| Title | Application of SNHC Gas Equilibria in Monitoring Reservoir Processes in Tongonan Geothermal Field, Leyte, Philippines |
|---|---|
| Authors | D. B. Dacillo, E. V. Pamlla Jr. and F. D' Amore |
| Year | 1998 |
| Conference | PNOC-EDC Geothermal Conference |
| Keywords | |
| Abstract | The novel gas equilibrium reaction (SNHC) is introduced as a method to calculate reservoir parameters such as temperature, steam paction and C02 partial pressure. The new approach incorporates NH3 and N2 as an extension of the IT-HSH gas equilibria. The applicability of the method in monitoring reservoir processes in Tongonan geothermal field is evaluated using wells that have been established to have undergone processes such as reinjection returns, pressure drawdown and interplay of feed zones. Wells with various range in enthalpy representing the different fluid discharge characteristics porn all the sectors in Tongonan were also evaluated. Initial evaluation shows that the reservoir processes in each subject wells suggested by the SNHC method is fairly consistent with processes established by the conventional water and gas chemistry monitoring tools such as TSio2, CYres and C02m trends. However, discrepancies in calculated temperature and Pco2 values are observed in wells 105D and 501 in the Mahiao and Malitbog sector respectively. These wells are observed to be discharging highly degassed waters with reservoir steam paction of about - 0.3. Temperature and Pco&fference obtained are >320░C and >*lo% respectively. |