| Title | A Preliminary Report on Fractured Igneous Rock Environment Test Pits |
|---|---|
| Authors | Mathews, Mark A.; Scott, James; LaDelfe, Carol M. |
| Year | 1983 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Exploration; USA; Colorado; Denver Federal Center Laboratory; Geophysical Logs; Formation Evaluation; Calibration Models; Rock Types; Cores; Density; Porosity; Velocity; Sonic; Neutron; Natural Gamma; Test Pits; USGS-WRD |
| Abstract | Geophysical well logs can now be calibrated for the measurement of physical properties of some igneous and metamorphic lithologies and for the determination of fracture porosity. These geological conditions are routinely encountered in geothermal reservoirs and geothermal fields. Three large calibration models or test pits were completed on May 1, 1981, at the United States Geological Survey (USGS) Denver Federal Center Calibration Facility. Each calibration model was constructed of large stone blocks that have a cored borehole and wire sawn simulated fractures. Details of the test pit size, simulated fracture locations, rock type of each test pit, and location and access of these pits are discussed herein. Geophysical well logs were obtained from these test pits and these data are shown an discussed. |