Density Log At Valles Caldera - Redondo Geothermal Area (Wilt & Haar, 1986)
Exploration Activity: Density Log At Valles Caldera - Redondo Geothermal Area (Wilt & Haar, 1986)
|Exploration Activity Details|
|Location||Valles Caldera - Redondo Geothermal Area|
|Exploration Technique||Density Log|
|Activity Date||- 1986|
The density log indicates three major density units within the well section : a surface layer of caldera fill, lake deposits, and other recent alluvium (2.12 g/); the Bandelier Tuff and underlying volcanic and sedimentary units (2.3--2.5 g/); and the basement unit, consisting of the lower Paleozoic and the upper Precambrian (2.65 g/). There are, of course, significant density variations within each unit, but for modeling purposes the use of simple three-layer sections is sufficient for determining structure and identifying major subsurface lithologic changes. Density logs from the nearby Fenton Hill Hot Dry Rock wells, where the basement is shallow (Jiracek et al., 1975), indicate lower density for the Paleozoic sections and highly variable density for the Precambrian. This suggests that gravity interpretation in areas of shallow basement may overestimate the depth to basement.
- Michael Wilt, Stephen Vonder Haar (1986) A Geological And Geophysical Appraisal Of The Baca Geothermal Field, Valles Caldera, New Mexico