Permeability Mapping
- Key words
- Injectivity Index, II, Productivity Index, PI, field, reservoir, boundary, permeability, feedzone
- Conference
- World Geothermal Congress
- Year
- 2015
- Session
- Resource Assessment
- Language
- English
- Paper number
- 16021
Full text
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Abstract
This paper introduces a permeability parameter called the Total Initial Injectivity Index Linear Density Average (TIIILDA, pronounced “tilde”) defined as the initial total well II as measured during a stage test or completion test divided by the length of open wellbore in km (t/h/bar/km), the natural units of which is time. Mighty River Power’s four operating geothermal reservoirs typically have values corresponding to an outer boundary of ~1 microsecond (µs), an injection area of 5 to 10 µs. This metric can aid targeting of injection wells in all geothermal fields as well as production wells in mainly single-phase, compressed-liquid reservoirs like Ngatamariki. It also allows for simple identification of field geometry and boundaries using an objective measure.
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