The Role of Moldic Porosity in Paleozoic Kansas Reservoirs and the Association of Original Depositional Facies and Early Diagenesis With Reservoir Properties

Kansas Geological Survey Open-file Report 2003-32

Arbuckle Core Characteristics

• Relative lack of karst associated fracture, breccia, and dissolution porosity in most cores - especially surprising considering that the cores came from flanks or tops of structural highs where karst processes would likely have been most extensive
• Dominance of matrix porosity (intercrystalline, moldic, fenestral, vuggy) related to depositional facies, early diagenesis, and dolomitization

Lithofacies

Major facies include:

1. Clotted algal boundstone
2. a) laminated muddy algal boundstone, b) laminated grainy algal boundstone
3. peloidal packstone-grainstone
4. packstone-grainstone
5. ooid packstone-grainstone
6. mudstone
7. wackestone
8. intraclastic conglomerate and breccia
9. cave fill shale and depositional shale
10. chert

In the cores studied the first seven lithologies account for more than 85% of the cored intervals.

Click on Facies to bring up more detail

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Last updated June 2003
http://www.kgs.ku.edu/PRS/publication/2003/ofr2003-32/P3-04.html