Pore Geometry is the configuration of the pore spaces within a rock (limestone) or between the grain constituents of a rock (sandstone or shale. It is determined by the framework components in limestones and by the packing of grains in sandstones. In both cases, sorting of the grains or framework organisms will dictate the pore geometry. If there are finer sand grains or silts that clog the pore spaces of the rock, then that alters the pore geometry. If there is significant compaction of the grains or framework organisms, then that affects the pore geometry. If there are significant differences in grain or framework cementation, then that affects the pore geometry. Porosity and Permeability often have a linear relationship with increasing porosity meaning increasing permeability. The linearity of the relationship is affected by the pore geometry. Low porosity carbonates (limestone and dolomite) tend to have better permeability at low porosity, than do higher porosity sandstones for thi