Wpływ mikrotekstury i procesu kwasowania skały na jej parametry zbiornikowe: studium przypadku piaskowców krośnieńskich z rejonu Dwernika, Bieszczady
Abstract
The influence of rock microtexture and acidizing on reservoir properties: a case study of the Krosno Sandstones from Dwernik, Bieszczady Mts.
A b s t r a c t. The paper briefly describes 3D variability of reservoir properties, such as porosity and permeability at a micro-scale in reference to the directionality of rock microtexture and the occurrence of a deformation band. The study was conducted on the sample of the coarse-grained Krosno Sandstones with a deformation band after treatment with hydrochloric acid. Spot measurements of permeability using a portable air minipermeameter and porosity using X-ray computed microtomography were made. The local porosity within the sample ranges from 1.38 to 2.70 %, whereas the permeability varies from 7.5 to 14.5 mD. The anisotropy of permeability within the sample is related to the orientation of pores. The highest permeability values are observed in the direction parallel to the largest elongation of pores. The deformation band shows higher permeability values in comparison to the undeformed part of the sample.
A b s t r a c t. The paper briefly describes 3D variability of reservoir properties, such as porosity and permeability at a micro-scale in reference to the directionality of rock microtexture and the occurrence of a deformation band. The study was conducted on the sample of the coarse-grained Krosno Sandstones with a deformation band after treatment with hydrochloric acid. Spot measurements of permeability using a portable air minipermeameter and porosity using X-ray computed microtomography were made. The local porosity within the sample ranges from 1.38 to 2.70 %, whereas the permeability varies from 7.5 to 14.5 mD. The anisotropy of permeability within the sample is related to the orientation of pores. The highest permeability values are observed in the direction parallel to the largest elongation of pores. The deformation band shows higher permeability values in comparison to the undeformed part of the sample.