Estimation of Steam Saturation and Rock Alteration from Geothermal Well Logs--A Theoretical Inquiry
- Key words
- Reservoir Engineering; USA; California; Numerical Modeling; The Geysers; Models; Density Log; Neutron Log; Gamma Ray
- Conference
- Geothermal Resources Council Transactions
- Year
- 1981
- Session
- Well logging; Hydrothermal alteration; Reservoir engineering
- Language
- English
Abstract
This paper considers the possibility of using well logs to estimate steam saturation (or steam quality) in a geothermal reservoir. The expected responses of density and neutron logs are calculated as a function of steam quality in the reservoir assuming a granitic matrix with 7 percent porosity. It is shown that only for small steam quality values, density and neutron log responses can be used to estimate steam saturation. Hydrothermal alternation in the rock should be indentified form log responses, particularly gamma ray.
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