41598-017-10992-w

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Automatic in situ contact angle measurement workflow demonstrated on oil ganglia in Sample 1 with a magnified view of a single trapped oil ganglion highlighted in the black circle. Rock and brine were rendered transparent. (a,b) Extracted oil-brine surface (green) and oil-rock surface (red). (c,d) Smoothed surfaces with a selected example point indicated by the white dot. (e,f) Three-phase contact line with oil-brine surface (green), oil-rock surface (red) and brine-rock surface (blue) with the same selected example point highlighted by the back circle. (g) Contact angle measurement of 52° at the selected point from the vector dot product of the oil-brine interface and rock interface vectors.