提高泥质束缚水测量精度的核磁共振测井技术  

NMR Logging Technology for Improving the Measurement Accuracy of Mud Bound Water

作　　者：朱万里 靳敏刚 姜曼 张娟 陈玉杰 李圣均 宋宇 ZHU Wanli;JIN Mingang;JIANG Man;ZHANG Juan;CHEN Yujie;LI Shengjun;SONG Yu(China Petroleum Logging CO.LTD.,Xi’an,Shaanxi 710077,China;CNPC Logging Test Base,Xi’an,Shaanxi 710077,China)

机构地区：[1]中国石油集团测井有限公司,陕西西安710077 [2]中国石油天然气集团有限公司测井试验基地,陕西西安710077

出　　处：《测井技术》2019年第6期574-577,共4页Well Logging Technology

基　　金：中国石油天然气集团项目“偏心核磁共振测井仪研制与优化”(2019B-3708);国家重大专项“随钻核磁共振测井关键技术”(2017ZX05019002-005)

摘　　要：核磁共振测井,由于磁场强度低、样品体积小等原因,导致测量结果具有不确定性,存在于不可动孔隙、弛豫快的泥质束缚水更是难以准确测量.描述了泥质束缚水的核磁共振测量方法,分析射频脉冲方式对核磁共振测量的影响,通过数值模拟创新设计了复合射频脉冲技术.试验结果表明,该技术提高了仪器信噪比,T2谱能够准确反映地层信息.应用该技术可提高泥质束缚水测量精度,对低孔隙度低渗透率储层、束缚水引起的低饱和度储层等复杂油气藏勘探具有重要意义.NMR logging result is uncertain because the magnetic field in the well logged is low and the sample is small.If there are immovable pores and mud bound water with fast relaxation,it is very difficult to get accurate data.This paper describes the NMR logging method for mud bound water,analyzes how radio frequency(RF)pulse influences NMR data,and finally provides a composite RF pulse technology based on numerical simulation.Test results show that the technology can improve the signal-to-noise ratio of the logging tool,and T 2 spectra can accurately reflect formation information.This technology can improve the measurement accuracy of mud bound water.It is of great significance to the exploration of complex reservoirs such as low-porosity and low-permeability reservoirs and low-saturation reservoirs caused by bound water.

关 键 词：核磁共振测井 泥质束缚水 信噪比 射频脉冲 低孔隙度 低渗透率 低饱和度 数值模拟 

分 类 号：P631.84[天文地球—地质矿产勘探]