Mostafa Yavari - MS of Soil Science and Chemistry , Drilling Technical Services NIDC
Abdolnabi Abdeh kolahchi - Soil Conservation and Watershed Management research Institute (SCWMRI)

Soil and water contaminated by industrial, urban, and agriculture pollution. TotalPetroleum hydrocarbons (TPHs) from exploration drilling fluid have destructiveand irreversible effects on the environment and ecosystems in the explorationregions. This study examined the impact of drilling mud pollution in physical andchemical properties of soil at four sites with variety of operational areas in South-West of Iran. Several soil samples from the exploration oil drilling area werecollected and the physical and chemical properties of them were analyzed.In addition the non-infected soil smeared with ۰, ۲۵, ۵۰, ۷۵ and ۱۰۰% percentageof drilling mud as well. The statistical results show that concentrations of sodiumand acidity of the soil contamination by oil-based drilling mud at ۷۵ and ۱۰۰% at۱% level Duncan test are significant. This appears to be due to the high soil acidityand the amount of oil based drilling mud in containing sodium bentonite. Also dueto the presence of organic matter in oil based drilling mud and adhesion of soilparticles with aggregates, bulk density increased.

Soil physical properties, chemical properties of soil, oil based drilling mud, petroleumhydrocarbons