Abstract: The conglomerate reservoir in Karamay oil field is characterized by complicated lithology, serious heterogeneity, varied salinity of injected water, which result in difficulty of quantitative interpretation of watered-out zones in it. This paper develops the models for lithology-based oil saturation, water cut and watered-out index by multivariate regression analysis. In combination with variation of the formation resistivity, the accuracy of well log interpretation of the watered-out zones can be effectively improved, thus meeting the demand of actural application of this technique.

Key words: Karamay oil field, conglomerate reservoir, well log interpretation, oil saturation, water cut, watered-out index, resistivity