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Monthly Meeting - Special Date for December - "Using Petrographic Analyses for Formation Damage Evaluation” presented by Christy Gresham

The Shreveport Petroleum Club, 15th floor
Cost: $20, Children 10 and under $8

We encourage members to invite guests, spouses, and friends to any of our meetings.

If you’d like a seat, kindly email or call in your reservation by the preceding Friday to John Stroud at or 318-425-0101.


Christy Gresham

Christy Gresham was born in Natchez, Mississippi. She grew up in Sibley, Mississippi surrounded by the country side noted for its sandy creek beds. Summers were usually spent hiking the cliffs and gullies and searching for rocks. Fate wasn’t sealed until her first Geology 105 class at University of Louisiana at Lafayette. Christy has a B.S. in geology (2006) and a M.S. in petroleum geology (2009), both from the University of Louisiana at Lafayette. She currently works for Core Laboratories and has 9 years of petrographic experience in analyzing the fabric, texture, composition, and porosity in U.S. and internationally-located sandstones, shales, and carbonates. ...


Most sandstone reservoirs, conventional and unconventional, contain authigenic clays that may be sensitive to various selected injectable fluids. Clays are important contributors in the reduction of permeability in sandstones due to their pore-filling and grain-coating properties. Further reduction in flow capacity can occur if sensitive clays within the reservoir chemically or mechanically interact with improperly-selected injection fluids which may dislodge unstable, clay particles resulting in pore throat blockage. This is known as formation damage due to the fluid/rock interaction within the reservoir.

Petrographic analyses can identify and quantify mineralogical, diagenetic, and depositional features in conventional, percussion, and rotary sidewall core sandstone samples. Petrographic analyses consist of X-ray diffraction (XRD), thin section, and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDX). XRD analysis provides mineralogical abundances and compositions of both bulk and clay minerals. Thin section analysis can depict the texture and fabric of selected sample as well as the location of minerals, pore distributions and sizes, and various clay morphologies (i.e. ‘structural’ or matrix components, argillaceous rock fragments, and authigenic, porefilling clays). SEM reveals higher magnification images pertaining to the location, distribution, and identification of micron-size, authigenic clays, and EDX indicates mineral chemistry. ...

Paid members of the Shreveport Geological Society can read the speaker's full abstract and biography in the newsletter by logging into the Members Area.