Changes

===Total porosity===

===Total porosity===

''Total porosity'' includes all void space regardless of whether the pores are interconnected or isolated. There is no practical ''way'' in the laboratory to measure isolated pore volume routinely on rocks. However, it can be determined by disaggregating the samples. If the disaggregated rocks contain smectite, the technique used to dry the samples can affect porosity values and the oven-dried total porosity will be larger than the humidity-dried total porosity (see Effective porosity below). Total porosity from a density log would equate with the disaggregated oven-dried total porosity from [[Overview of routine core analysis|cores]]. The [[Basic open hole tools#Compensated neutron|neutron log]], however, would enlarge the definition to include structural hydroxyl chemistry.

''Total porosity'' includes all void space regardless of whether the pores are interconnected or isolated. There is no practical ''way'' in the laboratory to measure isolated pore volume routinely on rocks. However, it can be determined by disaggregating the samples. If the disaggregated rocks contain smectite, the technique used to dry the samples can affect porosity values and the oven-dried total porosity will be larger than the humidity-dried total porosity (see Effective porosity below). Total porosity from a [[density log]] would equate with the disaggregated oven-dried total porosity from [[Overview of routine core analysis|cores]]. The [[Basic open hole tools#Compensated neutron|neutron log]], however, would enlarge the definition to include structural hydroxyl chemistry.

===Effective porosity===

===Effective porosity===