Proceedings of the 7th New Zealand Geothermal Workshop 1985. Geochemical changes in response to production and reinjection for Palinpinon-I geothermal field, Negros Oriental, Philippines. New Zealand Geothermal Workshop [7, 6-8 Nov. 1985, New Zealand].

Harper, R.T.. Jordan, O.T.

1985

CIENA
1067

0-86869-065-1

Chemical changes observed for production wells since the commissioning of the 112.5MWe Palinpinon-I power station (May, 1983) have been attributed to reinjection fluid returns and in some cases, localised pressure drawdown. Although there is clear evidence for a mass front of reinjection fluid to the production sector, no thermal front has as yet been confirmed. A field management strategy has developed in an attempt to minimise reinjection fluid returns. Chloride concentrations in separated water have been successfully used to trace and quantify reinjection fluid returns on an individual production well and field basis. The magnitude of this and other sources of recharge depend upon power station load, production and reinjection well configurations and production well status or discharge history. Silica concentrations have remained controlled by quartz solubility despite large increases in reservoir chloride. Calcium and sulphate responses indicated dissolution of Ca-bearing minerals within the reinjection sector and re-deposition of anhydrite as fluid migrated away from the reinjection sector. ABSTRACT. INTRODUCTION. CHEMICAL CHANGES IN RESPONSE TO EXPLOITATION. Silica chemistry. Calcium and sulphate chemistry. Gas chemistry. Other parameters. MINERAL DEPOSITION. ACIDITY. SILICA DEPOSITION. SUMARY AND CONCLUSIONS. ACKNOWLEDGEMENTS. REFERENCES.

Presenta diagrs. y gráfs.

FILIPINAS; ENERGIA GEOTERMICA; GEOTERMIA; REINYECCION; POZOS GEOTERMICOS; GEOQUIMICA; PRODUCCION; FLUIDOS GEOTERMICOS; CAMPOS GEOTERMICOS;