Well-Site Evaluation of Logs From a Geothermal Well
- Key words
- Wells; USA; Oregon; Ontario; Logging; Lithology; Gas Content; Temperature; Mud Circulation
- Location
- Ontario, Oregon
- Conference
- Geothermal Resources Council Transactions
- Year
- 1980
- Session
- Well logging; Lithology; Hydrothermal alteration; Fractures;
- Language
- English
Abstract
This paper presents the case history of a well site analysis of a suite of logs from a moderate temperature (350°F) geothermal well. From logs and drill cutting data, a set of diagnostic criteria for each of the lithologic types in the well was developed. From these criteria a lithologic zonation of the reservoir was derived. Using a set of fracture detection criteria based on all available well logs, the probability of occurrence of fractures at various depths was qualitatively evaluated. Although the mud log showed significant methane concentration, the detection and estimation of reservoir gas content from well logs was not successful because of data limitation. The equilibrium formation temperature was estimated from logs but is not discuses in this paper in detail.
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