ANALYSIS OF MAJOR IONS AND STABLE ISOTOPES (δD, δ18O) FOR THE DETERMINATION OF NATURE CHARACTERISTICS AND SOURCE OF PRODUCED OILFIELD WATER

Abstract

Produced water from oil fields comprises different sources including forming water, injection water,
and residual drilling mud filtrate fluids. Assessment of the nature and origin of the produced water
plays an important role in the management of the water-flooding process and the reservoir
development lifecycle. Two techniques for this assessment are analyses of ions and stable isotopes.
Each analytical result provides different information of produced water and further data interpretation
would help calculate the proportions of the waters and fluids in the mixture. Our analytical results for
the produced water collected show a large fraction of formation water which is salty, full of minerals,
metamorphical and chloride- calcium characteristic.