Nuclear well logging in soils. Calibration of slim hole nuclear tools gamma-gamma and neutron-thermal neutron.

Details

Serval ID
serval:BIB_8601
Type
Inproceedings: an article in a conference proceedings.
Collection
Publications
Institution
Title
Nuclear well logging in soils. Calibration of slim hole nuclear tools gamma-gamma and neutron-thermal neutron.
Title of the conference
4th Meeting, EEGS European Section
Author(s)
Baron L., Chapellier D.
Organization
Environmental and Engineering Geophysical Society (European section)
Address
Barcelona-Spain
Publication state
Published
Issued date
09/1998
Pages
275-278
Language
english
Notes
Baron199814-17 September 1998
Abstract
The calculation of elasticity parameters by sonic and ultra sonic wave propagation in saturated soils using Biot's theory needs the following variables : forpiation density and porosity (p, ø), compressional and shear wave velocities (Vp, Vs), fluid density, viscosity and compressibility (Pfi Ilfi Ki), matrix density and compressibility (p" K), The first four parameters can be determined in situ using logging probes. Because fluid and matrix characteristics are not modified during core extraction, they can be obtained through laboratory measurements. All parameters necessitate precise calibrations in various environments and for specific range of values encountered in soils. The slim diameter of boreholes in shallow geophysics and the high cost of petroleum equipment demand the use of specific probes, which usually only give qualitative results. The measurement 'of density is done with a gamma-gamma probe and the measurement of hydrogen index, in relation to porosity, by a neutron probe. The first step of this work has been carried out in synthetic formations in the laboratory using homogeneous media of known density and porosity. To establish borehole corrections different casings have been used. Finally a comparison between laboratory and in situ data in cored holes of known geometry and casing has been performed.
Create date
19/11/2007 10:37
Last modification date
20/08/2019 14:45
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