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A comparison of plug-derived, probe-derived and crushed-rock permeability in low-permeable shales: Examples from the Duvernay Shale, Alberta (Canada)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ghanizadeh, Amin Clarkson, Christopher Raymond |
| Copyright Year | 2014 |
| Abstract | Summary We compare different methods for determination of gas permeability in low-permeability Canadian shales. Furthermore, we analyze and discuss the effects of different controlling factors including porosity, TOC content, mineralogy, pore-fluid content and effective stress on permeability. For the samples analyzed under similar pore-fluid content, probe-derived permeabilities (3.8·10 -4 - 2.7·10 -2 mD) were consistently higher than pulse-decay-derived (8.4·10 -5 - 7.6·10 4 mD) and crushed-rock (3.7·10 -7 - 5.9·10 -6 mD) permeabilities. Corrected probe-derived permeabilities for Overburden (NOB) pressure (1.5·10 -5 - 5.6·10 -4 mD) were, however, comparable with the pulse-decay-derived and crushed-rock permeabilities. Crushed-rock permeabilities measured on cleaned samples (3.8·10 -5 - 1.1·10 -3 mD) were up to more than two orders of magnitude higher than those measured on uncleaned samples (4.3·10 -7 5.9·10 -6 mD). The gas permeability values measured for plugs and crushed-rock increased significantly with increasing porosity (2.5-6.6 %), ranging between 3.7·10 -7 and 1.1·10 -3 mD. For the samples analyzed, the dominant pore throat diameters for gas (He, N2) transport could be well estimated from porosity and permeability data using Winlandstyle correlations. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.geoconvention.com/archives/2014/168_GC2014_A_comparison_of_plug-derived_probe-derived_and_crushed-rock_permeability.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
