Confinement Effect on Porosity and Permeability of Shales.

Abstract:

:Porosity and permeability are the key factors in assessing the hydrocarbon productivity of unconventional (shale) reservoirs, which are complex in nature due to their heterogeneous mineralogy and poorly connected nano- and micro-pore systems. Experimental efforts to measure these petrophysical properties posse many limitations, because they often take weeks to complete and are difficult to reproduce. Alternatively, numerical simulations can be conducted in digital rock 3D models reconstructed from image datasets acquired via e.g., nanoscale-resolution focused ion beam-scanning electron microscopy (FIB-SEM) nano-tomography. In this study, impact of reservoir confinement (stress) on porosity and permeability of shales was investigated using two digital rock 3D models, which represented nanoporous organic/mineral microstructure of the Marcellus Shale. Five stress scenarios were simulated for different depths (2,000-6,000 feet) within the production interval of a typical oil/gas reservoir within the Marcellus Shale play. Porosity and permeability of the pre- and post-compression digital rock 3D models were calculated and compared. A minimal effect of stress on porosity and permeability was observed in both 3D models. These results have direct implications in determining the oil-/gas-in-place and assessing the production potential of a shale reservoir under various stress conditions.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Goral J,Panja P,Deo M,Andrew M,Linden S,Schwarz JO,Wiegmann A

doi

10.1038/s41598-019-56885-y

subject

Has Abstract

pub_date

2020-01-08 00:00:00

pages

49

issue

1

issn

2045-2322

pii

10.1038/s41598-019-56885-y

journal_volume

10

pub_type

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