温度对多孔介质核磁共振响应的影响  

Effect of temperature on NMR response of porous media

作　　者：王猛[1] 董宇 刘建新 刘海波[1] 刘志杰 李轩 WANG Meng;DONG Yu;LIU JianXin;LIU HaiBo;LIU ZhiJie;LI Xuan(China Oilfield Services Limited,Langfang 065201,China;CNOOC China Limited,Shanghai Branch,Shanghai 200335,China)

机构地区：[1]中海油田服务股份有限公司,廊坊065201 [2]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《地球物理学进展》2025年第1期243-254,共12页Progress in Geophysics

基　　金：中国海洋石油集团有限公司科技攻关项目“测录试关键技术与装备”(KJGG-2022-1401)资助.

摘　　要：井下高温高压环境会引起核磁共振弛豫谱的明显变化,导致基于常温常压状态下建立的方法和模型在实际地层评价中失去作用.为研究温度对多孔介质核磁共振响应的影响,按不同渗透率、不同孔隙度、不同泥质含量制造了8类人造砂岩岩心,分别开展100%饱含水、饱含油以及饱和油水两相的核磁共振变温压实验.不同温压状态测量的核磁共振弛豫谱形态对比表明,压力对多孔介质核磁共振响应几乎没有影响,温度对弛豫时间的影响与孔隙介质的润湿性有关,且短弛豫峰受温度的影响要远小于长弛豫峰.并通过统计总结不同状态下测量的岩心核磁孔隙度变化规律,推导了核磁孔隙度温度校正公式,确定了砂岩饱和油、水状态下的孔隙度校正模型.The high temperature and high pressure environment will cause significant changes in the Nuclear Magnetic Resonance(NMR)relaxation spectrum,which makes the methods and models based on the normal temperature and pressure state ineffective in the actual formation evaluation.In order to study the effect of temperature on the NMR response of porous media,eight types of artificial sandstone cores with different permeability,porosity,and shale content were manufactured,and NMR temperature-pressure experiments were conducted with 100%water saturation,oil saturation,and saturated oil-water two-phase conditions,respectively.The comparison of the NMR relaxation spectrum shapes measured under different temperature-pressure conditions indicates that pressure has little effect on the NMR response of porous media,while the effect of temperature on relaxation time is related to the wettability of the porous media,and the short relaxation peak is much less affected by temperature than the long relaxation peak.By statistically summarizing the variation patterns of core NMR porosity measured under different conditions,a temperature correction formula for NMR porosity was derived,and the porosity correction model under saturated oil and water state is determined.

关 键 词：核磁共振 多孔介质 变温变压实验 弛豫 孔隙度校正 

分 类 号：P631[天文地球—地质矿产勘探]