Difference between revisions of "Pore system shapes"
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Revision as of 14:46, 30 July 2014
Exploring for Oil and Gas Traps | |
Series | Treatise in Petroleum Geology |
---|---|
Part | Predicting the occurrence of oil and gas traps |
Chapter | Predicting reservoir system quality and performance |
Author | Dan J. Hartmann, Edward A. Beaumont |
Link | Web page |
Store | AAPG Store |
Archie and non-Archie rocks
Choquette and Pray's[1] porosity types include two different groups of pore system shapes: petrophysically simple Archie porosity and petrophysically complex non-Archie porosity. In most cases, water saturation (Sw) of rocks with Archie porosity can be predicted from log analysis using the Archie equation
without modification. To predict water saturation in rocks with non-Archie porosity, we modify the Archie equation.
Table of characteristics
The table below describes pore system shapes and other important characteristics of Archie and non-Archie rocks.[2]
Feature | Archie | Non-Archie |
---|---|---|
Pore system shapes | Intergranular (found between rounded particles); interparticle | Mold-like
|
Intercrystalline (found between angular particles) | Vug-like
| |
Fracture-like
| ||
Relationship of pore shape to rock particles | Negative image of particles making up matrix | Relates only indirectly to particles making up matrix |
Pore connectivity | Pore throats connect pores into regular networks | Pores are irregularly distributed and can be either poorly or very well connected |
Porosity reduction processes | Grain coating or pore filling by calcite, silica, or dolomite | Pore or pore throat filling by clays or other minerals |
See also
- Pore system fundamentals
- Pore and pore throat sizes
- Connectivity and pore throat size
- Pore systems
- Capillary pressure (Pc) curves: pore throat size determination
References
- ↑ Choquette, P., W., Pray, L., C., 1970, Geologic nomenclature and classification of porosity in sedimentary carbonates: AAPG Bulletin, vol. 54, no. 2, p. 207–250. Classic reference for basic concepts regarding carbonate porosity.
- ↑ Coalson, E., B., Goolsby, S., M., Franklin, M., H., 1994, Subtle seals and fluid-flow barriers in carbonate rocks, in Dolson, J., C., Hendricks, M., L., Wescott, W., A., eds., Unconformity Related Hydrocarbons in Sedimentary Sequences: RMAG Guidebook for Petroleum Exploration and Exploitation in Clastic and Carbonate Sediments, p. 45–58.