Application of electrical and radioactive well logging to ground-water hydrology

Patten, E.P.; Bennett, Gordon D.

doi:10.3133/wsp1544d

Cited by 5 publications

References 10 publications

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Why Electric Log Water Wells?

Zoblin¹

1964

Groundwater

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This paper describes an electric log and what it can do for water well contractors and ground‐water hydrologists. Electric logs furnish data on depth of hole, where casing should be set and perforated, static water levels, relative water‐yielding properties of aquifers, water quality, character of formations encountered, etc. The electric log is a permanent record of a water well which can assist in planning future repair work.

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Why Electric Log Water Wells?

Zoblin¹

1964

Groundwater

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Surface and Borehole Geophysical Methods in Ground Water Investigations

Mickam¹,

Levy²,

Lee³

1984

Groundwater Monitoring Rem

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Ground water flow in karst terranes generally occurs in the solution channels of carbonate aquifers. A hydrogeologist may utilize borehole geophysical methods to identify these solution channels in aquifers. Two specific methods that are applicable in karst terrains are: 1. Natural gamma ray logging 2. Borehole caliper logging. Gamma ray logging can detect the presence of inter‐bedded strata in the main limestone unit, such as shale, which emit high levels of gamma radiation. Gamma ray logging can also detect clay deposits in solution channels that may act to restrict the flow of ground water. The areal extent of these rock strata or clay‐filled solution channels can be determined when gamma ray logs are conducted at several borehole locations across the site of investigation. Borehole caliper logging can be employed to determine the presences of solution channels within the aquifer when penetrated by a borehole. In addition, since shale layers and clay filling are less resistant than the surrounding limestone, the caliper log may detect both the presence and the thickness of shale or clay layers in the aquifer. Gamma ray logs can be used in conjunction with caliper logs to provide data on the stratigraphic location and thickness of solution channels and clay and shale layers within a limestone aquifer. This information is valuable to the hydrogeologist performing investigations at sites located in limestone terranes because ground water flow preferentially occurs along solution channels.

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Application of Geophysical Logging to Groundwater Studies in Southeastern Saskatchewan

Dyck¹,

Keys²,

Meneley³

1972

Can. J. Earth Sci.

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Single-point resistance and spontaneous potential logs in fresh-water filled rotary-drilled test-holes provide data useful in geohydrologic studies in Saskatchewan. These geophysical logs are made by many of the water well drilling contractors in Saskatchewan on a routine basis. The logs provide good resolution of various lithologic units and provide data required to estimate the salinity of water in sand beds prior to constructing a well.Caliper logging offers a potentially useful method for evaluating hole conditions and the effect of drilling techniques on the formation in completion zones. The casing collar locator log run in a previously constructed well near Estevan demonstrates that this device can provide an accurate and objective measurement of the position and length of each joint of casing, the position of the screen assembly, and the location of screened and blanked intervals within the screen assembly. This tool should find general application in water well construction and maintenance practice.The neutron-epithermal neutron log provides a method of measuring the porosity of sand and gravel beds. The response of the gamma log is similar to that of the spontaneous potential log and the neutron-epithermal neutron log deflects in a fashion similar to the resistance and resistivity logs. Nuclear logs offer the advantage that they can be run in cased or uncased boreholes which may be filled with any type of fluid. They require more complicated and expensive instrumentation and slow-speed logging to obtain the required resolution. The normal resistivity logs offer the possibility of determining the concentration of dissolved solids in the formation water. The gamma-gamma log is a poor alternative to the natural gamma and neutron log for stratigraphic correlations.

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Application of electrical and radioactive well logging to ground-water hydrology

Cited by 5 publications

References 10 publications

Why Electric Log Water Wells?

Why Electric Log Water Wells?

Surface and Borehole Geophysical Methods in Ground Water Investigations

Application of Geophysical Logging to Groundwater Studies in Southeastern Saskatchewan

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