摘要
利用蒙特卡罗中子-粒子输运程序(MCNP)分别模拟了不同脉冲宽度的脉冲中子源产生的中子与地层作用过程中,各种能量的中子和热中子的时间谱;利用不同孔隙度、矿化度、含水饱和度等条件下的热中子时间谱,分析得出储层的宏观俘获截面和孔隙度、矿化度以及饱和度的线性关系,为PNN(脉冲中子-中子)测井方法的理论研究提供了依据。
The time spectrum of all kinds energy neutrons and thermal neutrons, which resulted from the interaction between the formation and neutrons induced by the pulsed neutron source of the different pulsed width, are simulated by Monte Carlo Neutron-particles code. The time spectrum of thermal neutrons under the conditions of the different porosities, salinities and saturations are simulated. The linear relations between formation macroscopic cross sections and porosity, salinity and saturation are gained by the time spectrums, respectively. The results will lay the foundation for the study of PNN logging.
出处
《同位素》
CAS
北大核心
2005年第1期21-25,共5页
Journal of Isotopes
关键词
MCNP
脉冲中子测井
热中子时间谱
宏观截面
MCNP
pulsed neutron logging
thermal neutron time spectrum
macroscopic cross section
