Abstract
The concentration of Cl', HCO2' and CO3" of the water produced by wells of Innai Oil Field are analyzed simultaneously, October 1952. Concentrations, reaction values and composition of these ions reveal the intimate relation to the structure of oil reservoir. Especially of the first zone, the change of concentration may be explained by the flooding of dilute water from south to north, horizontally along the contour of the surface of reservoir.
