Analysis by Weight and Volume

The traditional way to determine porosity and wet bulk density is based on weight and volume measurements of small sediment samples. Usually they are taken from the centre of a split core by a syringe which has the end cut off and a definite volume of e.g. 10 ml. While weighing can be done very accurately in shore-based laboratories mea- 

Together with the mass (m) of the wet sample equations 2.5 to 2.7 allow to compute the wet bulk density according to equation 2.2. 

Wet bulk density computations according to equation 2.3 require the knowledge of grain 

Porosities are finally computed from the volumes of the pore space and sample as defined by the equations above. 

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A direct method is the analysis by weight and volume, indirect methods are gamma ray attenuation and electrical resistivity measurements. 

Analysis by weight and volume primarily determines the wet bulk density, gamma ray attenuation the wet bulk density (by assumption of a processing porosity), and electrical resitivity the porosity. Porosity values can be converted to density values (and vice versa) by using equation 2.3. 

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