| 摘要: |
| 为考察在随钻中子孔隙度测井中用氘KD-D)脉冲源替代氘"M(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。 |
| 关键词: 随钻测井；脉冲中子孔隙度测井；氘KD-D) 氘-氚(D-T) 探测特性 |
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| 基金项目: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) |
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| Comparison of D-T and D-D accelerator investigation characteristics in pulsed neutron porosity logging while drilling |
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YU Hua-wei1,SUN Jian-meng1,YANG Jin-zhou2
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(1. College of Geo-Resources and Information in China University of Petroleum, Dongying 257061, Chirm ;2. Drilling Technology Research Institute, Shengli Oilfield，Dongying 257000, China)
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| Abstract: |
| 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 spatial 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. |
| Key words: logging-while-drilling (LWD) pulsed neutron porosity logging Deuterium-Deuterium ( D-D) Deuterium-Trit-ium ( D-T) investigation characteristics |
