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Absolute elemental concentrations from nuclear spectroscopy

An elemental, absolute yield technique, applied in the field of neutron-induced gamma-ray spectroscopy, can solve the problems of highly complex logging tools, long measurement time, etc.

Active Publication Date: 2011-06-01
PRAD RES & DEV LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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 embodiments, not all features of an actual implementation are described in the specification. It should be recognized that in the development of any such practical implementation, as in any engineering or design project, multiple implementations (specific decisions) must be made to achieve the developer's specific goals, e.g. with system-related and business-related constraints flexibility, which varies from one implementation to another. Furthermore, it should be appreciated that such a development effort might be complex and time consuming, yet would nevertheless be a procedural undertaking of design, fabrication, and production for one of ordinary skill having the benefit of this disclosure.

[0016] Embodiments of the presently disclosed subject matter generally relate to systems and methods for neutron-induced gamma-ray spectroscopy. In particular, the pre...

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Abstract

The present invention discloses a system and method for estimating absolute elemental concentrations of a subterranean formation from neutron-induced gamma-ray spectroscopy. 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 relates generally to neutron-induced gamma-ray spectroscopy, and more particularly to techniques for determining absolute elemental concentrations from neutron-induced gamma-ray spectroscopy. Background technique [0002] Using nuclear downhole tools, the elemental concentrations of subsurface formations can be determined using a variety of techniques. Formation lithology can be determined indirectly using information from density and photoelectric effect (PEF) measurements of gamma rays scattered in the formation. Formation elements can be detected directly by detecting neutron-induced gamma rays. Neutron-induced gamma rays may be generated when the neutron source emits neutrons into the formation, which may interact with formation elements through inelastic scattering, high energy nuclear reactions, or neutron capture. [0003] Gamma rays emitted in an inelastic scattering nuclear event ("inelastic gamma ray") or a neutron ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V5/10
CPCG01T1/00G01V5/00G01V5/101G01V5/10
Inventor 吉姆·A·格劳马库斯·伯海德克里斯蒂安·斯特勒
Owner PRAD RES & DEV LTD
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