spreading of oil on grains of oil reservoir rock at reservoir conditions (high pressure and high temperature) is undesirable phenomena, petroleum engineers try to free oil from frocks surface and alter rocks wettability to be water wet rather than oil wet, but before that we need to understand relation between rocks wettability and rocks mineralogy.
Well,
Factors affecting wettability: Rock and water interaction Rock
composition carbonates are basic
Silicates are acidic
Different minerals have different basic/acidic properties
Water
Presence of water inhibits oil wetting ability
Salinity
Composition
pH
Article Modeling the Hydrogeochemical Processes and Source of Ions i...
http://www.searchanddiscovery.com/documents/2015/51111hill/ndx_hill.pdf
Regards
Definitely rock surface wettability related to rock mineralogy.
primarily the nature of rock like igneous/ metamorphic and sedimentary
and in detail the nature alteration/ deformation and mineral assemblage will determine the rock properties.
Presence of clay minerals/ lime bearing minerals will drastically the wettability of the rock.
Detailed petro-mineralogical studies is a must to understand the hydrological/ geotechnical properties of any rock.
Well, Anna Sophia Knox
What is the activity of water within the pores when replaced oil?
Regards
Yes mineralogy plays a role in wettability. In general carbonate reservoirs become oil-wet whereas sandstone reservoirs have mixed wettability (some minerals tend to be water wet and others oil wet under the same conditions). If you look at a question posted here in Aug 8 2015 by Parisa POURHAJI (Why are carbonate reservoirs oil-wet?) you can find a wealth of discussion and links focussing minly on carbonate reservoirs.
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