抄録
Abstract The Shaly formation can be evaluated with the value of porosity and water saturation which are derived from Well logging, whether it will produce hydrocarbon or not. Recently, values of water saturation of shaly farmation are mostly derived from Induction-Sonic Combiration. Porosity of shaly formation could be derived from Formation Density-Sonic Combination more reliably. The writer tried to predict the formation evaluation by well logging of the Minemiaga Oil field and the Matsuzaki gas field, taking the above mentioned method.
