D-D中子孔隙度测井泥质影响及校正研究  

Lithology affects and correction of neutron porosity logging using D-D source

作　　者：张丽[1,3] 韩笑 于华伟 贾文宝[3] 耿学森[1] ZHANG Li;HAN Xiao;YU Huawei;JIA Wenbao;GENG Xuesen(College of Resources,Shandong University of Science and Technology,Taian 271019,China;School of Geosciences,China University of Petroleum,Qingdao 266580,China;School of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)

机构地区：[1]山东科技大学资源学院,泰安271019 [2]中国石油大学(华东)地球科学与技术学院,青岛266580 [3]南京航空航天大学材料科学与技术学院,南京211106

出　　处：《核技术》2022年第5期41-48,共8页Nuclear Techniques

基　　金：国家自然科学基金(No.41704113、No.41674129);山东省重点研发项目(No.2019GSF109047);中国博士后基金项目(No.2019M661912);山东省高校科研计划项目(No.J18KA190、No.J18KA128)资助。

摘　　要：可控源替代同位素中子源进行中子孔隙度测井是核测井发展的必然趋势。为了提高可控D-D源中子孔隙度测井的可行性及测量精度,本文对D-D源中子孔隙度测井中泥质影响进行分析。首先利用蒙特卡罗模拟,对比分析三种源(^(241)Am-Be源、D-T源、D-D源)中子孔隙度测井过程中泥页岩响应;然后通过改变D-D源中子孔隙度测井中近、远源距位置,优选出D-D源的源距组合,重点分析通过改变源距的方式弱化泥页岩的影响。研究表明:D-D源和^(241)Am-Be源的泥页岩响应规律比较接近,当D-D源的源距设计相比于^(241)Am-Be源更近即采用25~45 cm的源距组合时,D-D源中子孔隙度测井中泥页岩影响与^(241)Am-Be源接近程度最高。虽然源距组合的改变不能使D-D源与^(241)Am-Be源的泥页岩响应完全一致或者彻底消除泥质影响,但这种较高程度趋近为D-D源中子孔隙度测井中泥页岩校正提供了思路,也为今后测井仪器中放射源的可兼容替代有一定的应用意义。[Background]It is an inevitable trend in nuclear logging to use controllable source instead of isotopic neutron source for neutron porosity logging.[Purpose]This study aims to improve the feasibility and measurement accuracy of controllable D-D source neutron porosity logging by analyzing,the influence of mud on D-D source neutron porosity logging.[Methods]Firstly,the response of mudstone in neutron porosity logging of three sources(^(241)Am-Be radioactive source,D-T source and D-D source)was compared and analyzed by Monte Carlo simulation method.Then,by changing the near and far source distance in D-D source neutron porosity logging,the source distance combination of D-D source was optimized to weaken the influence of shale by changing the source distance.[Results]Analysis results show that the mudstone response characteristics of D-D source and ^(241)Am-Be radioactive source are relatively close. When the source distance design of D-D source is closer to ^(241)Am-Be, i. e., the source distance combination of 25~45 cm is adopted, the mudstone influence in D-D source neutron porosity logging shows the highest degree of proximity to that of ^(241)Am-Be radioactive source. [Conclusions] Although the change of source spacing combination can not make the mudstone response of D-D source and ^(241)Am-Be radioactive source completely consistent or completely eliminate the influence of argillaceous matter, this high degree of convergence provides an idea for mudstone correction in D-D source neutron porosity logging and has certain application significance for the compatible substitution of radioactive sources in logging instruments in the future.

关 键 词：D-D源 ^(241)Am-Be源 中子孔隙度测井 源距组合 泥质影响 

分 类 号：P631.81[天文地球—地质矿产勘探]