多探测器硼中子伽马测井的可行性

为降低测井成本，研究在向储层注入硼酸溶液的条件下，用镅铍源代替脉冲中子源进行中子伽马测井来研究水淹层剩余油饱和度硼中子伽马测井；用Monte Carlo模拟技术，首先计算了不同岩性、孔隙度、矿化度和源距条件下的俘获伽马计数与含水饱和度的关系，从而论证丁硼中子伽马测井是可行的；利用注硼前后俘获伽马计数与源距的关系，得出可以在硼中子伽马测井仪器上设置2个或多个探测器的具体构想。

Feasibility Investigation of Multi-detector Boron Neutron-gamma Log

To lower logging cost, it is feasible to carry neutron-gamma log by using americium-beryllium source instead of pulsed neutron source under the condition of injecting boric acid into reservoirs(which is called boron neutron-gamma log).With Monte Carlo simulating technique, given is relation between captured gamma count rate and water saturation under the condition of different lithology, different porosity, different mineralization and different spacing.The result indicates that it is feasible to carry out boron neutron-gamma log.It is completely feasible to set two or more detectors in boron neutron-gamma logging tool according to the relation between captured gamma count rate and spacing before or after injecting boric acid into reservoirs.