Interpretation of Downhole Data and Development of a Conceptual Model for the Redondo Creek Area of the Baca Geothermal Field

Abstract

Drilling records, downhole pressure and temperature surveys, and surface discharge measurements available from the Redondo Creek area wells are analyzed to define the thermodynamic state of the reservoir fluid and to determine the locations of permeable horizons. The reservoir fluid contains a significant amount of carbon dioxide. A two‐phase region is present within the reservoir; the extent of this region is profoundly influenced by the carbon dioxide content of reservoir fluid. Two permeable zones are delineated, i.e., one within the Bandelier Tuff and one near the interface between the Bandelier Tuff and the underlying Paliza Canyon Andesite. This paper also presents a conceptual model of the Baca Geothermal Field. Baca is a high‐temperature liquid‐dominated field of moderate to low permeability. It is suggested that the reservoir is charged by hot upwelling fluids at a point near Sulfur Creek. These fluids flow laterally towards Redondo Creek and thence to ultimate outflow down the Jemez River valley.