氘-氘和氘-氚随钻中子孔隙度测井探测特性对比  

Comparison of D-T and D-D accelerator investigation characteristics in pulsed neutron porosity logging while drilling

作　　者：于华伟[1] 孙建孟[1] 杨锦舟[2] 

机构地区：[1]中国石油大学地球资源与信息学院,山东东营257061 [2]胜利油田钻井工艺研究院,山东东营257000

出　　处：《中国石油大学学报（自然科学版）》2009年第6期41-45,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家'863'高技术研究发展计划项目(2006AA060105);中国石油大学(华东)优秀博士学位论文培育项目(B2009-13)

摘　　要：为考察在随钻中子孔隙度测井中用氘-氘(D-D)脉冲源替代氘-氚(D-T)源的可行性,利用蒙特卡罗模拟方法,对比分析使用两种脉冲源时测井仪器的热中子空间分布、零源距区域、地层孔隙度灵敏度以及探测深度等探测特性。研究结果表明,D-D与D-T源相比,虽然在水平或大斜度井段对地层界面的分辨能力稍低一点,但是两者的零源距区的上限值、近源距和探测深度都大致相等,且D-D源对地层孔隙度的灵敏度更高、使用时更安全,在随钻脉冲中子孔隙度测井中可以得到更好的使用。In order to study the feasibility of using Deuterium-Deuterium （D-D） accelerator to replace Deuterium-Tritium （D-T） accelerator in logging-while-drilling （LWD） neutron porosity logging, the investigation characteristics for D-T and D- D accelerators in LWD neutron porosity logging were compared by Monte Carlo simulation method. The thermal neutron spa- tial distribution, critical detector-source spaces, formation porosity sensitivity and investigation depths of two sources were obtained. The results show that D-D source has the slightly lower resolution to formation interface in horizontal or deviated well than D-T source, but the max value of critical detector-source spaces, near source space or investigation depths of two sources were approximately equal respectively. Moreover, both the formation porosity sensitivity and safety of D-D source are significantly higher. Therefore, D-D source could be better used in LWD neutron porosity logging.

关 键 词：随钻测井 脉冲中子孔隙度测井 氘-氘(D-D) 氘-氚(D-T) 探测特性 

分 类 号：P631.817[天文地球—地质矿产勘探]