油藏物理学一一岩石粒度组成与比面 classification on specific surface A s is based on bulk volume S= Sp is based on Pore volume Sp- A p A SS is based on sand grain volume.Ss= s油藏物理学——岩石粒度组成与比面 classification on specific surface : S is based on bulk volume V A S  P P V A S  S S V A S  SP is based on Pore volume SS is based on sand grain volume