Observations of reservoir quality alteration in proximity to igneous intrusions for two distinct sandstones in Scotland

Igneous intrusions are common features within rifted sedimentary basins. With advances in technology, exploration has progressed into more complicated petroleum systems where sediments segmented and altered by networks of dykes sills. Magmatism increases temperatures fluid pressures adjacent host rocks. This can lead to mobilisation mineral-rich hot fluids through pores fractures, which alters the rock microstructure via both mineralisation dissolution. However, few studies have quantified impact on reservoir quality, specifically pore their ability conduct fluid. study uses a combination plug porosity permeability, optical, SEM cathodoluminescence microscopy XRD investigate mineralogical quality changes sandstones thermal aureoles. In contrast published models, associating igneous bodies with reduction rock, our analyses two intruded show that alteration filling minerals clays also result enhancement permeability at intrusion-host contact. identifies microstructural chemical produce these characteristics discusses implications processes migration intrusion-rich