The Geothermal Collection
Permanent URI for this collection
Browse
Recent Submissions
1 - 10 of 1493
-
ItemCore photos, Hole 2 (KMA-1), Humu‘ula Groundwater Research Project(University of Hawaii at Manoa, 2016)Also known as “PTA” or “Saddle Road Project,” the Humuʻula Groundwater Research Project (HGRP) aimed to research the groundwater resources in the Hawaiʻi Island ‘Saddle’ region between Mauna Loa and Mauna Kea volcanoes by drilling two test holes on Army Garrison Hawaii land. Results include the discovery of: i) groundwater at a much shallower depth than expected, ii) a dike-impounded aquifer, and iii) a potential geothermal reservoir. By using the diamond wireline core drilling technology, we collected a continuous sequence of rock core. We documented our progress in a blog and made a complete stratigraphic record of the region. This continuous stratigraphic sequence contained subaerial shield-stage and post-shield-stage lava rock and ash samples from the Mauna Kea Volcano, documenting the area’s environmental, geologic, hydrologic, and thermal history.
-
ItemCore photos, Hole 1 (PTA-2), Humu‘ula Groundwater Research Project(University of Hawaii at Manoa, 2016)Also known as “PTA” or “Saddle Road Project,” the Humuʻula Groundwater Research Project (HGRP) aimed to research the groundwater resources in the Hawaiʻi Island ‘Saddle’ region between Mauna Loa and Mauna Kea volcanoes by drilling two test holes on Army Garrison Hawaii land. Results include the discovery of: i) groundwater at a much shallower depth than expected, ii) a dike-impounded aquifer, and iii) a potential geothermal reservoir. By using the diamond wireline core drilling technology, we collected a continuous sequence of rock core. We documented our progress in a blog and made a complete stratigraphic record of the region. This continuous stratigraphic sequence contained subaerial shield-stage and post-shield-stage lava rock and ash samples from the Mauna Kea Volcano, documenting the area’s environmental, geologic, hydrologic, and thermal history.
-
ItemPreliminary core box photos, Lanai Island(University of Hawaii at Manoa, 2019)This unique project seeks to explore the geologic structures that exist in the caldera region of Hawaiian volcanoes; how those structures influence groundwater storage and flow; and how the magmatic heat from Hawaiian shield volcanoes cools over time.
-
ItemArchive core photos, Hawaii Scientific Drilling Project(University of Hawaii at Manoa, 1999)An abandoned quarry at Hilo International Airport was the site for the second phase of the Hawaii Scientific Drilling Project. From March 13, 1999, to September 27, 1999, using a commercial drilling rig and a hybrid coring system, the project core-drilled a hole to 3,098 meters below sea level (total depth of 3,110 meters) with 98 percent recovery.
-
ItemPuna Geothermal Venture supports science summer camps for kids at ‘Imiloa(University of Hawaii Foundation, 2010)UH Hilo’s ‘Imiloa Astronomy Center of Hawai‘i received a $5,000 gift from Puna Geothermal Venture (PGV) and its parent company Ormat. The gift subsidized program tuition costs for local schoolchildren to attend ‘Imiloa’s Summer Camp programs focused on sustainable technology. The gift will also enable ‘Imiloa to expand its outreach into school classrooms in the Keaau, Pahoa, Puna areas of the Big Island.
-
ItemGravity and magnetic surveys in support of geothermal exploration on Maui, Hawaii(Indiana University, 1980?)Detailed gravity and magnetic land surveys were conducted on the island of Maui during the summer of 1980. Part I: the purpose of the study, its scope, and the geology of the area. Part II: the field methods used and the reduction of data to map and cross-section form. Part III: the data analysis to date. Four areas were mapped: Lahaina-Olowalu, Paia-Haiku, Hana, and Makena.
-
ItemHawaii Scientific Drilling Project : core logs and summarizing data 1999(Hawaii Scientific Drilling Project, 1999)Contents: map of drill site location; procedures for core handling, core logging, and sampling; core run depth log; core box record form; unit summary; reference sample record form; lithologic column and summary; and core logs
-
ItemWater and gas chemistry from HGP-A geothermal well : January 1980 flow test(Geothermal Resources Council, 1980-09)During January 1980, a two-week production test was conducted on the geothermal well HGP-A. Brine chemistry indicates that approximately six percent of the well fluids are presently derived from seawater and that this fraction will probably increase during continued production. Reservoir production is indicated to be from two chemically distinct aquifers: one having relatively high salinity and low production and the other having lower salinity and producing the bulk of the discharge.
-
ItemHydrothermal alteration of basalts from Hawaii Geothermal Project Well-A, Kilauea, Hawaii(Geology Journal, 1978-07)Mineralogical examination of basaltic rocks obtained during drilling of a successful 1,962-m-deep geothermal well (HGP-A) in the east rift zone of Kilauea Volcano, Hawaii, reveals three zones of hydrothermal alteration beneath a zone of unaltered lavas. Each alteration zone is characterized by the dominance of a particular mineral: zone 1, montmorillonite; zone 2, chlorite; zone 3, actinolite. Three zones of relative permeability can be tentatively identified on the basis of filled versus partly filled vesicles and fractures. Because the well has not returned to thermal equilibrium as of this writing, stability relations between secondary minerals and temperatures cannot be calculated with accuracy. However, the latest downhole temperatures measured at the boundaries of alteration zones, compared with similar data from high temperature geothermal areas in Iceland, indicate that HGP-A temperatures are considerably higher than those encountered for the same alteration-zone boundaries in Icelandic wells. This indicates that the present-day thermal regime in HGP-A is relatively young and that the hydrothermal minerals probably have not reached equilibrium with existing conditions.
-
ItemHGP-A reservoir engineering(College of Engineering, University of Hawaii at Manoa, 1978-09)The Hawaii Geothermal Project well HGP-A has undergone a two-year testing pr.ogram which included cold water pumpdown tests, flashing flows with measurements of temperature and pressure profiles, and noise surveys. These tests and the data obtained are discussed in detail. While the pumpdown tests conducted right after the slotted liner had been installed and the mud removed indicated that the well had very poor permeability, HGP-A was flashed successfully on July 2, 1976. Maximum quiescent bottomhole temperature following that initial flash was measured to be 358°C. Comparison of subsequent discharges shows that with each succeeding test, the flow rate has increased, possibly due to the displacement of drilling mud embedded in the wellbore surface. The flow rates range from a maximum of 101 Klb/hr at wellhead pressure of 51 psig to a throttled 76 Klb/hr at 375 psig wellhead pressure, with possible electrical power production of 3.0 to 3.5 MWe. Temperature and pressure profiles taken during flow tests indicate that the fluid in the we1lbore is a mixture of liquid and vapor at saturation conditions. The absence of a liquid level during flashing discharge confirms that flashing is occurring in the formation. Pressure drawdown and buildup analyses yield a value of transmissibility (kh) of approximately 1000 millidarcy-feet with a pressure drop across the apparently damaged skin of 500-600 psi. The pressure profiles taken during flashing flow consist roughly of three approximately constant gradient lines that intersect at the junction of the casing and the slotted liner, and at approximately 4300 feet depth, which leads to the conclusion that the major production zones are near bottomhole and in the vicinity of 4300 feet. Furthermore, the data points on the log-log Horner type plot seem to fallon two different but consecutive straight-line approximations. This could be interpreted to be the result of two different production layers with different kh values.