Forest fields temporary occupied by different industrial activities are restored to the silvicultural circuit after the industrial activity has ended. These fields should be apt for reforestation and should have admissible values regarding their content of dangerous substances. The present article describes and interprets the characteristics of soils from four fields occupied temporary by oil wells in Moine�ti, Bacau County. The content of clay, soluble salts and nutritive elements were analysed, together with the soil�s reaction, the content of hydrocarbons or other soil characteristics. The admissible values for installing, growing and developing forest species were then emphasized. The obtained results have illustrated the fact that the oil extraction activity had negative effects on soils, namely: a strong consolidation (especially on access roads); the truncation and/or derangement/mixture of horizons or soils stratums with the rock; depletion of nutritive substances; salinization, argilisation and pollution with oil residues. In order to render these fields back to the silvicultural circuit, bio remedy technologies must be applied or other measures that can eliminate the pollutant from the soil (decontamination methods), followed by pedoameliorative measures.