INTERPRETATION OF WIRE-LINE LOGS FROM THE WALLULA PILOT WELL, COLUMBIA RIVER FLOOD BASALTS

Columbia River Flood Basalts have the potential to be a substantial carbon dioxide sequestration target. The Wallula basalt pilot well was drilled in 2009 for the purpose of testing the feasibility of long-term carbon dioxide sequestration. We examined wire-line logs, cuttings, and regional geochemical data for the Columbia River Flood Basalts to identify patterns for recognition of basalt lithofacies and stratigraphy. Key features of logs examined were caliper, natural gamma ray, thermal neutron porosity, formation density, and resistivity. Samples were examined in hand sample and thin section. We illustrate that it is possible to use modern borehole logging techniques to identify lithostratigraphic subdivisions within the Columbia River Flood Basalt Group and to identify zones of optimal injection for the purpose of long-term carbon dioxide sequestration.