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针对国内中子测井所使用探测器探测效率不能满足实际应用的情况,采用~(241)Am-Be中子源和LaBr_3:Ce探测器在中石油公司一个放射性同位素中子测试井中对H、C、Fe等几种地壳元素进行了测量,并与现今测井常用的锗酸铋(Bismuth Germanium Oxide,BGO)探测器进行对比测量。测得的能谱结果对比发现,进行地壳元素测量时LaBr_3:Ce探测器比BGO探测器具有更高的能量分辨率,并且在相同外部测试条件下BGO探测器探测到Fe峰非常微弱。因此将LaBr_3:Ce探测器进一步应用到测井中的市场前景广阔。
In view of the fact that the detection efficiency of detectors used in neutron logging in our country can not meet the practical application, we use ~ (241) Am-Be neutron source and LaBr_3: Ce detector to detect H and C in a radioisotope neutron test well of PetroChina Company , Fe and other crustal elements were measured and compared with the conventional Bismuth Germanium Oxide (BGO) detector used in current logging. A comparison of the measured energy spectrum results shows that the LaBr_3: Ce detector has a higher energy resolution than the BGO detector for crustal element measurements and the BG peak is very weak for the BGO detector under the same external test conditions. Therefore, the market prospect of further applying LaBr_3: Ce detectors to logging wells is promising.