核磁共振测井仪软硬脉冲时序设计与应用  

Design and Application of Softhard Pulse Timing for NMR Logging Tools

作　　者：钟剑 朱万里[1,2] 侯学理 师光辉[1,2] 赵创 刘瀚檐[1,2] 马赛麟 ZHONG Jian;ZHU Wanli;HOU Xueli;SHI Guanghui;ZHAO Chuang;LIU Hanyan;MA Sailin(China Petroleum Logging CO. LTD., Xi’an, Shaanxi 710077, China;CNPC Well Logging Laboratory, Xi’an, Shaanxi 710077, China)

机构地区：[1]中国石油集团测井有限公司技术中心,陕西西安710077 [2]中国石油天然气集团公司测井实验基地,陕西西安710077

出　　处：《测井技术》2020年第2期165-167,177,共4页Well Logging Technology

基　　金：中国石油天然气集团公司科学研究与技术开发项目“iMRT核磁共振测井仪研制与优化”(2019B-3708);中国石油天然气集团公司重大工程技术现场试验项目“175 ℃/140 MPa成像测井装备现场试验”(2017F-16)。

摘　　要：为改善核磁共振测井仪泥质束缚水测量效果,基于软硬脉冲原理,建立软硬脉冲型调幅信号模型,设计一种软硬脉冲时序。基于Microsemi Libero SoC v11.8软件开发平台,采用Verilog语言实现仪器软硬脉冲型调幅数据模块和载波数据模块;借助软件开发平台上的Modelsim仿真模块进行功能仿真。软硬脉冲时序设计程序,功能仿真满足核磁共振测井仪工作要求。经测井对比分析,软硬脉冲时序测量的泥质束缚水孔隙度重复性优于硬脉冲型时序。软硬脉冲时序能够有效改善泥质束缚水孔隙度测量效果。A soft-hard pulse model for signal amplitude modulation is established,and a soft-hard pulse timing is designed to improve the measurement of mud bound water by NMR logging tools.On the Microsemi Libero SoC v11.8(a software platform),there equips with a soft-hard pulse amplitude-modulating module and a wave-carrying module based on the Verilog language;and the Modelsim module is used for data simulation.The program of soft-hard pulse timing and the functional simulation meet the requirements of NMR logging tools.Logging comparison and analysis proves that the porosity repeatability of mud bound water measured by the soft-hard pulse timing is better than that by hard pulse timing.The soft-hard pulse timing can effectively improve the measurement of the porosity of mud bound water.

关 键 词：核磁共振测井 软硬脉冲 时序设计 频率特性 泥质束缚水 

分 类 号：P631.83[天文地球—地质矿产勘探]