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Laboratory Measurements of Porosity and Permeability of Shale
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fifth EAGE Shale Workshop, May 2016, Volume 2016, p.1 - 5
Abstract
Summary
An extensive laboratory testing program and round robin test suggests that:-
- Good agreement can be obtained between laboratories in terms of grain density, bulk density and porosity as long as samples are cleaned in a similar way and helium pycnometry is used for grain density.
- It is not recommended making porosity measurements using nitrogen or methane due to gas adsoption.
- Stress corrections need to be applied for bulk density measurements due to the presence of induced-microfractures; Hg injection analysis may provide a cheap way of providing data to make suc6h stress corrections.
- The crushed shale method is not recommended for estimating permeability.
- Core plug permeability measurements are often overly influenced by damage (fractures) and it is recommended inverting results using a dual permeability model.
- Models incorporating transitional flow and Knudsen diffusion seem too complicated to be used to effectively invert the results from transient flow experiments. Instead, simple gas slippage models are recommended.
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