Characteristics of Broadlands-Ohaaki Water Chemistry, and Changes Subsequent to Initial Production

Abstract

The chemistry of initial discharges from wells in geothermal system, New Zealand, 'separate' deep waters, one typically discharged from wells in the northern portion of the system and the other discharged from southern wells. However, the primary source of these two waters is likely the same, with only processes along separate north and south 'pathways' being different. Boiling is the dominant process affecting the northern waters, whereas southern waters are diluted considerably before undergoing any boiling. dilute chloride water, rich in bicarbonate. It has developed on the margin of the system (and over its top) by the condensation of steam plus into meteoric waters. to some extent northern (Ohaaki) production waters subsequent to initiation of discharge testing. However, this dilution appears to have been caused by a greater contribution from a shallow feed to the well s rather than dilution in the production formation itself. The dilution water is cool, These condensates