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    • 8. 发明授权
    • Methods for sourceless density downhole measurement using pulsed neutron generator
    • 使用脉冲中子发生器的无源密度井下测量方法
    • US08476584B2
    • 2013-07-02
    • US13222152
    • 2011-08-31
    • Fusheng LiXiaogang Han
    • Fusheng LiXiaogang Han
    • G01V5/10
    • G01V5/101
    • Disclosed is a method for estimating a density of an earth formation penetrated by a borehole. The method includes: emitting a pulse of fast neutrons into the formation during a neutron-pulse time interval; detecting gamma-rays due to inelastic scattering and thermal capture of the emitted neutrons in the formation to provide a gamma-ray energy spectrum due to the inelastic scattering and the thermal capture during a first time interval within the neutron-pulse time interval and to provide a time spectrum of counts or count rates due to thermal capture during a second time interval occurring after the neutron-pulse time interval; determining a macroscopic capture cross section of the formation from a decay in the time spectrum of counts or count rates; determining an elemental weight fraction from the gamma-ray energy spectrum; and estimating the density of the formation using the macroscopic capture cross section and the elemental weight fraction.
    • 公开了一种用于估计钻孔渗透的地层的密度的方法。 该方法包括:在中子脉冲时间间隔期间,将快中子脉冲发射到地层中; 由于在中子脉冲时间间隔期间的第一时间间隔期间由于非弹性散射和热捕获而在地层中发射的中子的非弹性散射和热捕获来检测γ射线以提供伽马射线能谱,并提供 在中子脉冲时间间隔后发生的第二时间间隔期间由于热捕获引起的计数或计数率的时间谱; 从计数或计数率的时间谱中的衰减确定地层的宏观捕获截面; 从伽马射线能谱确定元素重量分数; 并使用宏观捕获截面和元素重量分数来估计地层的密度。