| Abstract |
An integrated resource assessment of the Greater Tongonan geothermal field was conducted using the volumetric stored heat method. The Greater Tongonan field covers an area of about 40 sq. km., encompassing the current Mahiao-Sambaloran production sector (installed 112.5 MWe Tongonan I plant), the Upper Mahiao and Malitbog proposed development areas, and the separate Mahanagdong system. The assessment considered only the existing producing field and the likely production areas for future development and did not take into account the resupply of heat from the field's peripheries. Assuming conservative values for the various input parameters and a 25-year plant life, the total volumetric stored heat for Greater Tongonan is estimated at 362,330 MWt-years, equivalent to 530 MW of assessed electrical power. To appraise the effects of different estimates of recovery factor CRf) on the total assessed power capacity of Greater Tongonan, a sensitivity analysis was carried out. Similar analysis was done for conversion efficiency <CEf), load factor (Lf), rock density (/>r), rock specific heat (Cpr) and porosity. Results of the analysis indicate that the power estimate responds variably to the various parameters for each individually specified parameter increment. Power capacity is most sensitive to variations in Rf, moderately sensitive to increments in CEf and Cpr and slightly to almost insignificantly, to changes in Lf, /Or and porosity. |