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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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Example of an automatic contact angle measurement. (a) Raw image of a weakly water-wet sub-volume containing a single trapped oil ganglion with oil, brine and rock in black, dark grey and light grey respectively. (b) Segmented image with oil, brine and rock in red, blue and white respectively. (c) Three-dimensional image of generated smoothed surfaces by the automated algorithm, showing the trapped oil ganglion in red and surrounding brine in blue with a selected measured point at the white dot. (d) Three-phase contact line with the same point highlighted by the grey circle. (e) Magnified view of the three-phase contact line highlighted in (d) showing vectors to the interfaces, and a magnified view of the measured contact angle example of 64°. (f) The same measurement is superimposed on the filtered image at the same location.