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Absolute elemental concentrations from nuclear spectroscopy

An absolute element and energy spectrum technology, applied in the field of neutron-induced gamma ray spectroscopy, can solve the problems of highly complex logging tools and long measurement time

Active Publication Date: 2013-11-06
PRAD RES & DEV LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The use of activated and / or natural gamma ray measurements can also have various disadvantages
For example, such measurements may often require highly sophisticated logging tools and long measurement times

Method used

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  • Absolute elemental concentrations from nuclear spectroscopy
  • Absolute elemental concentrations from nuclear spectroscopy
  • Absolute elemental concentrations from nuclear spectroscopy

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Embodiment Construction

[0015] One or more specific embodiments are described below. In an effort to provide a concise description of these examples, not all features of actual implementations are described in the specification. It should be recognized that in the development of any such actual implementation plan, such as any engineering or design project, multiple implementation plans (specific determinations) must be made to achieve the specific goals of the developer, such as system-related and business-related constraints Flexibility, which differs between one implementation and another. In addition, it should be recognized that this kind of research and development work may be complicated and time-consuming, but it is a procedural task of design, manufacture, and production for ordinary technicians who benefit from the present disclosure.

[0016] Embodiments of the presently disclosed subject matter generally relate to systems and methods for neutron induced gamma ray spectroscopy. Specifically...

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Abstract

Systems and methods for estimating absolute elemental concentrations of a subterranean formation from neutron-induced gamma-ray spectroscopy are provided. In one example, a system (10) for estimating an absolute yield of an element in a subterranean formation may include a downhole tool (12) and data processing circuitry (14). The downhole tool may include a neutron source (18) to emit neutrons into the formation, a neutron monitor (20) to detect a count rate of the emitted neutrons, and a gamma-ray detector (26,28) to obtain gamma-ray spectra deriving at least in part from inelastic gamma-rays produced by inelastic scattering events and neutron capture gamma-rays produced by neutron capture events. The data processing circuitry may be configured to determine a relative elemental yield from the gamma-ray spectra and to determine an absolute elemental yield based at least in part on a normalization of the relative elemental yield to the count rate of the emitted neutrons.

Description

Technical field [0001] The present disclosure generally relates to neutron-induced gamma-ray spectroscopy, and more specifically relates to a technique for determining absolute element concentration from neutron-induced gamma-ray spectroscopy. Background technique [0002] Using nuclear downhole tools, various techniques can be used to determine the element concentration of the underground formation. The formation lithology can be determined indirectly using information from the density of the gamma rays scattered in the formation and the photoelectric effect (PEF) measurements. The formation elements can be directly detected by detecting neutron-induced gamma rays. When the neutron source emits neutrons into the formation, neutron-induced gamma rays can be generated, and the neutrons can interact with formation elements through inelastic scattering, high-energy nuclear reaction, or neutron capture. [0003] Gamma rays emitted in an inelastic scattering nuclear transition ("inela...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V5/10
CPCG01T1/00G01V5/00G01V5/101
Inventor 吉姆·A·格劳马库斯·伯海德克里斯蒂安·斯特勒布拉德·罗斯科詹姆斯·桑顿
Owner PRAD RES & DEV LTD
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