Porosity-Measurement Comparisons by Five Laboratories
- B.J. Dotson (Magnolia Petroleum Co.) | R.L. Slobod (The Atlantic Refining Co.) | P.N. McCreery (Phillips Petroleum Co.) | James W. Spurlock (Stanolind Oil and Gas Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- December 1951
- Document Type
- Journal Paper
- 341 - 346
- 1951. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
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A core sample porosity-check program is described. A number of laboratoriesparticipated in the investigation, which comprised measuring the porosities often selected natural and synthetic core samples. Each laboratory employed itsown method (or methods) of measurement. These included Boyle's Law,water-saturation, and organic liquid-saturation methods. Brief descriptions ofeach method employed are given. In general, the measured values of porositywere in reasonably good agreement. The average deviation of porosity from themean or average values for the group of samples was ?0.5 porosity per cent. Theresults of these measurements are compiled and presented in graphical form.
The total bulk volume of a porous sample is derived from the sum of twovolumes, the void or pore volume and the solid or grain volume. The porosityfraction of the sample is defined as the ratio of the void volume to the bulkvolume. Multiplication of this ratio by 100 converts it to per centporosity.
Distinction is made here between total porosity and effective porosity. Theformer includes all void space, both interconnected and isolated, while thelatter includes only those voids which are interconnected. This investigationdeals only with the effective porosity.
Numerous cases had been noticed in which there appeared to be appreciablediscrepancies in the results of porosity determinations on core samples.Differences of as much as 10 to 15 porosity per cent had been reported fromdifferent sources for the same sample.
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