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Laboratory Experiments of Neutron Induced Gamma Ray Spectrometry Tool
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 24th European Meeting of Environmental and Engineering Geophysics, Sep 2018, Volume 2018, p.1 - 5
Abstract
Gamma spectral logging is a radioactive logging method that can measure the constituents of formation. This method of measuring the constituents of formation can be used not only for evaluation of unconventional reservoirs but also for evaluating the changes in water quality of groundwater and the interaction of aquifers with contaminated fluid and formation. In this study, two kinds of neutron source, three kinds of detectors and MCNP numerical modeling were used as basic studies for the equipment development of gamma spectrum. Gamma ray measurements were made using commercial products and self-developed systems. MCNP numerical modeling was applied to the design and performance prediction of sonde, and various rock blocks were used for the field test. Gamma spectra were measured in the neutron-capture gamma mode and some measured peaks included the effects of cylindrical pipes. Although the discrimination of the energy peaks of constituent elements in the measured gamma spectrum is not as easy as expected but the apparent components such as hydrogen in the water tank were well identified. It is expected that performance will be improved if it is continuously updated based on the test result up to the present.