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1、脉冲中子双伽马谱饱和度测井方法及数值模拟研究第53卷第1O期2010年10月地球物理CHINESEJOURNALOFGEOPHYSICSVo1.53,No.100ct.,2O10张锋,袁超,王新光.脉冲中子双伽马谱饱和度测井方法及数值模拟研究.地球物理,2010,53(10):2527～2533,DOI:10.3969/j.issn.00015733.2010.10.026ZhangF,YuanC,WangXG.Studyonthedualgammaspectrumsaturationloggingmethodbasedonpulsedn
2、eutronSOureeandnumericalsimulation.ChineseJ.Geophys.(inChinese),2010,53(10):2527～2533,DOI:10.3969/j.issn.0001—5733.2010.10.026脉冲中子双伽马谱饱和度测井方法及数值模拟研究张锋,袁超,王新光中国石油大学(华东)地球资源与信息学院,青岛266555摘要脉冲中子双伽马谱饱和度测井方法是利用特定的脉冲和测量时序设计,采用远,近伽马探测器记录非弹性散射和俘获伽马能谱以及伽马射线时间谱,通过获取C/O和地层宏观俘获截面等信息来
3、确定地层含油饱和度.采用大直径仪器和BG0晶体探测器时,其采集的非弹性散射和俘获伽马能谱计数统计性优于国外仪器,重复脉冲发射中子后伽马射线时间谱仍满足指数衰减规律,且能使伽马射线时间谱的道计数累积,计数统计性好于常规中子寿命测井,得到的地层宏观俘获截面与单脉冲发射近似相同.在地层孔隙度未知的情况下,利用c/o和地层宏观俘获截面交会技术可以定量确定含油饱和度.关键词脉冲中子,双伽马谱,c/o,地层宏观俘获截面,蒙特卡罗模拟ix)i:10.3969/j.issrL000l一5733.2010.10.026中图分类号P631收稿日期200912
4、—31,2010-07—29收修定稿StudyonthedualgammaspectrumsaturationloggingmethodbasedonpulsedneutronsourceandnumericalsimulationZHANGFeng,YUANChao.WANGXin—GuangCollegeofGeo—ResourcesattdInrmation,ChinaUniversityofPetroleum(EastChina),Qingdao266555,ChinaAbstractThedualgammaspectrumsat
5、urationloggingbasedonpulsedneutronsourceisanewtechnologythatcanatthesametimerecordinelasticscatteringandcapturegammarayspectra,alongwithgammaraytimespectrumatthefarandneargammaraydetectorbymeansofaspecialpulseandmeasurementtimingdesign.Itisfoundthatcountingstatisticsofine
6、lasticscatteringandcapturegammarayissuperiortoforeigninstrumentsbyusinglarge—diameterinstrumentandBGOcrystaldetector.ThegammaraytimespectrumafterrepeatedpulseneutronemissionstillmeetstheexponentialdecayIaw.andthechannelcountofgammaraytimespectrumiscumulated,SOitscountings
7、tatisticsisbetterthanconventionalneutronlifetimelogging.Inaddition,themacroscopicabsorptioncrosssectionobtainedbythispulseandmeasuretimingisnearlythesameasthesinglepulse.Itisfoundthattheoilsaturationcartbedeterminedwiththecross—plottechnologyofC/Oandformationmacroscopicab
8、sorptioncrosssectionundertheconditionofunknownformationporosity.KeywordsPulsedneutron,Dualgammas
