| Title | Fault Set Analysis of Reinjection Area in the Mahanagdong Geothermal Field, Leyte Philippines |
|---|---|
| Authors | J. A. Caranto, R. D. Leynes and M. A. Aurelio |
| Year | 1996 |
| Conference | PNOC-EDC Geothermal Conference |
| Keywords | |
| Abstract | An analysis of brittle deformations in the Boo Valley and Cambantog reinjection areas of the Mahanagdong Geothermal Field was conducted to determine the tectonic signature of the structures. Stress computations indicate wells MG-IRD and MG-4RD in Bao Valley and wells MG-5RD and MG-6RD in Cambantog intersected extensional shuctures. Both areas show intense pacturing and intense alteration, and are hosts for numerous hot springs Theoretically, structures under extension should exhibit good subsurface permeability. However, the wells in Bao Valley have very limited permeability whereas the wells in Cambantog exhibited very good permeability and high reinjection capacitiies. Stratigraphic correlation shows that the wells in Bao valley encountered formations that are inherently impermeable owing to their æplastic character whereas the wells in Cambantog were drilled through formations that lend themsehes to good fiactunæng. Fault set analysis should therefore be incorporated with data jFom other disciplines such as subsurface Iithological characteristics and well-fault intersection correlation to effectively determine structures that are more likely permeable. |