The Michigan Geological Repository for Research and Education at Western Michigan University has an extensive collection of thin sections from across the state and in many formations.
Thin sections are very thin slivers of rock (about 30 μm thick) cut from cores. When examined with a polarizing microscope, these samples reveal the mineral composition and fabric of the rocks. That data is used to evaluate reservoir quality, environment of deposition and to compare these direct observations to porosity and permeability measurements obtained indirectly, such as by wireline logs. The MGRRE thin section collection documents over 6000 thin sections available for on-site viewing. We have scanned over 3000 thin sections which can be viewed in ScholarWorks. Click on the link in the Thin Section collection spreadsheet or on the ScholarWorks page to view the scanned image and the metadata.