<P> The next step is to use information from appraisal wells to estimate the porosity of the rock . The porosity , or the percentage of the total volume that contains fluids rather than solid rock , is 20 - 35 % or less . It can give information on the actual capacity . Laboratory testing can determine the characteristics of the reservoir fluids , particularly the expansion factor of the oil , or how much the oil expands when brought from high pressure , high temperature of the reservoir to `` stock tank '' at the surface . </P>
<P> The next step is to use information from appraisal wells to estimate the porosity of the rock . The porosity , or the percentage of the total volume that contains fluids rather than solid rock , is 20 - 35 % or less . It can give information on the actual capacity . Laboratory testing can determine the characteristics of the reservoir fluids , particularly the expansion factor of the oil , or how much the oil expands when brought from high pressure , high temperature of the reservoir to `` stock tank '' at the surface . </P>
to hold greater quantities of liquid or gas a rock should have
to hold greater quantities of liquid or gas a rock should have
porosity
porosity