Effective stress law for permeability of a mudstone sample
- Azar Hasanov (Center for Rock Abuse, Colorado School of Mines) | Manika Prasad (Center for Rock Abuse, Colorado School of Mines)
- Document ID
- Society of Exploration Geophysicists
- 2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Exploration Geophysicists
- Permeability, Petrophysics, Rock core laboratory measurements, Rock physics, Elastic
- 2 in the last 30 days
- 28 since 2007
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The effective stress coefficient determines the influence of confining and pore pressures on rock properties. We measured the permeability of the Lockatong mudstone sample as a function of pore and confining pressures. Using our established laboratory protocol for such measurements, we estimate the effective stress coefficient for permeability. We use an initial stress cycle to remove the effects of inelastic deformation and microfractures due to core damage. The permeability values lie between 1.8 μD (in the first stress cycle) and 100 nD. The effective stress coefficient for permeability is found to be greater than one (nk = 1.28) at the lowest differential stress. We observe a strong dependence of effective stress coefficient with differential pressure – effective stress coefficient decreased from 1.28 at 2.5 MPa to 0.65 at 60 MPa. The measured permeabilities obey a simple power law dependence on the calculated effective stress.
Presentation Date: Tuesday, October 16, 2018
Start Time: 8:30:00 AM
Location: 202A (Anaheim Convention Center)
Presentation Type: Oral
|File Size||722 KB||Number of Pages||5|
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