Majority of mineralogical studies directed at hydrocarbon producing formations are conventional studies that treat the formation as a bulk entity. Focusing on pore surface mineralogy, which is the identification of the elemental composition of the pore surface, seems to be a more realistic approach, since fluids in the formation come into direct contact with these elements on the surface. Rock-fluid properties such as relative permeability, wettability, capillary pressure and certain rock properties, are influenced by pore surface mineralogy. Hence, characterization of pore surface mineralogy will enhance understanding of the interaction between fluid and the porous medium.

This paper discusses Multiple Voltage Scanning Electron Microscopy as a novel method for characterization of pore surface mineralogy. Multiple Voltage Scanning Electron Microscopy, a new method that has successfully been used to study the surface of particles, has been implemented to identify the elemental composition of pore surface.

Results of the investigations of pore surface mineralogy for a reservoir in West Virginia is presented. This reservoir has experienced high injection pressures during a waterflooding project. The concentration of clays on the pore surface can be a possible explanation for high injection pressure.

This paper will try to direct the attention of scientists and researchers to this issue and emphasize the importance of pore surface mineralogy and its effects on rock-fluid properties.

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