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WRRCTR No. 75 Neutron Well Logging in Hawaii

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Title: WRRCTR No. 75 Neutron Well Logging in Hawaii
Authors: Peterson, Frank L.
LC Subject Headings: Radiation well logging.
Geophysical well logging.
Basalt -- Hawaii.
Aquifers -- Hawaii.
show 3 moreSoil permeability -- Testing.
Groundwater -- Hawaii -- Oahu.
Soils -- Hawaii -- Oahu.

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Issue Date: Feb 1974
Publisher: Water Resources Research Center, University of Hawaii at Manoa
Citation: Peterson FL. 1974. Neutron well logging in Hawaii. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 75.
Series/Report no.: WRRC Technical Reports
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.
Sponsor: 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.
Pages/Duration: vi + 42 pages
Appears in Collections:WRRC Project Reports

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