A geothermal experiment by the University of Hawaii proved that the Kilauea East Rift Zone held geothermal potential. From 1990 to 1991, the Scientific Observation Hole (SOH) program operated three geothermal test wells in Puna, Hawaii:
- SOH-1: Lower Kilauea East Rift Zone
- SOH-2: Lower Kilauea East Rift Zone
- SOH-4: Between Puna Geothermal Venture and True/Mid-Pacific geothermal wells
Continuously cored, these exploratory slim holes ranged in depth from 5,500 to 6,800 feet. As for SOH-3, it was planned, but never drilled.
The data showed that a ten-mile interval along the Kilauea East Rift Zone held favorable high temperatures, as shown in the following:
|Geothermal Well||Temperature F (C)||Total Depth Drilled (feet)|
These holes provided data for the following:
- Assessing the geothermal potential of those areas.
- Determining rock types, alteration, and structures within the rift zones, the depth to potential geothermal reservoirs, the depth and composition of groundwater, and the temperature of rock and fluids at depth.
More Information about SOH
- A photographic record of the Scientific Observation Hole
- The Hawaii Scientific Observation Hole (SOH) Program
- The Hawaii Scientific Observation Hole (SOH) program : A case study and status report
- Summary geological report and index log of the Scientific Observation Hole #2 on the Kilauea East Rift Zone, Hawaii