Olkaria geothermal field located in Naivasha kenya,is a high temperature geothermal system with several upflow zones.Hydrothermal alteration minerals and fluid geochemistry indicate that the northeast subfield is one of the upflow zones and is projected to be productive site for production drilling.Geothermal conceptual modelling requires a muiltidisplinary approach where among other methods geochemistry and borehole geology are key.