WRRCTR No. 75 Neutron Well Logging in Hawaii

dc.contributor.author Peterson, Frank L. en_US
dc.date.accessioned 2010-10-04T21:53:53Z
dc.date.available 2010-10-04T21:53:53Z
dc.date.issued 1974-02 en_US
dc.description.abstract In 1970, the Water Resources Research Center initiated a study of neutron well logging techniques in Hawaii. The primary objective of this study was to apply neutron logging techniques to the problem of obtaining reliable porosity data and relating these to water yields from Hawaiian aquifers. Neutron well logging in Hawaiian basaltic formations has produced much important qualitative and quantitative information. The most important application has been the determination of porosity in the saturated zones. Interpretation of neutron log responses in Hawaiian basaltic formations is similar to conventional neutron log interpretation in sedimentary formations. Neutron count varies as an inverse function of porosity. High neutron counts are indicative of low porosities and low neutron counts are indicative of high porosities. In general, the neutron logs are extremely responsive to detailed changes in formation porosity, and of particular importance is that the reproducibility of neutron logs from the same well is excellent. Neutron logs from Hawaiian wells also are extremely responsive to the saturated-unsaturated boundary and to the casing termination. Surprisingly, the neutron logs show little consistent response to nominal hole diameter or borehole fluid salinity. Probably the best use of the neutron logs is in conjunction with other borehole geophysical logs. Correlation between neutron Logs and electric resistivity logs is particularly good. en_US
dc.description.sponsorship OWRR Project No. A-032-HI, Grant Agreement No. 14-31-0001-3511 The programs and activities described herein were supported in part by funds provided by the United States Department of the Interior as authorized under the Water Resources Research Act of 1964, Public Law 88-379. en_US
dc.format.extent vi + 42 pages en_US
dc.identifier.citation Peterson FL. 1974. Neutron well logging in Hawaii. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 75. en_US
dc.identifier.uri http://hdl.handle.net/10125/18110
dc.publisher Water Resources Research Center, University of Hawaii at Manoa en_US
dc.relation.ispartofseries WRRC Technical Reports en_US
dc.relation.ispartofseries 75 en_US
dc.subject.lcsh Radiation well logging. en_US
dc.subject.lcsh Porosity. en_US
dc.subject.lcsh Geophysical well logging. en_US
dc.subject.lcsh Basalt -- Hawaii. en_US
dc.subject.lcsh Aquifers -- Hawaii. en_US
dc.subject.lcsh Soil permeability -- Testing. en_US
dc.subject.lcsh Groundwater -- Hawaii -- Oahu. en_US
dc.subject.lcsh Soils -- Hawaii -- Oahu. en_US
dc.title WRRCTR No. 75 Neutron Well Logging in Hawaii en_US
dc.type Report en_US
dc.type.dcmi Text en_US
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