ABSOLUTE ELEMENTAL CONCENTRATIONS FROM NUCLEAR SPECTROSCOPY
    45.
    发明申请
    ABSOLUTE ELEMENTAL CONCENTRATIONS FROM NUCLEAR SPECTROSCOPY 审中-公开
    核子光谱的绝对元素浓度

    公开(公告)号:WO2010002796A2

    公开(公告)日:2010-01-07

    申请号:PCT/US2009/049070

    申请日:2009-06-29

    CPC classification number: G01V5/00 G01V5/101

    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 for estimating an absolute yield of an element in a subterranean formation may include a downhole tool and data processing circuitry. The downhole tool may include a neutron source to emit neutrons into the formation, a neutron monitor to detect a count rate of the emitted neutrons, and a gamma-ray detector 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.

    Abstract translation: 提供了用于从中子诱导的γ射线光谱估计地下地层的绝对元素浓度的系统和方法。 在一个示例中,用于估计地下地层中的元素的绝对产量的系统可以包括井下工具和数据处理电路。 井下工具可以包括用于将中子发射到地层中的中子源,用于检测发射的中子的计数速率的中子监测器,以及伽马射线检测器,以获得至少部分地从非弹性γ射线得到的γ射线谱 由非弹性散射事件和中子俘获伽马射线产生的中子俘获事件。 数据处理电路可以被配置为确定来自伽马射线光谱的相对元素产量,并且至少部分地基于相对元素产量与发射中子的计数率的归一化来确定绝对元素产量。

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