Changes in matrix thermal conductivity of clays and claystones as a function of compaction

摘要: Vertical matrix thermal conductivities of clays and claystones in onshore Denmark decrease with decreasing porosity, probably because increasing orientation highly anisotropic clay platelets during compaction. The relationship between vertical conductivity λ vm porosity for this dataset can be expressed as either =2.544exp(0.943 φ ) or =2.749exp (0.637 ), depending upon the statistical methods used to analyse data. Using first equation Danish is found about 4.9 W m −1 K porous sediments, 2.54 when reaches zero. second 4.3 2.75 at zero porosity. Anisotropy varies from an assumed value 1.02 2.44 using equation, 1.87 equation. These values agree well measured This phenomenon common universal fine-grained clay-rich method data analysis could applied most all claystone datasets. However, equations derived study will appropriate shales comparatively high quartz contents similar those samples analysed. Other specific relationships exist more-pure claystones.