Reservoir Permeability Assessment of the Mindanao Geothermal Field, Philippines
- Key words
- Resource Characterization; reservoir permeability, fractures
- Conference
- Geothermal Resources Council Transactions
- Year
- 2006
- Session
- Resource Characterization; reservoir; fractures
- Language
- English
Abstract
The distribution of reservoir permeability in the Mindanao geothermal field varies generally for each sector (Matingao, Marbel and Sandawa). Steam bearing fractures are either low-angled or high angled with a random to semi-random orientation. The low- angled fractures may be confined to specific strata bounded by steep high-angled fractures which are represented by faults mapped at the surface. Most dominant strike of such subvertical to vertical faults trend NW (Marbel Corridor) and NNE in the Marbel-Sandawa interface. A lithologic break between the Upper sequence and Lower sequence of the Apo Volcanics defined by a claystone horizon also contributed to a field-wide permeability.
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